Статті в журналах: "Wastewater valorization"

1

Alalam, Sabine, Farah Ben-Souilah, Marie-Hélène Lessard, Julien Chamberland, Véronique Perreault, Yves Pouliot, Steve Labrie, and Alain Doyen. "Characterization of Chemical and Bacterial Compositions of Dairy Wastewaters." Dairy 2, no. 2 (April 1, 2021): 179–90. http://dx.doi.org/10.3390/dairy2020016.

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The dairy industry produces large amounts of wastewater, including white and cleaning wastewater originating principally from rinsing and cleaning-in-place procedures. Their valorization into process water and non-fat milk solids, in the case of white wastewater, or the renewal of cleaning solutions could be achieved using pressure-driven membrane processes. However, it is crucial to determine the intrinsic characteristics of wastewaters, such as proximate composition and bacterial composition, to optimize their potential for valorization. Consequently, white and cleaning wastewaters were sampled from industrial-scale pasteurizers located in two different Canadian dairy processing plants. Bacterial profiles of dairy wastewaters were compared to those of tap waters, pasteurized skim milk and unused cleaning solutions. The results showed that the physicochemical characteristics as well as non-fat milk solids contents differed drastically between the two dairy plants due to different processing conditions. A molecular approach combining quantitative real-time polymerase chain reaction (qPCR) and metabarcoding was used to characterize the bacteria present in these solutions. The cleaning solutions did not contain sufficient genomic DNA for sequencing. In white wastewater, the bacterial contamination differed depending on the dairy plant (6.91 and 7.21 log10 16S gene copies/mL). Psychrotrophic Psychrobacter genus (50%) dominated white wastewater from plant A, whereas thermophilic Anoxybacillus genus (56%) was predominant in plant B wastewater. The use of cold or warm temperatures during the pasteurizer rinsing step in each dairy plant might explain this difference. The detailed characterization of dairy wastewaters described in this study is important for the dairy sector to clearly identify the challenges in implementing strategies for wastewater valorization.

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2

Jeguirim, Mejdi, and Salah Jellali. "Wastewater Treatment, Valorization, and Reuse." Water 13, no. 4 (February 21, 2021): 548. http://dx.doi.org/10.3390/w13040548.

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3

Ţurcanu, Anca Andreea, Ecaterina Matei, Maria Râpă, Andra Mihaela Predescu, George Coman, and Cristian Predescu. "Biowaste Valorization Using Hydrothermal Carbonization for Potential Wastewater Treatment Applications." Water 14, no. 15 (July 29, 2022): 2344. http://dx.doi.org/10.3390/w14152344.

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In today’s world, due to population increase, there are many alarming and potential catastrophic problems like climate change, environmental pollution and an enormous mass of wastes constantly produced by humankind to find innovative solutions for the management, recycling, and valorization of biowaste from agricultural production, food processing, and organic household residues. The search for sustainable and efficient wastewater treatment technologies has gained scientific interest recently; particular focus is on using biowaste to produce hydrochars (HCs) via the hydrothermal carbonization (HTC) process used as adsorbent materials for dye, heavy metal, and emerging pollutant removal. HTC materials derived from renewable resources are an environmentally friendly and adequate way to adsorb pollutants such as organic and inorganic molecules from wastewaters. This review focuses on the advantages of the HTC process which lead to improved properties of the materials obtained, making them highly efficient in wastewater treatment. The information presented in this paper was derived from the most recent publications in the field. Future perspectives of HC materials should consider the possibilities of scale-up, pretreatment of biowastes, and the optimal parameters of the HTC process to produce HCs applied for pollutant removal from wastewaters.

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4

Broos, Waut, Nikolett Wittner, Jordi Geerts, Jan Dries, Siegfried E. Vlaeminck, Nina Gunde-Cimerman, Aurore Richel, and Iris Cornet. "Evaluation of Lignocellulosic Wastewater Valorization with the Oleaginous Yeasts R. kratochvilovae EXF7516 and C. oleaginosum ATCC 20509." Fermentation 8, no. 5 (April 30, 2022): 204. http://dx.doi.org/10.3390/fermentation8050204.

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During the conversion of lignocellulose, phenolic wastewaters are generated. Therefore, researchers have investigated wastewater valorization processes in which these pollutants are converted to chemicals, i.e., lipids. However, wastewaters are lean feedstocks, so these valorization processes in research typically require the addition of large quantities of sugars and sterilization, which increase costs. This paper investigates a repeated batch fermentation strategy with Rhodotorula kratochvilovae EXF7516 and Cutaneotrichosporon oleaginosum ATCC 20509, without these requirements. The pollutant removal and its conversion to microbial oil were evaluated. Because of the presence of non-monomeric substrates, the ligninolytic enzyme activity was also investigated. The repeated batch fermentation strategy was successful, as more lipids accumulated every cycle, up to a total of 5.4 g/L (23% cell dry weight). In addition, the yeasts consumed up to 87% of monomeric substrates, i.e., sugars, aromatics, and organics acids, and up to 23% of non-monomeric substrates, i.e., partially degraded xylan, lignin, cellulose. Interestingly, lipid production was only observed during the harvest phase of each cycle, as the cells experienced stress, possibly due to oxygen limitation. This work presents the first results on the feasibility of valorizing non-sterilized lignocellulosic wastewater with R. kratochvilovae and C. oleaginosum using a cost-effective repeated batch strategy.

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5

Welz, P. J. "Edible seed oil waste: status quo and future perspectives." Water Science and Technology 80, no. 11 (December 1, 2019): 2107–16. http://dx.doi.org/10.2166/wst.2020.043.

