Academic literature on the topic 'Metal-reducing microorganisms'
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Journal articles on the topic "Metal-reducing microorganisms"
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Kashefi, Kazem, Jason M. Tor, Kelly P. Nevin, and Derek R. Lovley. "Reductive Precipitation of Gold by Dissimilatory Fe(III)-Reducing Bacteria andArchaea." Applied and Environmental Microbiology 67, no. 7 (July 1, 2001): 3275–79. http://dx.doi.org/10.1128/aem.67.7.3275-3279.2001.
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ABSTRACT Studies with a diversity of hyperthermophilic and mesophilic dissimilatory Fe(III)-reducing Bacteria andArchaea demonstrated that some of these organisms are capable of precipitating gold by reducing Au(III) to Au(0) with hydrogen as the electron donor. These studies suggest that models for the formation of gold deposits in both hydrothermal and cooler environments should consider the possibility that dissimilatory metal-reducing microorganisms can reductively precipitate gold from solution.
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Beech, Iwona B., and Christine C. Gaylarde. "Recent advances in the study of biocorrosion: an overview." Revista de Microbiologia 30, no. 3 (July 1999): 117–90. http://dx.doi.org/10.1590/s0001-37141999000300001.
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Biocorrosion processes at metal surfaces are associated with microorganisms, or the products of their metabolic activities including enzymes, exopolymers, organic and inorganic acids, as well as volatile compounds such as ammonia or hydrogen sulfide. These can affect cathodic and/or anodic reactions, thus altering electrochemistry at the biofilm/metal interface. Various mechanisms of biocorrosion, reflecting the variety of physiological activities carried out by different types of microorganisms, are identified and recent insights into these mechanisms reviewed. Many modern investigations have centered on the microbially-influenced corrosion of ferrous and copper alloys and particular microorganisms of interest have been the sulfate-reducing bacteria and metal (especially manganese)-depositing bacteria. The importance of microbial consortia and the role of extracellular polymeric substances in biocorrosion are emphasized. The contribution to the study of biocorrosion of modern analytical techniques, such as atomic force microscopy, Auger electron, X-ray photoelectron and Mössbauer spectroscopy, attenuated total reflectance Fourier transform infrared spectroscopy and microsensors, is discussed.
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Kalashnikova, O. B., A. V. Kashevskii, N. S. Vardanyan, D. Erdenechimeg, G. O. Zhdanova, I. A. Topchy, O. N. Ponamoreva, O. F. Vyatchina, and D. I. Stom. "Acidophilic chemolithotrophic microorganisms: prospects for use in biohydrometallurgy and microbial fuel cells." Proceedings of Universities. Applied Chemistry and Biotechnology 11, no. 1 (April 6, 2021): 34–52. http://dx.doi.org/10.21285/2227-2925-2021-11-1-34-52.
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Acidophilic chemolithotrophic microorganisms are used in biohydrometallurgy for the extraction of metals from sulphide ores. Some types of microorganisms belonging to this group are capable of generating electricity under certain conditions. This circumstance determined a recent upsurge of research interest in their use in biofuel cells. Under a constant supply of the substrate to the bioelectrochemical system, acidophilic chemolithotrophic microorganisms are capable of producing electricity for a prolonged period of time. The use of extremophiles in microbial fuel cells is of particular interest, since these microorganisms can serve as bioelectrocatalysts at extreme pH, salinity and temperature, while the vast majority of microorganisms are unable to survive under these conditions. Therefore, selection of optimal conditions and approaches to controlling the work of acidophilic chemolithotrophic microorganisms in such fuel cells is of particular importance. On this basis, a technology for the simulteneous bioleaching of metals from poor ores and the generation of electricity can be developed. Biofuel cells operating at low pH values using acidophilic chemolithotrophic microorganisms are yet to be investigated. The number of studies on acidophilic electroactive microorganisms is very limited. In this regard, the purpose of this review was to consider the prospects for the use of acidophilic chemolithotrophic microorganisms as bioagents in microbial fuel cells. The reviewed publications demonstrate that chemolithotrophic microorganisms can act as both anodic (metal-reducing, sulphur-oxidizing microorganisms) and cathodic (metal-oxidizing prokaryotes, sulfate reducers) highly efficient bioagents capable of using mining wastes as substrates.
