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Academic literature on the topic 'Pollutants and Bacteria'

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Published: 7 July 2024
Last updated: 7 July 2024

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Journal articles on the topic "Pollutants and Bacteria":

1

Shahid, Munazzam Jawad, Ameena A. AL-surhanee, Fayza Kouadri, Shafaqat Ali, Neeha Nawaz, Muhammad Afzal, Muhammad Rizwan, Basharat Ali, and Mona H. Soliman. "Role of Microorganisms in the Remediation of Wastewater in Floating Treatment Wetlands: A Review." Sustainability 12, no. 14 (July 10, 2020): 5559. http://dx.doi.org/10.3390/su12145559.

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This article provides useful information for understanding the specific role of microbes in the pollutant removal process in floating treatment wetlands (FTWs). The current literature is collected and organized to provide an insight into the specific role of microbes toward plants and pollutants. Several aspects are discussed, such as important components of FTWs, common bacterial species, rhizospheric and endophytes bacteria, and their specific role in the pollutant removal process. The roots of plants release oxygen and exudates, which act as a substrate for microbial growth. The bacteria attach themselves to the roots and form biofilms to get nutrients from the plants. Along the plants, the microbial community also influences the performance of FTWs. The bacterial community contributes to the removal of nitrogen, phosphorus, toxic metals, hydrocarbon, and organic compounds. Plant–microbe interaction breaks down complex compounds into simple nutrients, mobilizes metal ions, and increases the uptake of pollutants by plants. The inoculation of the roots of plants with acclimatized microbes may improve the phytoremediation potential of FTWs. The bacteria also encourage plant growth and the bioavailability of toxic pollutants and can alleviate metal toxicity.
2

Guo, Baoyou, Baolei Liu, Jun Chen, Chuan Jing, Ming Zhong, and Qi Shan. "Prospect Research on the Diversity of Extracellular Mineralization Process Induced by Mineralizing Microorganisms and Its Use as a Treatment for Soil Pollutants." Sustainability 15, no. 6 (March 9, 2023): 4858. http://dx.doi.org/10.3390/su15064858.

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Microbial-induced mineralization is a process in which metal ions in the environment are processed by microorganisms, forming deposits of crystals with cementing and void-filling functions. Cementing crystals can fix metal ions, reduce permeability, improve soil strength, and play a positive role in soil remediation and pollution control. This paper first introduces the principle of microbial-induced mineralization and analyzes its mechanism of action in the treatment of soil organic and inorganic pollutants. Then, the mineralization principle of different types of mineralized bacteria in soil (fungal metabolism involving organic acid complexation and metabolic urease catalysis, sulfur oxidation by sulfur-oxidizing bacteria, dissimilatory sulfate reduction by sulfate-reducing bacteria, ammonification by ammoniating bacteria, reverse digestion by denitrifying bacteria, urease catalysis by urease-producing bacteria, acetic acid fermentation by methanogenic bacteria, and H2/CO2 reduction) is elaborated, the influencing factors in the treatment of soil pollutants by mineralization technology in practical application are analyzed, and the current status of mineralization treatment for different types of pollutants is summarized. Finally, the future prospects of soil pollutant treatment are outlined to promote research into microbial-induced mineralization technology for the treatment of soil pollutants.
3

Wu, Yichao, Anee Mohanty, Wu Siang Chia, and Bin Cao. "Influence of 3-Chloroaniline on the Biofilm Lifestyle of Comamonas testosteroni and Its Implications on Bioaugmentation." Applied and Environmental Microbiology 82, no. 14 (May 13, 2016): 4401–9. http://dx.doi.org/10.1128/aem.00874-16.

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ABSTRACTBioaugmentation has been frequently proposed in wastewater and soil treatment to remove toxic aromatic compounds. The performance of bioaugmentation is affected by a number of biological and environmental factors, including the interaction between the target pollutant and the augmented bacterial cells. In this study, usingComamonas testosteroniand 3-chloroaniline (3-CA) as the model organism and target pollutant, we explored the influence of toxic aromatic pollutants on the biofilm lifestyle of bacteria capable of degrading aromatic compounds toward a better understanding of cell-pollutant interaction in bioaugmentation. Our results showed that the exposure to 3-CA greatly reduced the retention ofC. testosteronicells in packed-bed bioreactors (from 22% to 15% after three pore volumes), which could be attributed to the altered bacterial motility and cell surface hydrophobicity. To further understand the molecular mechanisms, we employed an integrated genomic and transcriptomic analysis to examine the influence of 3-CA on the expression of genes important to the biofilm lifestyle ofC. testosteroni. We found that exposure to 3-CA reduced the intracellular c-di-GMP level by downregulating the expression of genes encoding c-di-GMP synthases and induced massive cell dispersal from the biofilms. Our findings provide novel environmental implications on bioaugmentation, particularly in biofilm reactors, for the treatment of wastewater containing recalcitrant industrial pollutants.IMPORTANCEBioaugmentation is a bioremediation approach that often has been described in the literature but has almost never been successfully applied in practice. Many biological and environmental factors influence the overall performance of bioaugmentation. Among these, the interaction between the target pollutant and the augmented bacterial cells is one of the most important factors. In this study, we revealed the influence of toxic aromatic pollutants on the biofilm lifestyle of bacteria capable of degrading aromatic compounds toward a better understanding of cell-pollutant interaction in bioaugmentation. Our findings provide novel environmental implications on bioaugmentation for the treatment of wastewater containing recalcitrant industrial pollutants; in particular, the exposure to toxic pollutants may reduce the retention of augmented organisms in biofilm reactors by reducing the c-di-GMP level, and approaches to elevating or maintaining a high c-di-GMP level may be promising to establish and maintain sustainable bioaugmentation activity.
4

Khalid, Farah Eryssa, Zheng Syuen Lim, Suriana Sabri, Claudio Gomez-Fuentes, Azham Zulkharnain, and Siti Aqlima Ahmad. "Bioremediation of Diesel Contaminated Marine Water by Bacteria: A Review and Bibliometric Analysis." Journal of Marine Science and Engineering 9, no. 2 (February 3, 2021): 155. http://dx.doi.org/10.3390/jmse9020155.