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Abstract Large volumes of process water and steam are required for extraction and refining of edible seed oils. Water usage in most industries has decreased over the years as increasing emphasis is being placed on water re-use in modern facilities. However, given the size of the edible seed oil industry globally, there is a lack of current quantitative data about water use and wastewater generation. As the world moves towards a circular economy and water becomes more scarce, it is imperative that the industry players provide meaningful input/output data in order to benchmark and identify areas for waste valorization. This review provides data currently available in the public domain on the specific wastewater intake and wastewater generation by the edible seed oil industry, highlighting the need for further data collection. In addition, wastewater quality and current and future wastewater treatment technologies are discussed, as well as the potential for valorization of solid waste and effluent from the industry, and potential avenues for future research.

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6

Li, Yalin, Sydney A. Slouka, Shanka M. Henkanatte-Gedera, Nagamany Nirmalakhandan, and Timothy J. Strathmann. "Seasonal treatment and economic evaluation of an algal wastewater system for energy and nutrient recovery." Environmental Science: Water Research & Technology 5, no. 9 (2019): 1545–57. http://dx.doi.org/10.1039/c9ew00242a.

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Torres-Valenzuela, Laura Sofia, Ana Ballesteros-Gomez, Johanna Serna, Andrea Arango, and Soledad Rubio. "Supramolecular solvents for the valorization of coffee wastewater." Environmental Science: Water Research & Technology 6, no. 3 (2020): 757–66. http://dx.doi.org/10.1039/c9ew01095e.

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8

Ouslimani, N., F. Zrari, M. T. Abadlia, and H. Benabed. "Valorization of Fibrous Waste for the Wastewater Discoloration." Asian Journal of Chemistry 25, no. 15 (2013): 8603–6. http://dx.doi.org/10.14233/ajchem.2013.14860.

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9

Shi, Shuai, Guoren Xu, Huarong Yu, and Zhao Zhang. "Strategies of valorization of sludge from wastewater treatment." Journal of Chemical Technology & Biotechnology 93, no. 4 (February 26, 2018): 936–44. http://dx.doi.org/10.1002/jctb.5548.

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10

Aissa, Imen, Nadia Kharrat, Fatma Aloui, Mohamed Sellami, Mohamed Bouaziz, and Youssef Gargouri. "Valorization of antioxidants extracted from olive mill wastewater." Biotechnology and Applied Biochemistry 64, no. 4 (February 28, 2017): 579–89. http://dx.doi.org/10.1002/bab.1509.

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11

Quintero-García, Omar J., Heilyn Pérez-Soler, and Myriam A. Amezcua-Allieri. "Enzymatic Treatments for Biosolids: An Outlook and Recent Trends." International Journal of Environmental Research and Public Health 20, no. 6 (March 9, 2023): 4804. http://dx.doi.org/10.3390/ijerph20064804.

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Wastewaters are nutrient-rich organic materials containing significant concentrations of different nutrients, dissolved and particulate matter, microorganisms, solids, heavy metals, and organic pollutants, including aromatic xenobiotics. This variety makes wastewater treatment a technological challenge. As a result of wastewater treatment, biosolids are generated. Biosolids, commonly called sewage sludge, result from treating and processing wastewater residuals. Increased biosolids, or activated sludge, from wastewater treatment is a major environmental and social problem. Therefore, sustainable and energy-efficient wastewater treatment systems must address the water crisis and environmental deterioration. Although research on wastewater has received increasing attention worldwide, the significance of biosolids treatments and valorization is still poorly understood in terms of obtaining value-added products. Hence, in this review, we established some leading technologies (physical, chemical, and biological) for biosolids pretreatment. Later, the research focuses on natural treatment by fungal enzymes to end with lignocellulosic materials and xenobiotic compounds (polyaromatic hydrocarbons) as a carbon source to obtain biobased chemicals. Finally, this review discussed some recent trends and promising renewable resources within the biorefinery approach for bio-waste conversion to value-added by-products.

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12

Li, Yalin, and Timothy J. Strathmann. "Kinetics and mechanism for hydrothermal conversion of polyhydroxybutyrate (PHB) for wastewater valorization." Green Chemistry 21, no. 20 (2019): 5586–97. http://dx.doi.org/10.1039/c9gc02507c.

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13

Gavrilaș, Simona, Ioan Calinovici, Sabin Chiș, Claudiu-Ștefan Ursachi, Mirabela Raț, and Florentina-Daniela Munteanu. "White Grape Pomace Valorization for Remediating Purposes." Applied Sciences 12, no. 4 (February 14, 2022): 1997. http://dx.doi.org/10.3390/app12041997.

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The present investigation focuses on a possible alternative to reduce grape pomace’s negative impact on the environment by exploiting its capacities for wastewater remediation. Therefore, three directions are followed: (1) the characterization of white grape byproducts’ antioxidant and antiradical properties; (2) the determination of organophosphorus compound concentration that might be present in the samples; and (3) the evaluation of the possible use for wastewater remediation. The grape pomace was used for obtaining different extracts considering different extraction conditions. The hydroalcoholic extracts have an increased amount of total phenolic content. The lyophilized hydroalcoholic extract showed high total phenolic content (159.52 mg/100 g) and low organophosphorus content (0.257 ± 0.015 nmol). The lowest DPPH antiradical-scavenging activities were obtained for the extracts in ethanol obtained from refrigerated pomace (0.055) and for dried pomace (0.045).

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14

García, N. Anes, F. Blanco Álvarez, and A. L. Marqués Sierra. "Circular Economy in the Manufacture of Bioplastics: From Sewage Sludge to Plastic Bottle." Proceedings 2, no. 23 (November 26, 2018): 1425. http://dx.doi.org/10.3390/proceedings2231425.