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Roh, Y., H. Vali, T. J. Phelps, and J. W. Moon. "Extracellular Synthesis of Magnetite and Metal-Substituted Magnetite Nanoparticles." Journal of Nanoscience and Nanotechnology 6, no. 11 (November 1, 2006): 3517–20. http://dx.doi.org/10.1166/jnn.2006.17973.
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We have developed a novel microbial process that exploits the ability of Fe(III)-reducing microorganisms to produce copious amounts of extracellular magentites and metal-substituted magnetite nanoparticles. The Fe(III)-reducing bacteria (Theroanaerobacter ethanolicus and Shewanella sp.) have the ability to reduce Fe(III) and various metals in aqueous media and form various sized magnetite and metal-substituted magnetite nano-crystals. The Fe(III)-reducing bacteria formed metal-substituted magnetites using iron oxide plus metals (e.g., Co, Cr, Mn, Ni) under conditions of relatively low temperature (<70 °C), ambient pressure, and pH values near neutral to slightly basic (pH = 6.5 to 9). Precise biological control over activation and regulation of the biosolid-state processes can produce magnetite particles of well-defined size (typically tens of nanometers) and crystallographic morphology, containing selected dopant metals into the magnetite (Fe3−yXyO4) structure (where X = Co, Cr, Mn, Ni). Magnetite yields of up to 20 g/L per day have been observed in 20-L vessels. Water-based ferrofluids were formed with the nanometer sized, magnetite, and metal-substituted biomagnetite particles.
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Schippers, Axel, and Dagmar Kock. "Geomicrobiology of Sulfidic Mine Dumps: A Short Review." Advanced Materials Research 71-73 (May 2009): 37–41. http://dx.doi.org/10.4028/www.scientific.net/amr.71-73.37.
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The geomicrobiology of sulfidic mine dumps is reviewed. More than 30 microbiological studies of sulfidic mine dumps have been published. Mainly culturing approaches such as most probable number (MPN) or agar plates were used to study the microbial communities. More recently, molecular biological techniques such as FISH, CARD-FISH, Q-PCR, T-RFLP, DGGE, or cloning have been applied to quantify microorganisms and to investigate the microbial diversity. Aerobic Fe(II)- and sulfur compound oxidizing microorganisms oxidize pyrite, pyrrhotite and other metal sulfides and play an important role in the formation of acid mine drainage (AMD). Anaerobic microorganisms such as Fe(III)-reducing microorganisms dissolve Fe(III)(hydr)oxides and may thereby release adsorbed or precipitated metals. Sulfate-reducing microorganisms precipitate and immobilize metals. In addition to the microbial communities several biogeochemical processes have been analyzed in mine dumps. Pyrite or pyrrhotite oxidation rates have been measured by different techniques: Column experiments, humidity cells, microcalorimetry, or oxygen consumption measurements. Analyses of stable isotopes of iron, oxygen and sulfur have yielded valuable information on biogeochemical reactions. The microbiology and the biogeochemical processes in sulfidic mine dumps have to be understood for control and prevention of AMD generation and to provide different possibilities for remediation concepts. Today, remediation measures, e.g. under water storage of the waste or covering of the dumps, focus on the inhibition of pyrite oxidation to keep the toxic compounds inside the mine waste dumps. As an alternative to the inhibition of pyrite oxidation, metals which also have economic value could be extracted from mine dumps by the application of different metal extraction technologies including bioleaching.
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D, Thirumurugan, Ibrahim Adamu Karfi, Vijayakumar R, and Nithya Tg. "AN ALTERNATIVE APPROACH ON BIOREMEDIATION OF HEAVY METALS IN TANNERY EFFLUENTS WASTE USING STREPTOMYCES SP." Asian Journal of Pharmaceutical and Clinical Research 10, no. 10 (September 1, 2017): 323. http://dx.doi.org/10.22159/ajpcr.2017.v10i10.19480.