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Oil pollution can cause tremendous harm and risk to the water ecosystem and organisms due to the relatively recalcitrant hydrocarbon compounds. The current chemical method used to treat the ecosystem polluted with diesel is incompetent and expensive for a large-scale treatment. Thus, bioremediation technique seems urgent and requires more attention to solve the existing environmental problems. Biological agents, including microorganisms, carry out the biodegradation process where organic pollutants are mineralized into water, carbon dioxide, and less toxic compounds. Hydrocarbon-degrading bacteria are ubiquitous in the nature and often exploited for their specialty to bioremediate the oil-polluted area. The capability of these bacteria to utilize hydrocarbon compounds as a carbon source is the main reason behind their species exploitation. Recently, microbial remediation by halophilic bacteria has received many positive feedbacks as an efficient pollutant degrader. These halophilic bacteria are also considered as suitable candidates for bioremediation in hypersaline environments. However, only a few microbial species have been isolated with limited available information on the biodegradation of organic pollutants by halophilic bacteria. The fundamental aspect for successful bioremediation includes selecting appropriate microbes with a high capability of pollutant degradation. Therefore, high salinity bacteria are remarkable microbes for diesel degradation. This paper provides an updated overview of diesel hydrocarbon degradation, the effects of oil spills on the environment and living organisms, and the potential role of high salinity bacteria to decontaminate the organic pollutants in the water environment.
5

Yanuar, Adi Tiya, Abd Aziz Amin, Lutfi Ni'matus Salamah, Frentina Murty Sujadi, Ekwan Nofa Wiratno, Citra Satrya Utama Dewi, and Andi Kurniawan. "Oxygenase Enzyme Activity and Compound Profile in Hydrocarbon Bioremediation by Pseudomonas aeruginosa and Rhodococcus erythropolis Consortium." Jurnal Ilmiah Perikanan dan Kelautan 16, no. 1 (December 20, 2023): 106–18. http://dx.doi.org/10.20473/jipk.v16i1.45528.

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Abstract Hydrocarbon contamination is one of the most significant environmental problems, including in the marine environment. Several methods, such as chemical and physical remediation, have been constructed to remediate pollutants but remain side effects and have a relatively high cost. Bioremediation is an alternative method for degrading contaminants due to its eco-friendliness and low cost. During bioremediation, the enzyme oxygenase is produced by bacteria to degrade pollutants. However, the oxygenation enzyme's activity and compound profile during this bioremediation process are still sparsely explored. This study aimed to analyze oxygenation enzyme activity and compound profiles during the hydrocarbon bioremediation process by bacterial consortia of Pseudomonas aeruginosa and Rhodococcus erythopolis. The materials of this research were the oxygenase enzyme activity, compound profile, and amount of BOD and COD during the bioremediation process. The results showed that the monooxygenase enzyme has activity between 0.257 and 3.859 U/mL. Meanwhile, the dioxygenase enzyme has activity between 0.579 and 5.402 U/mL. The final incubation compound profile found that Hexadecanoic acid methyl ester (C17H34O2) decreased by up to 47.66%. Moreover, BOD and COD reductions were 68.59% and 67.51%, respectively. This study concluded that oxygenation enzymes were produced to degrade pollutant compounds during the hydrocarbon bioremediation process. Further research is needed to improve the effectiveness of bioremediation by enhancing enzyme activity. Highlight Research The potential of hydrocarbon-degrading bacteria (Rhodococcus erythropolis and Pseudomonas aeruginosa) for pollutant degradation in the marine environment. Enzyme activity of hydrocarbon-degrading bacteria and degradation profile of pollutants. The dynamics of BOD and COD during the bioremediation process.
6

Pittino, Francesca, Roberto Ambrosini, Roberto Azzoni, Guglielmina Diolaiuti, Sara Villa, Isabella Gandolfi, and Andrea Franzetti. "Post-Depositional Biodegradation Processes of Pollutants on Glacier Surfaces." Condensed Matter 3, no. 3 (August 11, 2018): 24. http://dx.doi.org/10.3390/condmat3030024.

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Glaciers are important fresh-water reservoirs for our planet. Although they are often located at high elevations or in remote areas, glacial ecosystems are not pristine, as many pollutants can undergo long-range atmospheric transport and be deposited on glacier surface, where they can be stored for long periods of time, and then be released into the down-valley ecosystems. Understanding the dynamics of these pollutants in glaciers is therefore important for assessing their environmental fate. To this aim, it is important to study cryoconite holes, small ponds filled with water and with a layer of sediment, the cryoconite, at the bottom, which occur on the surface of most glaciers. Indeed, these environments are hotspots of biodiversity on glacier surface as they host metabolically active bacterial communities that include generalist taxa able to degrade pollutants. In this work, we aim to review the studies that have already investigated pollutant (e.g., chlorpyrifos and polychlorinated-biphenyls (PCBs)) degradation in cryoconite holes and other supraglacial environmental matrices. These studies have revealed that bacteria play a significant role in pollutant degradation in these habitats and can be positively selected in contaminated environments. We will also provide indication for future research in this field.
7

MARINESCU, Mariana, Anca LACATUSU, Eugenia GAMENT, Georgiana PLOPEANU, and Vera CARABULEA. "Bioremediation Potential of Native Hydrocarbons Degrading Bacteria in Crude Oil Polluted Soil." Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca. Agriculture 74, no. 1 (May 19, 2017): 19. http://dx.doi.org/10.15835/buasvmcn-agr:12654.

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Bioremediation of crude oil contaminated soil is an effective process to clean petroleum pollutants from the environment. Crude oil bioremediation of soils is limited by the bacteria activity in degrading the spills hydrocarbons. Native crude oil degrading bacteria were isolated from different crude oil polluted soils. The isolated bacteria belong to the genera Pseudomonas, Mycobacterium, Arthrobacter and Bacillus. A natural biodegradable product and bacterial inoculum were used for total petroleum hydrocarbon (TPH) removal from an artificial polluted soil. For soil polluted with 5% crude oil, the bacterial top, including those placed in the soil by inoculation was 30 days after impact, respectively 7 days after inoculum application, while in soil polluted with 10% crude oil, multiplication top of bacteria was observed in the determination made at 45 days after impact and 21 days after inoculum application, showing once again how necessary is for microorganisms habituation and adaptation to environment being a function of pollutant concentration. The microorganisms inoculated showed a slight adaptability in soil polluted with 5% crude oil, but complete inhibition in the first 30 days of experiment at 10% crude oil.
8

RS, Ankhy, SJ Proma, N. Ahsan, F. Jeba, MS Islam, and A. Salam. "Multi-Drugs Resistant Bacteria Associated Particulate Matter In The Ambient Atmosphere of Dhaka, Bangladesh." Journal of Biodiversity Conservation and Bioresource Management 7, no. 2 (June 30, 2022): 1–12. http://dx.doi.org/10.3329/jbcbm.v7i2.60145.