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The main objective of this study is the potential evaluation of obtaining bioplastics through biodegradable polyesters synthesized by bacteria, present in the anaerobic treatment of urban and industrial wastewater, which have a series of characteristics to consider as their processing as material bioplastic In Asturias, more than 70,000 tons of sludge are produced and, by applying circular economy criteria and technologies for the production of bioplastics from wastewater, a synergy could be obtained that would allow the reuse of sludge by valorization as raw material. to produce bioplastics. This valorization can be carried out mainly through the combination of two technologies, on the one hand, anaerobic fermentation to produce volatile fatty acids and on the other the generation of bacterial populations that produce Polyhydroxyalkanoates (PHA’s). The PHAs are obtained from the microorganisms present in the sludge generated in the wastewater treatment process.

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15

Mikucka, Wioleta, and Magdalena Zielińska. "Distillery Stillage: Characteristics, Treatment, and Valorization." Applied Biochemistry and Biotechnology 192, no. 3 (June 18, 2020): 770–93. http://dx.doi.org/10.1007/s12010-020-03343-5.

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Abstract Distilleries are among the most polluting industries because ethanol fermentation results in the discharge of large quantities of high-strength liquid effluents with high concentrations of organic matter and nitrogen compounds, low pH, high temperature, dark brown color, and high salinity. The most common method of managing this wastewater (distillery stillage) is to use it for soil conditioning, but this requires thickening the wastewater and may cause soil pollution due to its high nitrogen content. Therefore, treatment of distillery stillage is preferable. This review discusses individual biological and physico-chemical treatment methods and combined technologies. In addition, special attention is paid to valorization of distillery stillage, which is a valuable source of polysaccharides and volatile fatty acids (VFAs), as well as natural antioxidants, including polyphenols and other bioactive compounds of interest to the pharmaceutical, cosmetic, and food industries. New directions in improvement of valorization technologies are highlighted, including the search for new eutectic solvents for extracting these compounds. Such technologies are essential for sustainable development, which requires the use of management and valorization strategies for recovery of valuable compounds with minimal disposal of waste streams.

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16

Jayakody, Lahiru N., Christopher W. Johnson, Jason M. Whitham, Richard J. Giannone, Brenna A. Black, Nicholas S. Cleveland, Dawn M. Klingeman, et al. "Correction: Thermochemical wastewater valorization via enhanced microbial toxicity tolerance." Energy & Environmental Science 14, no. 12 (2021): 6678. http://dx.doi.org/10.1039/d1ee90066h.

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17

Subhash, Suja, Pradeesh Babu, Amrutha Vijayakumar, Reshma Alookaran Suresh, Ajith Madhavan, Bipin Gopalakrishnan Nair, and Sanjay Pal. "Aspergillus niger Culture Filtrate (ACF) Mediated Biocontrol of Enteric Pathogens in Wastewater." Water 14, no. 1 (January 5, 2022): 119. http://dx.doi.org/10.3390/w14010119.

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Robust control of pathogens in sewage facilitates safe reuse of wastewater rich in valuable nutrients for potential valorization through biological means. Aspergillus niger is widely reported in bioremediation of wastewater but studies on control of enteric pathogens in sewage are very sparse. So, this study aimed at exploring the antibacterial and nematicidal activity of A. niger culture filtrate (ACF). Antibacterial activity of ACF on enteric pathogens (Klebsiella pneumoniae, Pseudomonas aeruginosa, Vibrio cholerae, Salmonella enterica, Shigella dysenteriae, Escherichia coli, Staphylococcus aureus, Klebsiella variicola) was determined by spectrophotometric growth analysis, resazurin based viability assay and biofilm formation assay. ACF showed inhibition against all enteric pathogens except Pseudomonas aeruginosa. Nematicidal studies on Caenorhabditis elegans showed 85% egg hatch inhibition and 52% mortality of L1 larvae. Sewage treatment with ACF at 1:1 (v/v) showed 2–3 log reduction in coliforms, Klebsiella, Shigella, Salmonella, S. aureus and Vibrio except Pseudomonas, indicating significant alteration of complex microbial dynamics in wastewater. Application of ACF can potentially be used as a robust biocontrol strategy against infectious microbes in wastewater and subsequent valorization by cultivating beneficial Pseudomonas.

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Quattrociocchi, Bernardino, F. Mercuri, and L. Pasqualino. "Valorization and Awareness of the Territory through Wastewater Treatment Process: The Project Life+Rewetland." Modern Environmental Science and Engineering 1, no. 6 (February 2016): 275–85. http://dx.doi.org/10.15341/mese(2333-2581)/06.01.2015/001.

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Pajcin, Ivana, Vanja Vlajkov, Marta Loc, Jelena Dodic, Mila Grahovac, and Jovana Grahovac. "Valorization of barrel washing winery wastewater through production of microbial biocontrol agents." Acta Periodica Technologica, no. 53 (2022): 223–30. http://dx.doi.org/10.2298/apt2253223p.

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Winery wastewater arising from different wine production phases poses a significant environmental threat and economic burden for wine producers considering the legislative requirements regarding the obligatory wastewater treatment. Taking into account the high amount of organic and inorganic nutrients suitable for microbial growth being present in the winery wastewater, the aim of this study was to investigate a possible valorisation route for barrel washing winery wastewater through production of microbial biocontrol agents based on Bacillus sp. The produced biocontrol agents were tested against bacterial and fungal plant pathogens, including Xanthomonas campestris, Xanthomonas euvesicatoria and Aspergillus flavus. The results of in vitro antimicrobial activity testing have shown the high potential of barrel washing winery wastewater to be used as substrate for Bacillus sp. growth, considering that inhibition zone diameters of biocontrol agents based on waste substrate were even higher compared to commercial synthetic medium in case of Aspergillus flavus suppression. This study opens a possibility to further optimize bioprocess conditions including valorisation of barrel washing winery wastewater to maximize antimicrobial activity of the produced biocontrol agents and contribute to the increase of cost-effectiveness of both wine and biocontrol agent?s production.