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Objective: The present study is conducted to investigate the abilities of microorganisms to degrade heavy metals in industrial tannery effluent sample.Methods: Tannery effluent sample was collected from effluent treatment plant and analyzed for physicochemical parameters. The potential microbes were isolated and identified by morphological and biochemical characterization. The sample was analyzed before and after to assess the heavy metal reducing the ability of the microorganism and the respective percentage of reduction were studied using X-ray fluorescence spectrometry.Results: The samples were initially found to be highly contaminated with chromium, nickel, and cadmium. Out of three potential isolates, the isolate Streptomyces sp. was found to exhibit a better reduction against chromium (25.7%), cadmium (14.6%), and nickel (23.1%) in 50 ppm at longer incubation period. Comparatively, the reduction abilities of all the three isolates against all the three heavy metals increased with the increase in the incubation period but decreased with the increase in initial metal ion concentration except in the case of Streptomyces sp. against nickel where the reducing ability increased with the increase in metal concentration.Conclusion: Apparently, the present study revealed that Streptomyces sp. had a better remediation potential than the indigenous Pseudomonas sp. and Aspergillus sp. Ultimately, the finding of this research has shown that the Streptomyces sp. can be used as a potent bioremediation agent for treating tannery and industrial effluent in an eco-friendly process.
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Jiang, Zhou, Meimei Shi, and Liang Shi. "Degradation of organic contaminants and steel corrosion by the dissimilatory metal-reducing microorganisms Shewanella and Geobacter spp." International Biodeterioration & Biodegradation 147 (February 2020): 104842. http://dx.doi.org/10.1016/j.ibiod.2019.104842.
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Bordoloi, Manobjyoti, Ranjan K. Sahoo, Kashyap J. Tamuli, Surovi Saikia, and Partha P. Dutta. "Plant Extracts Promoted Preparation of Silver and Gold Nanoparticles: A Systematic Review." Nano 15, no. 02 (February 2020): 2030001. http://dx.doi.org/10.1142/s1793292020300017.
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Eco-friendly synthesis of metal nanoparticles has accrued utmost interest by researchers in the last decade for their distinct properties making them applicable in different fields of science and technology. With regard to its low cost, low environmental effect, zero contamination and higher reducing potential, their synthesis by green chemistry procedure is an emerging area in nanobiotechnology. Plant-based nanoparticles produced are more stable, with high rate of synthesis and are suitable for large scale biosynthesis as compared to the use of microorganisms which require stringent control on cell cultures. Plant-based nanoparticles have advantages over other methods due to presence of biomolecules acting both as capping and reducing agents by increasing the rate of reduction and stabilization of nanoparticles. Furthermore, secondary metabolites present in plants are used for reducing metal ions in single step reaction. In this review paper, we have cited 265 research articles and have outlined 106 plant extract assisted gold and silver nanoparticles. The present review highlights the achievements of metal nanoparticle synthesis, especially silver and gold nanoparticles from plant extracts, along with factors liable for the synthesis of metal nanoparticles. It also focuses on the dye degrading properties and various biological activities of metal nanoparticles, their antimicrobial mechanism of action and the physicochemical properties that influence the biological effects of metallic nanoparticles. Biological activities of metal nanoparticles were also described, including the effect of physicochemical properties of metal nanoparticles on biological activities.
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Qi, Bei Meng, Bei Jia Wang, Chen Guang Wu, and Yi Xing Yuan. "The Disinfection Efficacy of Chlorine on Sulfate-Reducing Bacteria and Iron Bacteria in Water Supply Systems." Applied Mechanics and Materials 316-317 (April 2013): 657–60. http://dx.doi.org/10.4028/www.scientific.net/amm.316-317.657.
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Sulfate reducing bacteria (SRB) and iron reducing bacteria (IRB) that widely exist in water supply networks are the main microorganisms leading to metal corrosion in pipelines. Chlorine is widely used in drinking water supply systems. The concentration of chlorine with SRB declined rapidly after 10 mins and reached 0 mg/L finally whereas it decreased more slowly with IRB. If the concentration of chlorine is lower than 0.2mg/L, IRB cannot be sterilized. It indicates that at the end of water pipes where the concentration of chlorine is required to be 0.05mg/L, chlorine is not effective since the concentration is below the minimum requirement of removing IRB
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Bahaj, A. S., P. A. B. James, and F. D. Moeschler. "Wastewater treatment by bio-magnetic separation: a comparison of iron oxide and iron sulphide biomass recovery." Water Science and Technology 38, no. 6 (September 1, 1998): 311–17. http://dx.doi.org/10.2166/wst.1998.0266.