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Nowadays, air pollution is confined to the level of air pollutants and bio-aerosols since it might be pathogenic or induce allergic reactions. The research was carried out to discover the bacteria associated with suspended particulate matter in indoor and outdoor air, as well as to investigate their antibiotic susceptibility. The results revealed that the extent of outdoor air pollutants (i.e., PM2.5, PM10, HCHO, and TVOC) was significantly higher (p< 0.01) than the extent of indoor air pollutants. Culturing the sample filter paper in Nutrient Agar (NA) media at two different temperatures, 25°C and 37°C, allowed us to measure the quantity of bacteria in the air. The concentration of bacteria was 622±22 CFUm-3 at 26±2°C and 11±2 CFUm-3 at 20±2°C in both outdoor and indoor air, respectively. Positive Bacillus, Micrococcus luteus, Pseudomonas stutzeri and Brevundimonas diminuta bacteria were identified. All of the identified bacteria were found to be pathogenic. Moreover, some of the identified bacteria showed resistance to some commercially available antibiotics, such as Cefixime, Ceftazimidine, Nalidixic acid, Ampicillin, Ciprofloxacin, Gentamycin, etc. The positive correlation between fine particles and the bacterial concentration (R2= 0.75 for indoor and R2= 0.68 for outdoor air) revealed that the bacteria were highly associated with fine particles than coarse particles. Furthermore, the number and growth of bacteria were affected by the meteorological parameters (i.e., temperature and relative humidity). The rise in relative humidity favoured the increase in bacterial concentration. Therefore, the risk of being affected by bioaerosol is higher in the wet season than that of the dry season. J. Biodivers. Conserv. Bioresour. Manag. 2021, 7(2): 1-12
9

Kuiper, Irene, Ellen L. Lagendijk, Guido V. Bloemberg, and Ben J. J. Lugtenberg. "Rhizoremediation: A Beneficial Plant-Microbe Interaction." Molecular Plant-Microbe Interactions® 17, no. 1 (January 2004): 6–15. http://dx.doi.org/10.1094/mpmi.2004.17.1.6.

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Worldwide, contamination of soil and ground water is a severe problem. The negative effects of pollutants on the environment and on human health are diverse and depend on the nature of the pollution. The search for alternative methods for excavation and incineration to clean polluted sites resulted in the application of bioremediation techniques. In this review, we describe some generally accepted bioremediation tools and subsequently focus on the combination of two approaches, phytoremediation and bioaugmentation, resulting in rhizoremediation. During rhizoremediation, exudates derived from the plant can help to stimulate the survival and action of bacteria, which subsequently results in a more efficient degradation of pollutants. The root system of plants can help to spread bacteria through soil and help to penetrate otherwise impermeable soil layers. The inoculation of pollutant-degrading bacteria on plant seed can be an important additive to improve the efficiency of phytoremediation or bioaugmentation.
10

Harpaz, Dorin, Robert S. Marks, Ariel Kushmaro, and Evgeni Eltzov. "Environmental pollutants induce noninherited antibiotic resistance to polymyxin B in Escherichia coli." Future Microbiology 15, no. 17 (November 2020): 1631–43. http://dx.doi.org/10.2217/fmb-2020-0172.

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Aim: The mechanisms behind antibiotic resistance by bacteria are important to create alternative molecules. Objective: This study focuses on the impact of environmental pollutants on bacterial resistance to antibiotics. Materials & methods: The effect of various environmental pollutants on noninherited bacterial resistance to antibiotics was examined. Results: The tolerance to the polymyxin-B antibiotic was shown to be conferred to Escherichia coli, by pretreatment with subinhibitory concentrations of environmental toxicants. The cell survival to a sublethal dosage of antibiotics was tested. Exposure to low concentrations of toxic compounds (500 ppb copper, 2% [v/v] ethanol or 0.5 μg/ml trimethoprim) stimulated the bacterial heat shock systems and led to increased tolerance to polymyxin B. Conclusion: Environmental pollutants induce a temporary bacterial noninheritable resistance to antibiotic.
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Journal articles Dissertations / Theses Books

Dissertations / Theses on the topic "Pollutants and Bacteria":

1

Lam, Shirley. "Effect of sulphate on the anaerobic degradation of organic pollutants (benzoate) /." Hong Kong : University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13813523.

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Sarin, Charoon. "A lux-based bioassay of heavy metal contamination of organic wastes." Thesis, University of Aberdeen, 2000. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU123515.

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The luxCDABE genes (i.e. full cassette) were inserted into the bacterial strain used in this study, E. coli HB101, using a multi copy plasmid, (pUCD607). A number of experiments were carried out in this thesis to study the potential of using the biosensor, E. coli HB101 (pUCD607), for ecotoxicity testing. Growth and bioluminescence of E. coli HB101 (pUCD607) were characterised and optimised, as well as the stability of this biosensor to a range of environmental parameters. The biosensors were found to be sensitive to a range of pollutants and provided a highly consistent bioluminescence response under conditions likely to be encountered in environmental toxicity testing. Assessment of the potential of the lux-based bioassay for revealing the combination of toxicities of metals was carried out. This is necessary because samples in ecotoxicity testing may contain a number of types of pollutants. The biosensors showed high sensitivity of response to mixed metals and identified the combined toxicity of the mixture. Biosensor bioluminescence could also be used to diagnose the distinction between toxicity after 15 and 30 minutes exposure. Results suggested that exposure time is an important factor affecting on the toxicity of metals in mixtures. The results from challenging lux-based biosensors with heavy metals with various concentration of Cl- demonstrated the effect of Cl- ion complex formation for metals on the bioluminescence of E. coli HB101 (pUCD607). The bioluminescence response of the biosensor also related to the results from computer modelling (GEOCHEM) and was used to diagnose the effect of Cl- on metal toxicity. The results showed that E. coli HB101 (pUCD607) is sensitive to complexes of metals such as are formed by Cl- ion. Immobilised cells of E. coli HB101 (pUCD607) were used to investigate the toxicity of metals, both singly and in mixture. This work aimed to assess the potential of immobilised cells, as an alternative form of biosensor, for use in ecotoxicity testing. Bioluminescence response of immobilised cells varied with the test solution pH and showed that it has great potential for use in low pH environments. Immobilised cell biosensors demonstrated sufficient sensitivity to identify the toxicity of individual and mixed metals. High levels of bioluminescence of immobilised cells lasted up to 5 hours after bead production, suggesting that biosensor immobilisation increases the flexibility of the toxicity assay.
3

Ricart, Viladomat Marta. "Effects of priority and emerging pollutants on river biofilms." Doctoral thesis, Universitat de Girona, 2011. http://hdl.handle.net/10803/7881.