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Kusch-Brandt, Sigrid, and Mohammad A. T. Alsheyab. "Wastewater Refinery: Producing Multiple Valuable Outputs from Wastewater." J 4, no. 1 (February 27, 2021): 51–61. http://dx.doi.org/10.3390/j4010004.

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A wastewater refinery is a multifunctional solution that combines different technologies and processing schemes to recover a spectrum of valuable materials from municipal or industrial wastewater. The concept of wastewater refinery introduces a new perspective on wastewater treatment and management. It aims at making the most of wastewater constituents by co-producing different worthful outputs, such as water, energy, nitrogen, sulfide, and phosphorous. This can turn the treatment of wastewater from a major cost into a source of profit. The wastewater refinery approach is well aligned with the concept of the circular economy. A case study on Qatar’s wastewater revealed the potential recovery of significant quantities of valuable resources embodied in the country’s wastewater. Valorization of organic constituents and the recovery of nitrogen, phosphorus, and sulfide should be given priority. To facilitate the adoption of the wastewater refinery concept, research is required to explore technical and economic bottlenecks.

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21

Maurya, Rahulkumar, Xinyu Zhu, Borja Valverde-Pérez, Boda Ravi Kiran, Thiyam General, Suvigya Sharma, Anil Kumar Sharma, et al. "Advances in microalgal research for valorization of industrial wastewater." Bioresource Technology 343 (January 2022): 126128. http://dx.doi.org/10.1016/j.biortech.2021.126128.

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22

Mseddi, Salma, Leila Chaari, Chokri Belaid, Ikram Chakchouk, and Monem Kallel. "Valorization of treated olive mill wastewater in fertigation practice." Environmental Science and Pollution Research 23, no. 16 (March 22, 2015): 15792–800. http://dx.doi.org/10.1007/s11356-015-4353-6.

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23

Duque, Anouk F., Riccardo Campo, Angeles Val del Rio, and Catarina L. Amorim. "Wastewater Valorization: Practice around the World at Pilot- and Full-Scale." International Journal of Environmental Research and Public Health 18, no. 18 (September 8, 2021): 9466. http://dx.doi.org/10.3390/ijerph18189466.

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Over the last few years, wastewater treatment plants (WWTPs) have been rebranded as water resource recovery facilities (WRRFs), which recognize the resource recovery potential that exists in wastewater streams. WRRFs contribute to a circular economy by not only producing clean water but by recovering valuable resources such as nutrients, energy, and other bio-based materials. To this aim, huge efforts in technological progress have been made to valorize sewage and sewage sludge, transforming them into valuable resources. This review summarizes some of the widely used and effective strategies applied at pilot- and full-scale settings in order to valorize the wastewater treatment process. An overview of the different technologies applied in the water and sludge line is presented, covering a broad range of resources, i.e., water, biomass, energy, nutrients, volatile fatty acids (VFA), polyhydroxyalkanoates (PHA), and exopolymeric substances (EPS). Moreover, guidelines and regulations around the world related to water reuse and resource valorization are reviewed.

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24

Capodaglio, Andrea G. "Pulse Electric Field Technology for Wastewater and Biomass Residues’ Improved Valorization." Processes 9, no. 5 (April 22, 2021): 736. http://dx.doi.org/10.3390/pr9050736.

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Development and adoption of more efficient and robust technologies for reuse of wastewater embedded resources, in particular materials and energy, is becoming an unavoidable necessity. Among many emerging technologies in the sector of wastewater treatment residuals valorization, Pulsed Electric Field (PEF) processes have shown interesting potential, although they have not yet entered the sector’s mainstream as a consolidated commercial technology, as in other industrial applications, such as the food, medical, and bio-based industries. PEF is a non-thermal technology suitable to biological applications, involving gentle cell disintegration and enhanced cell membrane permeability and as such applicable to disinfection, sterilization, and to those processes that benefit from an enhanced extraction of organic compounds from biological matter, such as anaerobic digestion, biological processes for recovery of nutrients, and biorefinery of cell-embedded compounds. PEF technology applications in wastewater/biomass residues management are reported and advantages, drawbacks, and barriers of the technology are discussed in this paper.

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Huertas-Alonso, Alberto J., Diego J. Gonzalez-Serrano, Milad Hadidi, Manuel Salgado-Ramos, Jose C. Orellana-Palacios, M. Prado Sánchez-Verdú, Qiang Xia, et al. "Table Olive Wastewater as a Potential Source of Biophenols for Valorization: A Mini Review." Fermentation 8, no. 5 (May 9, 2022): 215. http://dx.doi.org/10.3390/fermentation8050215.

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The table olive industry generates high amounts of wastewater annually during the alkaline treatment, fermentation, and washing steps of olives. High conductivity and salt content, as well as the high organic and biophenol contents of these waters, is a worldwide problem, especially in the Mediterranean region, which is the major table olive producing area. There is a wide variety of bioactives found in wastewater derived from table olive processing. The main compounds of table olive wastewater, such as those derived from phenolic, hydrocarbon, and sugar fractions, can be recovered and reused. In this review, the table olive manufacturing processes and the volumes and composition of wastewater generated from the different methods of table olive processing are discussed. In addition, biophenols of table olive water and their biological activities are also introduced. The high concentrations of valuable biophenols, such as tyrosol and hydroxytyrosol, show promising potential for valorizing table olive wastewater; however, more research is needed in this area.