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Many microorganisms have an affinity to accumulate metal ions onto their surfaces, which results in metal loading of the biomass. Microbial biomineralisation of iron produces a biomass, which is often highly magnetic and can be separated from water systems by the application of a magnetic field. This paper reports on the magnetic separation of biomass containing microbial iron oxide (Fe3O4, present within magnetotactic bacteria) and iron sulphide (Fe1-XS, precipitated extracellularly by sulphate reducing bacteria) in a single wire cell. Since such bacteria can be separated magnetically, their affinity to heavy metal or organic material accumulation renders them useful for the removal of pollutants from wastewater. The relative merits of each bacterium to magnetic separation techniques in terms of applied magnetic field and processing conditions are discussed.
Dissertations / Theses on the topic "Metal-reducing microorganisms"
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Yacob, Shahrakbah, and n/a. "Metal-reducing microorganisms in petroleum reservoirs." University of Canberra. Resource & Environmental Science, 2000. http://erl.canberra.edu.au./public/adt-AUC20061112.102729.
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Metal-reducing microorganisms reduce a variety of metals in metabolic processes
coupled to the oxidation of organic compounds. These bacteria play an important role
in the biogeochemical cycling of metals and organic matter in anaerobic aquatic and
sediment ecosystems. It has been proposed recently that metal-reducing
microorganisms also are active in deep subsurface environments such as petroleum
reservoirs. Only two metal-reducing bacteria have been isolated from petroleum
reservoir fluids, Shewanella putrefaciens and Deferribacter thermophilus. This project
studied the occurrence and distribution of metal-reducing microorganisms in petroleum
reservoirs. The research focused on the isolation, characterisation and identification of
anaerobic bacteria from petroleum reservoirs that were capable of reducing metals and
the potential roles of these isolates in the microbial ecology and biogeochemical cycling
of petroleum reservoirs.
Petroleum reservoirs were selected for this study on the basis of physio-chemical
conditions such as temperature, salinity, pH and the presence of organic and inorganic
compounds, that were likely to provide a suitable environment for anaerobic bacteria
capable of reducing metals. Factors such as the stratigraphic features of the
sedimentary basin, age of reservoir and past oil field practices also were considered in
choosing the reservoir for study. Seven petroleum reservoirs in the USA and
Azerbaijan were chosen for extensive investigations. The physico-chemical conditions
in these reservoirs varied substantially.
A systematic study of the production water from these petroleum reservoirs revealed a
consistent presence of iron- and manganese-reducing microorganisms. It was found
that salinity and temperature play a significant and defining role in the occurrence and
distribution of these metal-reducing microorganisms. Biotic metal reduction was
detected from production waters from all but one of the oil wells sampled. It was
significant that the water from this well (Neftcala #1074) was the most saline (78 g/l
NaCI). Metal-reducing activity was detected at temperatures up to 70°C.
Two pure cultures, strains RED1 for Redwash petroleum reservoir (USA) and NEF1
from the Neftcala petroleum reservoir (Azerbaijan) were isolated and characterized.
The strains had diverse physiological and metabolic properties including the ability to
oxidize a wide range of carbon compounds and reduce a variety of metals. Their
temperature, salinity and pH optima varied markedly. Phylogenetic analyses of the 16S
rRNA of strain RED1 showed that the strain represented a new species of a new genus
in the domain Bacteria. The bacterium most closely related to strain RED1 is the
fermentative Fe(III)-reducer, Pelobacter acetylenicus (similarity value, 92.8%). Strain
NEF1 possesses a unique combination of phenotypic traits and a low mol % G+C.
From preliminary analyses and comparative biochemistry, NEF1 appears to be a novel
metal-reducing bacterium of the Flexistipes group.