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L'activitat humana representa una de les majors causes d'entrada d'una gran varietat de substàncies en els ecosistemes fluvials. L'objectiu principal d'aquest treball es investigar els efectes que els tòxics orgànics poden exercir en els biofilms fluvials. El riu Llobregat ha estat sotmès a fortes pressions, fet que l'ha portat a uns nivells molt elevats de contaminació. En aquest estudi s'ha observat una influència dels plaguicides presents al riu en la distribució de la comunitat de diatomees, així com efectes en el biofilm a nivell funcional i estructural. Experiments amb canals experimentals han mostrat que l'herbicida diuron i el bactericida triclosan poden ocasionar una cadena d'efectes en els biofilms, incloent efectes directes i també efectes indirectes en les relacions entre els components del biofilm. Experiments amb cultius algals han mostrat que aquests tòxics, aplicats en barreja, poden tenir una major toxicitat de la prevista pels models, resultant en efectes sinèrgics.
Human activity is responsible for the entrance of many substances to the aquatic environment. The main objective of this study is to investigate the effects of organic toxicants on fluvial biofilms. The river Llobregat has been submitted to urban, industrial and agricultural pressures, and as such is a highly contaminated river. The diatom community was influenced by the presence of pesticides. Effects on both biofilm function and structure were attributed to the pesticides. Laboratory experiments with experimental channels have shown that the herbicide diuron and the bactericide triclosan may cause a chain of effects on biofilms, which include direct effects and indirect effects on the relationship between biofilm components. Experiments with algal cultures have shown that these toxicants, applied in mixtures, can have higher toxicity than the toxicity predicted by models, resulting in synergistic effects.
4

Dale, Olivia R. "Detection, diversity, and activity on anaerobic ammonium oxidizing bacteria (Anammox) in the Cape Fear River Estuary /." Electronic version (PDF), 2007. http://dl.uncw.edu/etd/2007-1/r1/daleo/oliviadale.pdf.

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Straccia, Federico. "Interactions of plants and bacteria in PCB-Contaminated Soils - Natural Ways for removal of pollutants." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/1048/.

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DANELLI, SILVIA GIULIA. "Assessment of the impact of atmospheric pollutants on bacteria viability by an atmospheric simulation chamber." Doctoral thesis, Università degli studi di Genova, 2022. http://hdl.handle.net/11567/1073523.

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The aim of the PhD project was to make possible systematic studies of the bio-aerosols behavior in different atmospheric conditions, with the final goal to assess the link between pollution levels and bio-aerosol dispersion and impact. The research has been carried out at ChAMBRe (Chamber for Aerosol Modelling and Bio-aerosol Research), a 2.3 m3 stainless steel atmospheric simulation chamber. Experiments conducted inside confined artificial environments, such as the Atmospheric Simulations Chambers (ASCs), where atmospheric conditions and composition are controlled, can provide valuable information on bio-aerosols viability and their interaction with other atmospheric constituents. The first phase of the PhD project was dedicated to the characterization of the chamber, the related instrumentation and the design and development of the experimental set-up. An experimental protocol for chamber studies on bio-aerosols was developed and thoroughly tested with two bacteria model strains (B. subtilis and E. coli). An intense effort has been dedicated to fully characterize the performance of three different nebulization systems specifically designed for bioaerosol applications to assess their application in experiments at ASCs. A WIBS-NEO provides the size-segregated, real-time monitoring of the total bio-aerosol concentration inside the chamber. With a clean atmosphere maintained inside ChAMBRe, the ratio between injected and extracted viable bacteria turned out to be reproducible at 11 % and 13% level with E. coli and B. subtilis respectively. After assessing this way the reproducibility and sensitivity of the whole experimental procedure, the first tests to explore the possible correlation between bacteria viability and air quality were carried out. The two bacteria models, B. subtilis and E. coli, were subjected to high concentrations of nitrogen oxides and soot particles, two of the most common pollutants emitted by anthropogenic sources.
7

Aly, Hassan Ashraf. "Novel integrated scheme for destruction of hydrophobic hazardous air pollutants." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1282569687.

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8

Abu-Lail, Laila I. "An atomic force microscopy study of bacterial adhesion to natural organic matter-coated surfaces in the environment." Link to electronic thesis, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-050206-163823/.

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9

Marozava, Sviatlana [Verfasser], Rainer U. [Akademischer Betreuer] Meckenstock, and Wilfried F. M. [Akademischer Betreuer] Röling. "Insights into the microbial physiology of bacteria capable of degrading pollutants in contaminated groundwater ecosystems / Sviatlana Marozava. Gutachter: Rainer U. Meckenstock ; Wilfried F.M. Röling. Betreuer: Rainer U. Meckenstock." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1044680474/34.

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Turner, Nigel Laurence. "Toxicity fingerprinting of pollutants and environmental effluents using lux bacterial biosensors." Thesis, University of Aberdeen, 2001. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU145382.

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A constitutive lux-marked biosensor, E. coli HB101 pUCD607, was developed as a novel, acute, 'fingerprinting' technique by which individual pollutants, and whole effluents, could be identified and quantified. In this way, the advantages of both chemical analysis and toxicology were encompassed in one technique. An assay technique for obtaining temporal response curves was developed by injecting the biosensor into toxic samples, and then measuring luminescence continuously for 5 minutes. An algorithm was formulated, and implemented as a simple computer program, by which 'unknown' temporal response-curves could be compared against a database of 'reference' pollutant response-curves. Two different techniques were derived for analysing the output data; a binomial (yes or no) 'best-fit' technique, and a continuous 'comparative-fit' technique. These techniques were validated by 94% identification success for inter-comparisons of 7 pollutants, each at 5 concentrations, and 100% identification success of four pollutant spikes in three environmental samples. The technique was tested on three complex environmental effluents. Cu was identified as the main pollutant in a distillery effluent, and Zn the main pollutant in a metal processing effluent. Identification was successful despite the presence of complexing substrates and co-pollutants. The technique could also differentiate between three complex effluents and four artificial complex effluents without the need for actual pollutant identification. In conclusion, this technology can be used to 'fingerprint' any form of pollution that is bioavailable to the biosensor, without the need for prior knowledge of sample chemistry. This represents a potentially valuable tool for toxicity assessment and screening.
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Books on the topic "Pollutants and Bacteria":

1

Hallock, David. Lower Columbia River bi-State water quality program: Bacteria studies. Olympia, Wash. (P.O. Box 47710, Olympia 98504-7710): Environmental Investigations and Laboratory Services Program, Ambient Monitoring Section, Washington State Dept. of Ecology, 1993.

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Hallock, David. Lower Columbia River bi-State water quality program: Bacteria studies. Olympia, Wash: Environmental Investigations and Laboratory Services Program, Ambient Monitoring Section, Washington State Dept. of Ecology, 1993.