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Elhami, Vahideh, Evelyn C. Antunes, Hardy Temmink, and Boelo Schuur. "Recovery Techniques Enabling Circular Chemistry from Wastewater." Molecules 27, no. 4 (February 18, 2022): 1389. http://dx.doi.org/10.3390/molecules27041389.

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In an era where it becomes less and less accepted to just send waste to landfills and release wastewater into the environment without treatment, numerous initiatives are pursued to facilitate chemical production from waste. This includes microbial conversions of waste in digesters, and with this type of approach, a variety of chemicals can be produced. Typical for digestion systems is that the products are present only in (very) dilute amounts. For such productions to be technically and economically interesting to pursue, it is of key importance that effective product recovery strategies are being developed. In this review, we focus on the recovery of biologically produced carboxylic acids, including volatile fatty acids (VFAs), medium-chain carboxylic acids (MCCAs), long-chain dicarboxylic acids (LCDAs) being directly produced by microorganisms, and indirectly produced unsaturated short-chain acids (USCA), as well as polymers. Key recovery techniques for carboxylic acids in solution include liquid-liquid extraction, adsorption, and membrane separations. The route toward USCA is discussed, including their production by thermal treatment of intracellular polyhydroxyalkanoates (PHA) polymers and the downstream separations. Polymers included in this review are extracellular polymeric substances (EPS). Strategies for fractionation of the different fractions of EPS are discussed, aiming at the valorization of both polysaccharides and proteins. It is concluded that several separation strategies have the potential to further develop the wastewater valorization chains.

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Dmitrović, Selena, Ivana Pajčin, Vanja Vlajkov, Mila Grahovac, Aleksandar Jokić, and Jovana Grahovac. "Dairy and Wine Industry Effluents as Alternative Media for the Production of Bacillus-Based Biocontrol Agents." Bioengineering 9, no. 11 (November 8, 2022): 663. http://dx.doi.org/10.3390/bioengineering9110663.

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Food industry effluents represent one of the major concerns when it comes to environmental impact; hence, their valorization through different chemical and biological routes has been suggested as a possible solution. The vast amount of organic and inorganic nutrients present in food industry effluents makes them suitable substrates for microbial growth. This study suggests two valorization routes for whey as dairy industry effluent and flotation wastewater from the wine industry through microbial conversion to biocontrol agents as value-added products. Cultivations of the biocontrol strain Bacillus sp. BioSol021 were performed in a 16 L bioreactor to monitor the bioprocess course and investigate bioprocess kinetics in terms of microbial growth, sugar substrate consumption and surfactin synthesis, as an antimicrobial lipopeptide. The produced biocontrol agents showed high levels of biocontrol activity against mycotoxigenic strains of Aspergillus flavus, followed by a significant reduction of sugar load of the investigated effluents by the producing microorganisms. With proven high potential of whey and winery flotation wastewater to be used as substrates for microbial growth, this study provides grounds for further optimization of the suggested valorization routes, mostly in terms of bioprocess conditions to achieve maximal techno-economical feasibility, energy saving and maximal reduction of effluents’ organic and inorganic burden.

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Dali, Imen, Abdelrahman T. Abdelwahab, Abdelkarim Aydi, Nouha Fares, Aboulbaba Eladeb, Mondher Hamzaoui, Manef Abderrabba, Marwa A. Abdelfattah, and Arbi Guetat. "Valorization of Lyophilized Olive Mill Wastewater: Chemical and Biochemical Approaches." Sustainability 15, no. 4 (February 12, 2023): 3360. http://dx.doi.org/10.3390/su15043360.

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Lipid composition and antioxidant activity have been carried out in order to valorize the composition of olive mill wastewater extracts with different solvents (supercritical carbon dioxide, n-hexane, dichloromethane and ethanol). The antioxidant activity was evaluated using ABTS (2,2’-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid)) and DPPH (2,2-diphenyl-1-picrylhydrazyl) tests. The total phenolics and flavonoid contents were, also, determined. The chemical composition of the extracted oil was established, respectively, by gas chromatography–flame ionization detector and high-performance liquid chromatography methods. The results showed that the oleic acid and equivalent carbon number of forty-eight were the major compounds of the analyzed oils. Residual olive mill wastewater from the Sousse region displayed the highest DPPH radical-scavenging activity (31.10 ± 0.10 μg/mL). The chemical analysis of extracts of OMWs showed that the n-hexane fraction contained an abundance of oleic acid (61.62%) and an equivalent carbon number of forty-eight (53.14%). The best antioxidant activity was determined for the ethanol fraction (14.5 μg/mL). The final results showed a significant difference and variations in polar and apolar components. Moreover, n-hexane extracts showed high percentages of Monounsaturated fatty acids (MUFA) with 64% of OMWs oil composition and the dichloromethane extracts contained the largest amount of flavonoids (160.30 ± 1.70 mg EQ/g DM).

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Su, Yanyan, Xinyu Zhu, Rusen Zou, and Yifeng Zhang. "The interactions between microalgae and wastewater indigenous bacteria for treatment and valorization of brewery wastewater." Resources, Conservation and Recycling 182 (July 2022): 106341. http://dx.doi.org/10.1016/j.resconrec.2022.106341.

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Chauca, Janina, María Rosales, Diego Muñoz, and Carlos Banchón. "Finding Chemical Pathways Toward the Valorization of Automobile-Service-Station Wastes." KnE Engineering 3, no. 1 (February 11, 2018): 636. http://dx.doi.org/10.18502/keg.v3i1.1467.

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Automobile-service-station wastes make for an acute environmental concern because they contain polyaromatic hydrocarbons, heavy metals, surfactants, and other harmful elements. An eco-friendly way to treat and take advantage of these wastes is embodied in the concept called "valorization". In the present work, valorization is described as a chemical process to remove solids from contaminated water and to stabilize oily sludge into a saponified product. Electrocoagulation and coagulation with aluminum were applied to separate oil-water emulsions and removed 99.7% of turbidity. Both coagulation processes obtained approximately 0.85 kg of treated water and 0.027 kg of dried oily sludge per kg of wastewater. A saponification process with dosages of 10% NaOH stabilized the dried oily sludge. In hopes of finding pathways to valorize wastes, chemical treatments with aluminum and NaOH obtained a product that can be used as a surfactant or as an energy source.Keywords: sludge, electrocoagulation, saponification, oil, wastewater

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31

Barros, Raúl, Sara Raposo, Etiele G. Morais, Brígida Rodrigues, Valdemira Afonso, Pedro Gonçalves, José Marques, et al. "Biogas Production from Microalgal Biomass Produced in the Tertiary Treatment of Urban Wastewater: Assessment of Seasonal Variations." Energies 15, no. 15 (August 5, 2022): 5713. http://dx.doi.org/10.3390/en15155713.

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The valorization of microalgal biomass produced during wastewater treatment has the potential to mitigate treatment costs. As contaminated biomass (e.g., with pharmaceuticals, toxic metals, etc.) is often generated, biogas production is considered an effective valorization option. The biomass was obtained from a pilot facility of photobioreactors for tertiary wastewater treatment. The pilots were run for one year with naturally formed microalgal consortia. The biogas was generated in 70 mL crimp-top vials at 35 °C, quantified with a manometer and the methane yield measured by gas chromatography. A maximum biogas production of 311 mL/g volatile solids (VS) with a methane yield of 252 mL/g VS was obtained with the spring samples. These rather low values were not improved using previous thermo-acidic hydrolysis, suggesting that the low intrinsic biodegradable organic matter content of the consortia might be the cause for low yield. Considering the total volume of wastewater treated by this plant and the average amount of methane produced in this study, the substitution of the current tertiary treatment with the one here proposed would reduce the energy consumption of the plant by 20% and create an energy surplus of 2.8%. The implementation of this system would therefore contribute towards meeting the ambitious decarbonization targets established by the EU.

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32

Feitosa, Maria C. A., Sílvio R. M. Ferreira, João M. P. Q. Delgado, Fernando A. N. Silva, Joaquim T. R. Oliveira, Pedro E. S. Oliveira, and António C. Azevedo. "Sewage Sludge Valorization for Collapsible Soil Improvement." Buildings 13, no. 2 (January 24, 2023): 338. http://dx.doi.org/10.3390/buildings13020338.

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The environmental problems caused by sewage sludge generated by the growth of the global population and urbanization are drawing the attention of the scientific community worldwide to the need of developing sustainable solutions to use that material. This work investigated the possibilities of using sewage sludge, generated in wastewater treatment plants, as a strategy to improve and stabilize collapsible soils. Different soil–sludge mixtures, with 5%, 10%, and 15% of sludge, were analyzed. For the characterization and analysis of the soil–sludge interaction, physical, chemical, and edometric experiments were performed. The results showed that the addition of sludge to the soil causes a void index reduction, improves particle packaging, and reduces soil collapsibility to the same specific dry apparent weights, i.e., showed to be a promising method for the improvement of collapsible soils.

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33

Cuciureanu, Adriana, Georgiana Cernica, Bogdan Adrian Stanescu, and Ioana Alexandra Ionescu. "Approaches Regarding Red Mud Valorization for a Green Future and Sustainable Environment." Revista de Chimie 71, no. 1 (February 7, 2020): 51–56. http://dx.doi.org/10.37358/rc.20.1.7810.

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Today the red mud generated from alumina production is a resource, a material that can be valorized, an opportunity. The current practice in waste management in some parts of the planet has to be revised. We need to change technologies and become more aware and thoughtful on our footprint on Earth. Red mud is the main waste generated from the bauxite Bayer process. Having a complex composition with predominantly Al2O3 (14-27%), Fe2O3 (19-56%) contents, viable solutions were sought for the reuse of the red mud. A number of applications have resulted in the recovery of metallic components, chemical industry, and building materials industry. A field of red mud applicability, which has enabled the development of innovative and sustainable techniques, is that of the environment. The paper presents the results of the researches carried out in order to valorize the red mud in the treatment of two categories of wastewater: phosphates waters and mine waters. The influence of the experimental parameters on the pollutant removal efficiencies in these wastewaters is highlighted.

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34

Bulgariu, Laura, Igor Cretescu, Dumitru Bulgariu, and Matei Macoveanu. "Valorization of Low-Cost Natural Materials in Depollution Processes of Wastewater." Chemistry Journal of Moldova 9, no. 1 (June 2014): 53–58. http://dx.doi.org/10.19261/cjm.2014.09(1).06.

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35

Gondi, Rashmi, S. Kavitha, R. Yukesh Kannah, Gopalakrishnan Kumar, and J. Rajesh Banu. "Wastewater based microalgae valorization for biofuel and value-added products recovery." Sustainable Energy Technologies and Assessments 53 (October 2022): 102443. http://dx.doi.org/10.1016/j.seta.2022.102443.