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3

Beskenis, Joan L. An examination of die-off of fecal coliform and fecal streptococci bacteria in the Ware River, 1985. Westborough, Mass: Massachusetts Dept. of Environmental Quality Engineering, Division of Water Pollution Control, Technical Services Branch, 1989.

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Obayashi, Alan W. Management of industrial pollutants by anaerobic processes. Chelsea, Mich: Lewis Publishers, 1985.

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Pelmont, Jean. Biodégradations et métabolismes: Les bactéries pour les technologies de l'environment. Les Ulis: EDP Science, 2005.

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Davis, Jerri V. Water-quality assessment of the Ozark Plateaus study unit, Arkansas, Kansas, Missouri, and Oklahoma: Nutrients, bacteria, organic carbon, and suspended sediment in surface water, 1993-95. Little Rock, Ark: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Davis, Jerri V. Water-quality assessment of the Ozark Plateaus study unit, Arkansas, Kansas, Missouri, and Oklahoma: Nutrients, bacteria, organic carbon, and suspended sediment in surface water, 1993-95. Little Rock, Ark: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Davis, Jerri V. Water-quality assessment of the Ozark Plateaus study unit, Arkansas, Kansas, Missouri, and Oklahoma: Nutrients, bacteria, organic carbon, and suspended sediment in surface water, 1993-95. Little Rock, Ark: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Davis, Jerri V. Water-quality assessment of the Ozark Plateaus study unit, Arkansas, Kansas, Missouri, and Oklahoma: Nutrients, bacteria, organic carbon, and suspended sediment in surface water, 1993-95. Little Rock, Ark: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Davis, Jerri V. Water-quality assessment of the Ozark Plateaus study unit, Arkansas, Kansas, Missouri, and Oklahoma: Nutrients, bacteria, organic carbon, and suspended sediment in surface water, 1993-95. Little Rock, Ark: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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Book chapters on the topic "Pollutants and Bacteria":

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Kaura, Sonia, Akansha Mathur, and Aakanksha Kalra. "Bacteria and Pollutants." In Modern Approaches in Waste Bioremediation, 339–64. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-24086-7_16.

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Sapkota, Amy R. "Other Water Pollutants: Antibiotic-Resistant Bacteria." In Water and Sanitation-Related Diseases and the Environment, 329–35. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118148594.ch26.

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Kumar, Vineet, and Ram Chandra. "Bacteria-Assisted Phytoremediation of Industrial Waste Pollutants and Ecorestoration." In Phytoremediation of Environmental Pollutants, 159–200. New York: CRC Press, 2017. http://dx.doi.org/10.4324/9781315161549-7.

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Ahemad, Munees, and Jawed Iqbal. "Phosphate-Solubilizing Bacteria as Plant Growth Promoters and Accelerators of Phytoremediation." In Phytoremediation of Environmental Pollutants, 227–44. New York: CRC Press, 2017. http://dx.doi.org/10.4324/9781315161549-9.

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Yadav, Sangeeta, and Ram Chandra. "Quorum Sensing and Siderophore Formation Mechanism of Rhizospheric Bacteria during Phytoremediation of Environmental Pollutants." In Phytoremediation of Environmental Pollutants, 245–70. New York: CRC Press, 2017. http://dx.doi.org/10.4324/9781315161549-10.

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Anand, Vandita, and Anjana Pandey. "Bioremediation of Cr(VI)-Contaminated Soil using Bacteria." In Removal of Refractory Pollutants from Wastewater Treatment Plants, 205–32. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003204442-11.

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Timmis, K. N., F. Rojo, and J. L. Ramos. "Prospects for Laboratory Engineering of Bacteria to Degrade Pollutants." In Environmental Biotechnology, 61–79. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0824-7_4.

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de Lorenzo, Víctor, and Herminia Loza-Tavera. "Microbial Bioremediation of Chemical Pollutants: How Bacteria Cope with Multi-Stress Environmental Scenarios." In Bacterial Stress Responses, 481–92. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555816841.ch30.

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Zinicovscaia, Inga, Alexey V. Safonov, and Tatiana V. Khijniak. "Biosorption of Hexavalent Chromium and Uranium by Bacteria, Microalga, and Fungi." In Heavy Metals and Other Pollutants in the Environment, 333–60. Toronto : Apple Academic Press, 2017.: Apple Academic Press, 2017. http://dx.doi.org/10.1201/9781315366029-17.

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Zinicovscaia, Inga, Alexey V. Safonov, and Tatiana V. Khijniak. "Chapter 17: Biosorption of Hexavalent Chromium and Uranium by Bacteria, Microalga, and Fungi." In Heavy Metals and Other Pollutants in The Environment, 333–60. 6000 Broken Sound Parkway NW, Suite 300 Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315366029-21.

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Conference papers on the topic "Pollutants and Bacteria":

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MADUKASI, E. I., and CHUNHUA HE. "BIODEGADATION OF PHARMACEUTICAL ORGANIC POLLUTANTS BY PHOTOSYNTHETIC BACTERIA." In Proceedings of the International Conference on CBEE 2009. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814295048_0059.

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Smets, W., S. Moretti, and S. Lebeer. "Study of airborne bacteria and their relation to air pollutants." In SUSTAINABLE CITY 2014. Southampton, UK: WIT Press, 2014. http://dx.doi.org/10.2495/sc141222.

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HUANG, XIN-XIN, MIAO HE, HAN-CHANG SHI, and QIANG CAI. "CONSTRUCTION OF RECOMBINANT LUMINESCENCE BACTERIA VECTOR TO EVALUATE GENETOXIC ENVIRONMENTAL POLLUTANTS." In Proceedings of the 15th International Symposium. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812839589_0024.

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Eltai, Nahla Omer, Lubna Abu Rub, Hana A. Mohamed, Asma A. Al Thani, Hamda Qotba, and Hadi M. Yassine. "Testing Air Quality of Primary Health Care Centers in Qatar." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0125.

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Background: Poor indoor air quality results in significant adverse effects on human health. In particular, the hospital atmospheric environment requires high air quality to protect patients and health care workers against airborne disease including nosocomial infections. Monitoring and surveillance programs of air pollutants and communicable diseases are essential as they provide information on the effectiveness of occupational hygiene and hazard control, and beneficial in assessing risks to community and environment. Objectives: This study aims to identify, monitor and report the level of air borne bacteria at four PHCC canters in Doha. Methodology: Four primary Health Centers (HC) were selected for testing air quality namely, Qatar University HC (North of Doha), AlRayan HC (West of Doha), Um Ghualina HC (Centre of Doha) and Old airport HC (South of Doha). Three sublocations were tested in each health center including a triage room, lobby and outdoor sample; each centre was visited once a month. Two sampling methods were used in this study: Anderson impactor (viable method) and filtration method (non-viable method). Anderson six stages impactor (TISCH Environmental, USA) was used to collect airborne bacteria on nutrient agar plates. Then the samples were incubated at 37 o C for 24 - 48 hours. The average colony- forming units (CFU) of bacteria was calculated per cubic meter of air (CFU/m3 ). On the other hand, the SKC Button Sampler (SKC Inc. PA, USA) was used to collect the airborne bacteria using cellulose ester filters. The collected isolates will be identified by sequencing 16srRNA (Miseq) later. Preliminary results: According to our preliminary results, the smallest average number of bacteria in the air was detected in QU HC, 3.2 (CFU/m3 ). While the highest average number was 44.7 CFU/m3 detected in Old Airport HC. Al-Rayyan HC and Om Ghuilina HC exhibited 30 and 20 CFU/m3 sequentially. Conclusions: Our preliminary results depicted that the occupancy pattern, size, and age of the building affect the number of bacteria in the air. However, more samples will be collected for better statistical sample size and analysis. .In addition, the captured airborne bacteria will be identified by 16s r RNA sequencing later.
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Patil, Vinay, Aybala Usta, Muhammad M. Rahman, and Ramazan Asmatulu. "Investigating Effects of Graphene Nanoinclusions for Improved Desalination Rates of Salt Water Under Solar Heat." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88637.

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The development of sustainable, cost-effective, reliable, efficient and stable materials and methods for continuous fresh water production is crucial for many regions of the world. Among the many other options, graphene nanoflakes seem to be good option to solve the global water problem due to their low energy cost and simple operational process to purify waste water. The produced water can be used for drinking, agriculture, gardening, medical, industrial and other purposes. Most of the nanofilter-based multifunctional fresh water systems do not require large infrastructures or centralized systems, and can be portable to remote regions for efficient water treatment. Graphene was discovered as a single-layer of isolated graphite atoms arranged in 2D hexagonal shape, making it the thinnest and strongest material known to date. Despite its intriguing mechanical, thermal and electrical properties, usage of graphene for different industries has not been investigated in detail. The present study investigated the availability and practical use of graphene inclusions for desalination of salt water to produce fresh water. In the present study, graphene was added to 3.5wt% salt water (similar to sea water) at different percentages. Graphene has a high absorption capability to convert solar energy into heat to enhance the evaporation rate of salt water. The graphene inclusions can also be used to remove bacteria, viruses, fungi, heavy metals and ions, complex organic and inorganic compounds, and other pathogens and pollutants present in various water sources (e.g., surface, ground water, and industrial water).
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Kryuchkova, E. V. "Plant-bacterial associations in the remediation of complex pollutants." In IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-241.

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Oyekan, John, Huosheng Hu, and Dongbing Gu. "Exploiting bacterial swarms for optimal coverage of dynamic pollutant profiles." In 2010 IEEE International Conference on Robotics and Biomimetics (ROBIO). IEEE, 2010. http://dx.doi.org/10.1109/robio.2010.5723586.

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Moussa, D., M. Naitali, J. M. Herry, B. Hnatiuc, and J. L. Brisset. "Reactions induced by electrical discharges in pollutant abatement and bacterial inactivation." In 2010 12th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM). IEEE, 2010. http://dx.doi.org/10.1109/optim.2010.5510548.

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Vietmeier, Anna, Jillian Peters, Djuna Gulliver, and Nancy Trun. "CHARACTERIZATION OF BACTERIAL MANGANESE REDUCTION IN ABANDONED COALMINE DRAINAGE THAT CONTRIBUTES TO THE RE-MOBILIZATION OF POLLUTANTS." In GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023am-393274.

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Janakova, Iva. "APPLICATION OF FLOTATION AND BACTERIAL LEACHING TO ELIMINATE PERSISTENT ORGANIC POLLUTANTS IN THE INFLUENT STREAM OF CERNY PRIKOP." In SGEM2011 11th International Multidisciplinary Scientific GeoConference and EXPO. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2011/s04.102.

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Reports on the topic "Pollutants and Bacteria":

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Pray, Todd. Remediation of recalcitrant and emerging organic pollutants using bacteria and their extracted enzymes (CRADA FP00007386). Office of Scientific and Technical Information (OSTI), November 2019. http://dx.doi.org/10.2172/1575248.

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Belkin, Shimshon, Sylvia Daunert, and Mona Wells. Whole-Cell Biosensor Panel for Agricultural Endocrine Disruptors. United States Department of Agriculture, December 2010. http://dx.doi.org/10.32747/2010.7696542.bard.

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Objectives: The overall objective as defined in the approved proposal was the development of a whole-cell sensor panel for the detection of endocrine disruption activities of agriculturally relevant chemicals. To achieve this goal several specific objectives were outlined: (a) The development of new genetically engineered wholecell sensor strains; (b) the combination of multiple strains into a single sensor panel to effect multiple response modes; (c) development of a computerized algorithm to analyze the panel responses; (d) laboratory testing and calibration; (e) field testing. In the course of the project, mostly due to the change in the US partner, three modifications were introduced to the original objectives: (a) the scope of the project was expanded to include pharmaceuticals (with a focus on antibiotics) in addition to endocrine disrupting chemicals, (b) the computerized algorithm was not fully developed and (c) the field test was not carried out. Background: Chemical agents, such as pesticides applied at inappropriate levels, may compromise water quality or contaminate soils and hence threaten human populations. In recent years, two classes of compounds have been increasingly implicated as emerging risks in agriculturally-related pollution: endocrine disrupting compounds (EDCs) and pharmaceuticals. The latter group may reach the environment by the use of wastewater effluents, whereas many pesticides have been implicated as EDCs. Both groups pose a threat in proportion to their bioavailability, since that which is biounavailable or can be rendered so is a priori not a threat; bioavailability, in turn, is mediated by complex matrices such as soils. Genetically engineered biosensor bacteria hold great promise for sensing bioavailability because the sensor is a live soil- and water-compatible organism with biological response dynamics, and because its response can be genetically “tailored” to report on general toxicity, on bioavailability, and on the presence of specific classes of toxicants. In the present project we have developed a bacterial-based sensor panel incorporating multiple strains of genetically engineered biosensors for the purpose of detecting different types of biological effects. The overall objective as defined in the approved proposal was the development of a whole-cell sensor panel for the detection of endocrine disruption activities of agriculturally relevant chemicals. To achieve this goal several specific objectives were outlined: (a) The development of new genetically engineered wholecell sensor strains; (b) the combination of multiple strains into a single sensor panel to effect multiple response modes; (c) development of a computerized algorithm to analyze the panel responses; (d) laboratory testing and calibration; (e) field testing. In the course of the project, mostly due to the change in the US partner, three modifications were introduced to the original objectives: (a) the scope of the project was expanded to include pharmaceuticals (with a focus on antibiotics) in addition to endocrine disrupting chemicals, (b) the computerized algorithm was not fully developed and (c) the field test was not carried out. Major achievements: (a) construction of innovative bacterial sensor strains for accurate and sensitive detection of agriculturally-relevant pollutants, with a focus on endocrine disrupting compounds (UK and HUJ) and antibiotics (HUJ); (b) optimization of methods for long-term preservation of the reporter bacteria, either by direct deposition on solid surfaces (HUJ) or by the construction of spore-forming Bacillus-based sensors (UK); (c) partial development of a computerized algorithm for the analysis of sensor panel responses. Implications: The sensor panel developed in the course of the project was shown to be applicable for the detection of a broad range of antibiotics and EDCs. Following a suitable development phase, the panel will be ready for testing in an agricultural environment, as an innovative tool for assessing the environmental impacts of EDCs and pharmaceuticals. Furthermore, while the current study relates directly to issues of water quality and soil health, its implications are much broader, with potential uses is risk-based assessment related to the clinical, pharmaceutical, and chemical industries as well as to homeland security.
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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova, and Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
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Lahav, Ori, Albert Heber, and David Broday. Elimination of emissions of ammonia and hydrogen sulfide from confined animal and feeding operations (CAFO) using an adsorption/liquid-redox process with biological regeneration. United States Department of Agriculture, March 2008. http://dx.doi.org/10.32747/2008.7695589.bard.