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36

Kundu, Debajyoti, Deblina Dutta, Palas Samanta, Sukhendu Dey, Knawang Chhunji Sherpa, Sunil Kumar, and Brajesh Kumar Dubey. "Valorization of wastewater: A paradigm shift towards circular bioeconomy and sustainability." Science of The Total Environment 848 (November 2022): 157709. http://dx.doi.org/10.1016/j.scitotenv.2022.157709.

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37

Costa, Carolina F. F. A., Catarina L. Amorim, Anouk F. Duque, Maria A. M. Reis, and Paula M. L. Castro. "Valorization of wastewater from food industry: moving to a circular bioeconomy." Reviews in Environmental Science and Bio/Technology 21, no. 1 (December 2, 2021): 269–95. http://dx.doi.org/10.1007/s11157-021-09600-1.

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38

Panepinto, Deborah, and Giuseppe Genon. "PERSPECTIVES FOR ENERGETIC VALORIZATION OF WASTEWATER SEWAGE SLUDGE: THE TURIN CASE." Environmental Engineering and Management Journal 13, no. 7 (2014): 1679–86. http://dx.doi.org/10.30638/eemj.2014.186.

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39

Marques, Isabel, Luís Gil, and Francesco La Cara. "Energetic and biochemical valorization of cork boiling wastewater by anaerobic digestion." Biotechnology for Biofuels 7, no. 1 (2014): 67. http://dx.doi.org/10.1186/1754-6834-7-67.

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40

Panepinto, Deborah, Silvia Fiore, Giuseppe Genon, and Marco Acri. "Thermal valorization of sewer sludge: Perspectives for large wastewater treatment plants." Journal of Cleaner Production 137 (November 2016): 1323–29. http://dx.doi.org/10.1016/j.jclepro.2016.08.014.

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41

Mekki, Houda, Michael Anderson, Mourad Benzina, and Emna Ammar. "Valorization of olive mill wastewater by its incorporation in building bricks." Journal of Hazardous Materials 158, no. 2-3 (October 30, 2008): 308–15. http://dx.doi.org/10.1016/j.jhazmat.2008.01.104.

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42

Papadaki, Eugenia, and Fani Th Mantzouridou. "Current status and future challenges of table olive processing wastewater valorization." Biochemical Engineering Journal 112 (August 2016): 103–13. http://dx.doi.org/10.1016/j.bej.2016.04.008.

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43

Magdich, Salwa, Béchir Ben Rouina, and Emna Ammar. "Olive Mill Wastewater Agronomic Valorization by its Spreading in Olive Grove." Waste and Biomass Valorization 11, no. 4 (October 5, 2018): 1359–72. http://dx.doi.org/10.1007/s12649-018-0471-y.

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44

Lemonidis, Ioannis, Dimitra C. Banti, Christos A. Tzenos, Sotirios D. Kalamaras, Thomas A. Kotsopoulos, and Petros Samaras. "Energy Valorization of Fine Screenings from a Municipal Wastewater Treatment Plant." Energies 15, no. 21 (November 4, 2022): 8236. http://dx.doi.org/10.3390/en15218236.

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The aim of this paper was to evaluate the characteristics and the energy potential for the methane production of fine screenings collected from the primary stage of a municipal wastewater treatment plant, and assess the impact on the properties and the oxygen demand of the aqueous effluents downstream from the sieves. Commercial filter bags with sieve openings of 3000, 1250, 1000, and 300 μm were used for the collection of screenings following a measurement of their biochemical methane potential. It was revealed that solid fractions from the sieves with a large size presented a high net methane production capacity exceeding 900 mL/g VS, but the gas production rate was rather slow, requiring a long time to reach the final value. However, cumulative solid fractions containing particles with a size larger than 300 μm had a lower net methane production, about 700 mL/g VS, but with a faster rate, resulting in almost 80% of the total volume released in 30 days. Aqueous samples downstream from the sieves presented decreasing organic matter content by sieve size and reduced the requirements for aeration oxygen. The installation of fine sieves in existing municipal wastewater treatment plants, therefore, may be beneficial due to the enhancement of biogas production and a reduction in the oxygen consumption of the activated sludge process.

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45

El-Khateeb, M. A., and Amal Abdelfattah Khedr. "Valorization of olive mill wastewater using physical, chemical, and biological treatment." DESALINATION AND WATER TREATMENT 280 (2022): 1–8. http://dx.doi.org/10.5004/dwt.2022.29030.

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46

Cui, Zhenzhen, Wenguang Wang, Yong Lin, Min Hu, Yuebiao Li, Boyu Pan, Ming Tan, and Yang Zhang. "Simultaneous ion fractionation and concentration by selectrodialysis for saline wastewater valorization." Desalination 554 (May 2023): 116489. http://dx.doi.org/10.1016/j.desal.2023.116489.

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47

Albolafio, Sofía, María I. Gil, Ana Allende, and Epameinondas Xanthakis. "Potential of Wastewater Valorization after Wet Extraction of Proteins from Faba Bean and Pea Flours." Recent Progress in Materials 03, no. 02 (December 20, 2020): 1. http://dx.doi.org/10.21926/rpm.2102013.