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The project was originally aimed at investigating and developing new efficient methods for cost effective removal of ammonia (NH₃) and hydrogen sulfide (H₂S) from Concentrated Animal Feeding Operations (CAFO), in particular broiler and laying houses (NH₃) and hog houses (H₂S). In both cases, the principal idea was to design and operate a dedicated air collection system that would be used for the treatment of the gases, and that would work independently from the general ventilation system. The advantages envisaged: (1) if collected at a point close to the source of generation, pollutants would arrive at the treatment system at higher concentrations; (2) the air in the vicinity of the animals would be cleaner, a fact that would promote animal growth rates; and (3) collection efficiency would be improved and adverse environmental impact reduced. For practical reasons, the project was divided in two: one effort concentrated on NH₃₍g₎ removal from chicken houses and another on H₂S₍g₎ removal from hog houses. NH₃₍g₎ removal: a novel approach was developed to reduce ammonia emissions from CAFOs in general, and poultry houses in particular. Air sucked by the dedicated air capturing system from close to the litter was shown to have NH₃₍g₎ concentrations an order of magnitude higher than at the vents of the ventilation system. The NH₃₍g₎ rich waste air was conveyed to an acidic (0<pH<~5) bubble column reactor where NH₃ was converted to NH₄⁺. The reactor operated in batch mode, starting at pH 0 and was switched to a new acidic absorption solution just before NH₃₍g₎ breakthrough occurred, at pH ~5. Experiments with a wide range of NH₃₍g₎ concentrations showed that the absorption efficiency was practically 100% throughout the process as long as the face velocity was below 4 cm/s. The potential advantages of the method include high absorption efficiency, lower NH₃₍g₎ concentrations in the vicinity of the birds, generation of a valuable product and the separation between the ventilation and ammonia treatment systems. A small scale pilot operation conducted for 5 weeks in a broiler house showed the approach to be technically feasible. H₂S₍g₎ removal: The main goal of this part was to develop a specific treatment process for minimizing H₂S₍g₎ emissions from hog houses. The proposed process consists of three units: In the 1ˢᵗ H₂S₍g₎ is absorbed into an acidic (pH<2) ferric iron solution and oxidized by Fe(III) to S⁰ in a bubble column reactor. In parallel, Fe(III) is reduced to Fe(II). In the 2ⁿᵈ unit Fe(II) is bio-oxidized back to Fe(III) by Acidithiobacillus ferrooxidans (AF).In the 3ʳᵈ unit S⁰ is separated from solution in a gravity settler. The work focused on three sub-processes: the kinetics of H₂S absorption into a ferric solution at low pH, the kinetics of Fe²⁺ oxidation by AF and the factors that affect ferric iron precipitation (a main obstacle for a continuous operation of the process) under the operational conditions. H₂S removal efficiency was found higher at a higher Fe(III) concentration and also higher for higher H₂S₍g₎ concentrations and lower flow rates of the treated air. The rate limiting step of the H₂S reactive absorption was found to be the chemical reaction rather than the transition from gas to liquid phase. H₂S₍g₎ removal efficiency of >95% was recorded with Fe(III) concentration of 9 g/L using typical AFO air compositions. The 2ⁿᵈ part of the work focused on kinetics of Fe(II) oxidation by AF. A new lab technique was developed for determining the kinetic equation and kinetic parameters (KS, Kₚ and mₘₐₓ) for the bacteria. The 3ʳᵈ part focused on iron oxide precipitation under the operational conditions. It was found that at lower pH (1.5) jarosite accumulation is slower and that the performance of the AF at this pH was sufficient for successive operation of the proposed process at the H₂S fluxes predicted from AFOs. A laboratory-scale test was carried out at Purdue University on the use of the integrated system for simultaneous hydrogen sulfide removal from a H₂S bubble column filled with ferric sulfate solution and biological regeneration of ferric ions in a packed column immobilized with enriched AFbacteria. Results demonstrated the technical feasibility of the integrated system for H₂S removal and simultaneous biological regeneration of Fe(III) for potential continuous treatment of H₂S released from CAFO. NH₃ and H₂S gradient measurements at egg layer and swine barns were conducted in winter and summer at Purdue. Results showed high potential to concentrate NH₃ and H₂S in hog buildings, and NH₃ in layer houses. H₂S emissions from layer houses were too low for a significant gradient. An NH₃ capturing system was designed and tested in a 100-chicken broiler room. Five bell-type collecting devices were installed over the litter to collect NH₃ emissions. While the air extraction system moved only 10% of the total room ventilation airflow rate, the fraction of total ammonia removed was 18%, because of the higher concentration air taken from near the litter. The system demonstrated the potential to reduce emissions from broiler facilities and to concentrate the NH₃ effluent for use in an emission control system. In summary, the project laid a solid foundation for the implementation of both processes, and also resulted in a significant scientific contribution related to AF kinetic studies and ferrous analytical measurements.
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Jalkanen, Jukka-Pekka, Erik Fridell, Jaakko Kukkonen, Jana Moldanova, Leonidas Ntziachristos, Achilleas Grigoriadis, Maria Moustaka, et al. Environmental impacts of exhaust gas cleaning systems in the Baltic Sea, North Sea, and the Mediterranean Sea area. Finnish Meteorological Institute, 2024. http://dx.doi.org/10.35614/isbn.9789523361898.

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Description: Shipping is responsible for a range of different pressures affecting air quality, climate, and the marine environment. Most social and economic analyses of shipping have focused on air pollution assessment and how shipping may impact climate change and human health. This risks that policies may be biased towards air pollution and climate change, whilst impacts on the marine environment are not as well known. One example is the sulfur regulation introduced in January 2020, which requires shipowners to use a compliant fuel with a sulfur content of 0.5% (0.1% in SECA regions) or use alternative compliance options (Exhaust Gas Cleaning Systems, EGCS) that are effective in reducing sulfur oxide (SOx) emissions to the atmosphere. The EGCS cleaning process results in large volumes of discharged water that includes a wide range of contaminants. Although regulations target SOx removal, other pollutants such as polycyclic aromatic hydrocarbons (PAHs), metals and combustion particles are removed from the exhaust to the wash water and subsequently discharged to the marine environment. Based on dilution series of the Whole Effluent Testing (WET), the impact of the EGCS effluent on marine invertebrate species and on phytoplankton was found to vary between taxonomic groups, and between different stages of the invertebrate life cycle. Invertebrates were more affected than phytoplankton, and the most sensitive endpoint detected in the present project was the fertilisation of sea urchin eggs, which were negatively affected at a sample dilution of 1 : 1,000,000. Dilutions of 1: 100,000 were harmful to early development of several of the tested species, including mussels, polychaetes, and crustaceans. The observed effects at these low concentrations of EGCS effluent were reduced egg production, and deformations and abnormal development of the larvae of the species. The ecotoxicological data produced in the EMERGE project were used to derive Predicted No Effect Concentration values. Corresponding modelling studies revealed that the EGCS effluent can be considered as a single entity for 2-10 days from the time of discharge, depending on the environmental conditions like sea currents, winds, and temperature. Area 10-30 km outside the shipping lanes will be prone to contaminant concentrations corresponding to 1 : 1,000,000 dilution which was deemed harmful for most sensitive endpoints of WET experiments. Studies for the Saronikos Gulf (Aegean Sea) revealed that the EGCS effluent dilution rate exceeded the 1 : 1,000,000 ratio 70% of the time at a distance of about 10 km from the port. This was also observed for 15% of the time within a band of 10 km wide along the shipping lane extending 500 km away from the port of Piraeus. When mortality of adult specimens of one of the species (copepod Acartia tonsa) was used as an endpoint it was found to be 3-4 orders of magnitude less sensitive to EGCS effluent than early life stage endpoints like fertilisation of eggs and larval development. Mortality of Acartia tonsa is commonly used in standard protocols for ecotoxicological studies, but our data hence shows that it seriously underestimates the ecologically relevant toxicity of the effluent. The same is true for two other commonly used and recommended endpoints, phytoplankton growth and inhibition of bioluminescence in marine bacteria. Significant toxic effects were reached only after addition of 20-40% effluent. A marine environmental risk assessment was performed for the Öresund region for baseline year 2018, where Predicted Environmental Concentrations (PECs) of open loop effluent discharge water were compared to the PNEC value. The results showed modelled concentrations of open loop effluent in large areas to be two to three orders of magnitude higher than the derived PNEC value, yielding a Risk Characterisation Ratio of 500-5000, which indicates significant environmental risk. Further, it should be noted that between 2018-2022 the number of EGCS vessels more than quadrupled in the area from 178 to 781. In this work, the EGCS discharges of the fleet in the Baltic Sea, North Sea, the English Channel, and the Mediterranean Sea area were studied in detail. The assessments of impacts described in this document were performed using a baseline year 2018 and future scenarios. These were made for the year 2050, based on different projections of transport volumes, also considering the fuel efficiency requirements and ship size developments. From the eight scenarios developed, two extremes were chosen for impact studies which illustrate the differences between a very high EGCS usage and a future without the need for EGCS while still compliant to IMO initial GHG strategy. The scenario without EGCS leads to 50% reduction of GHG emissions using low sulfur fuels, LNG, and methanol. For the high EGCS adoption scenario in 2050, about a third of the fleet sailing the studied sea areas would use EGCS and effluent discharge volumes would be increased tenfold for the Baltic Sea and hundredfold for the Mediterranean Sea when compared to 2018 baseline discharges. Some of the tested species, mainly the copepods, have a central position in pelagic food webs as they feed on phytoplankton and are themselves the main staple food for most fish larvae and for some species of adult fish, e.g., herring. The direct effect of the EGSE on invertebrates will therefore have an important indirect effect on the fish feeding on them. Effects are greatest in and near shipping lanes. Many important shipping lanes run close to shore and archipelago areas, and this also puts the sensitive shallow water coastal ecosystems at risk. It should be noted that no studies on sub-lethal effects of early 19 life stages in fish were included in the EMERGE project, nor are there any available data on this in the scientific literature. The direct toxic effects on fish at the expected concentrations of EGCS effluent are therefore largely unknown. According to the regional modelling studies, some of the contaminants will end up in sediments along the coastlines and archipelagos. The documentation of the complex chemical composition of EGCS effluent is in sharp contrast to the present legislation on threshold levels for content in EGCS effluent discharged from ships, which includes but a few PAHs, pH, and turbidity. Traditional assessments of PAHs in environmental and marine samples focus only on the U.S. Environmental Protection Agency (EPA) list of 16 priority PAHs, which includes only parent PAHs. Considering the complex PAHs assemblages and the importance of other related compounds, it is important to extend the EPA list to include alkyl-PAHs to obtain a representative monitoring of EGCS effluent and to assess the impact of its discharges into the marine environment. An economic evaluation of the installation and operational costs of EGCS was conducted noting the historical fuel price differences of high and low sulfur fuels. Equipment types, installation dates and annual fuel consumption from global simulations indicated that 51% of the global EGCS fleet had already reached break-even by the end of 2022, resulting in a summarised profit of 4.7 billion €2019. Within five years after the initial installation, more than 95% of the ships with open loop EGCS reach break-even. The pollutant loads from shipping come both through atmospheric deposition and direct discharges. This underlines the need of minimising the release of contaminants by using fuels which reduce the air emissions of harmful components without creating new pollution loads through discharges. Continued use of EGCS and high sulfur fossil fuels will delay the transition to more sustainable options. The investments made on EGCS enable ships to continue using fossil fuels instead of transitioning away from them as soon as possible as agreed in the 2023 Dubai Climate Change conference. Continued carriage of residual fuels also increases the risk of dire environmental consequences whenever accidental releases of oil to the sea occur.

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