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The present study aimed to characterize wastewater fractions obtained after the wet extraction of proteins from legumes. In addition, the suitability of wastewater fractions for the potential recovery of high value-added compounds was also examined, and consequently, the prevention of the environmental impact of these wastes was explored. Similar to the industrial production of proteins, wet alkaline and acidic extractions of proteins from faba bean and pea flours were performed in two stages of extraction. The different wastewater fractions were characterized by measuring their organic matter content, total solids (TS), total dissolved solids (TDS), electrical conductivity (EC), pH, and turbidity. The value-added compounds from these wastewater fractions were quantified, which included the protein content, carbohydrate content, phenolic content, and antioxidant activity. In addition, the phenolic compounds in these factions were identified and quantified. It was observed that the fractions obtained in the first extraction stage had 60%–90% higher organic matter content, measured as the chemical oxygen demand (COD), compared to the second fractions, indicating a higher environmental impact of the former in case of disposal. The results obtained for COD, TS, TDS, EC, pH, and turbidity demonstrated that microfiltration reduced only the turbidity (85%), and consequently, a decrease was observed in the particulate matter, while there was a practically negligible reduction in the soluble matter. Wastewater from faba exhibited the highest polyphenol content and antioxidant activity, and was, therefore, considered the most valuable fraction for potential valorization.

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48

Meneses-Jácome, A., A. Osorio-Molina, R. Parra-Saldívar, D. Gallego-Suárez, H. I. Velásquez-Arredondo, and A. A. Ruiz-Colorado. "LCA applied to elucidate opportunities for biogas from wastewaters in Colombia." Water Science and Technology 71, no. 2 (December 9, 2014): 211–19. http://dx.doi.org/10.2166/wst.2014.477.

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Biogas produced in municipal and industrial wastewater treatment facilities (BWWF) is a resource wasted in several socio-economic contexts. BWWF-based projects are compared against energy projects using conventional electricity or natural gas (NG), following strict economic considerations that usually tip the balance in favour of conventional energy supply. This is because the economic gain associated with the environmental benefits of using small biogas sources like BWWF does not overcome the technical and financial effort required in these types of project. This paper shows a broader application of life cycle assessment (LCA) methodology to explore opportunities for positive (or effective) utilization of BWWF in the Colombian context. LCA has been used to evaluate the supply-chain of NG which is the direct competitor of BWWF, in three different Colombian regions, in order to identify those where higher NG environmental impacts offer increased environmental added-value to BWWF use. LCA was also applied to study two BWWF valorization scenarios in the poultry processing industry. It shows how valorization options for BWWF are more realistic and effective when specific-regional loads are applied to the environmental assessment of NG supply-chain and BWWF valorization.

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49

Costa, Fiammetta, Alessandra Amati, Manuela Antonelli, Giacomo Cocetta, Michele Di Mauro, Antonio Ferrante, Klaudia Krasojevic, et al. "Designing the Future: An Intelligent System for Zero-Mile Food Production by Upcycling Wastewater." Proceedings 2, no. 22 (November 21, 2018): 1367. http://dx.doi.org/10.3390/proceedings2221367.

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The project deals with the environmental problem of water consumption. The aim of this work is to experiment the recycling of dishwasher wastewater through its reuse in growing edible vegetables or ornamental plants; this can also accomplish the valorization of nutrients present in the wastewater. This new process allows to ensure washing functions coupled with vegetables production and to affect users’ environmental awareness and habits, following a user-centered system design approach to understand the users and involve them actively in the system development. The presented work is also aimed to experiment a multidisciplinary approach in order to face environmental problems.

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50

Silva, Carla. "Greenhouse Gas Emission Assessment of Simulated Wastewater Biorefinery." Resources 10, no. 8 (July 28, 2021): 78. http://dx.doi.org/10.3390/resources10080078.

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A wastewater treatment plant (WWTP) can be considered a system where dirty water enters and fresh water (by means of treatment processes) and other co-products such as sludge and biogas exit. Inside the system, typically, the following steps occur: preliminary treatment, primary treatment, secondary treatment, tertiary treatment, disinfection, and solids handling. The system transforms biomass into several energy and non-energy products, which fall into the definition of a biorefinery. This research compares three simulated WWTP in terms of their environmental greenhouse gas (GHG) emission release to the atmosphere: a generic one (without co-product valorization), one that converts co-products into fertilizer, heat, and electricity, and a third one that converts co-products into heat, electricity, fertilizer, and bioplastic. Heat and electricity are used to provide its energy needs. The chosen impact category is GHG, and the aim is to project the best scenario to the European context in terms of GHG avoidance (savings). The scope is the upstream electricity and natural gas production, the in-use emissions, and the avoided emissions by substituting equivalent fossil-based products. The functional unit is 1 L of sewage (“dirty water”). The GHG savings are evaluated by comparing a generic WWTP scenario, without co-product valorization, with alternative scenarios of co-product valorization. Conventional LCA assuming all the emissions occurs at instant zero is compared to a more realistic environment where for each year, the average of the variable emission pulses occurs. Variable emissions pulses are taken from variable inflows data publicly available from European COST actions (COST Action 682 “Integrated Wastewater Management” as well as within the first IAWQ (later IWA) Task Group on respirometry-based control of the activated sludge process), within the later COST Action 624 on “Optimal Management of Wastewater Systems”). The GHG uncertainty is estimated based on the inputs benchmark data from the WWTP literature and by having different available global warming potential dynamic models. The conventional LCA versus dynamic LCA approach is discussed especially because a WWTP is by nature a dynamic system, having variable inputs along time and therefore variable output GHG emission pulses. It is concluded that heat needs are fully covered by biogas production in the anaerobic digester and combustion, covering its own energy needs and with a potential for heat district supply. Only 30–40% of electricity needs are covered by combined heat and power. Bioplastics and/or fertilizer yields potentially represent less than 3% of current European needs, which suggests the need to reduce their consumption levels. In comparison to generic WWTP, GHG savings are 20%, considering the uncertainty in the benchmark input assumptions. The former is much higher than the uncertainty in the dynamic global warming potential model selection, which means that the model selection is not important in this case study.

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