The bacteria isolated in this study were able to grow at temperatures and salinities
consistent with the reservoir from which they were isolated. This indicated that
petroleum reservoirs are a new source of physiologically diverse, novel, metal-reducing
microorganisms. The bacteria isolated also demonstrated a number of characteristics
that would enable them to survive and persist in extreme subsurface conditions and
develop a selective ecological advantage in petroleum reservoir environments.
Significantly, the metal-reducing bacteria isolated were able to utilize an array of
metabolic products produced by bacteria indigenous to petroleum reservoirs. This has
resulted in a new proposed model for the ecological succession of bacteria in petroleum
reservoirs.
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Özyurt, Baris. "Identifikation von Genen und Mikroorganismen, die an der dissimilatorischen Fe(III)-Reduktion beteiligt sind." Doctoral thesis, 2009. http://hdl.handle.net/11858/00-1735-0000-0006-B66A-8.
Full textBook chapters on the topic "Metal-reducing microorganisms"
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Lloyd, Jonathan R., Derek R. Lovley, and Lynne E. Macaskie. "Biotechnological Application of Metal-reducing Microorganisms." In Advances in Applied Microbiology Volume 53, 85–128. Elsevier, 2003. http://dx.doi.org/10.1016/s0065-2164(03)53003-9.
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Patra, Biswajit, Saroj Kumar Deep, and Surya Narayan Pradhan. "Different Bioremediation Techniques for Management of Waste Water." In Recent Advancements in Bioremediation of Metal Contaminants, 1–18. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4888-2.ch001.
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Water contamination remains an issue. A combination of biodegradation and nanotechnology is proposed as a potential proficient, minimal effort, and naturally amiable system to deal with it. Among different mediations, bioremediation procedures can conceivably be utilized to decrease the versatility of materials in the subsurface, reducing the potential for human and ecological exposure. The metabolic diversity of microorganisms ensures an assortment of substrates to be expended. Photosynthetic microorganisms have been found as a compelling and eco-friendly species that can remove carbon, nitrogen, and phosphorous in the manufactured sewage and wastewater. This chapter particularly emphasizes environmentally friendly NMs that give information for removing contaminants from wastewater and effluents. Additionally, various nanocomposites and different natural methods utilized in the wastewater treatment process are also briefly discussed.
Conference papers on the topic "Metal-reducing microorganisms"
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Men, Hong, Yan Peng, Jing Zhang, Shanrang Yang, and Zhiming Xu. "Study on Biocorrosion Induced by Sulfate-Reducing Bacteria on Heat Exchanger Material in Cooling Water." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22747.
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Corrosion associated with microorganisms has been recognized for over 50 years and yet the study of microbiologically influenced corrosion (MIC) is relatively new. MIC can occur in diverse environments. Industrial cooling water from rivers, lakes and sea water contain lots of microorganisms which are able to grow and multiply under certain conditions when pH, water temperature and sunlight etc are suitable. MIC is one of key cause of heat exchanger faults. MIC of heat exchanger materials in cooling waters has caused expensive unplanned outages, the need for local repairs and, in some cases, completes system replacement. Sulfate-reducing bacteria (SRB) are the main harmful bacteria in circulating cooling water. Under anaerobic conditions, SRB reproduce a lot to produce mucus, which speed up the formation of corrosion, erode the metal equipment, plug the pipeline, affect the efficiency of heat transfer, and bring a lot of inconvenience to the production. The corrosion behaviors of 304 stainless steel induced by SRB were studied by measuring the polarization curves, electrochemical impedance Spectrum, weight loss measurements of fore-and-aft biocorrosion, and electrochemical noise method. The electrochemical noise signal of 304 stainless steel corrosion were de-noised by using a wavelet threshold de-noising method, which made the quadratic biorthogonal spline wavelet as the mother wavelet and adopted an soft threshold processing function. The result showed that the slope of cathodic polarization curves measured included with SRB is lower than the one obtained without SRB, while the slope of anodic polarization curves is higher than it. It is concluded that the process of anode polarization was repressed at the presence of SRB. With the growth of the culture time, the value of electrochemical impedance without bacteria reduced at first, then rose, while with bacteria fell at all times. It indicated that SRB accelerated the corrosion of stainless steel. With the dipping time, a biofilm, under which corrosion products congregate to form local battery corrosion, was formed on the surface of stainless steel, so that the serious pitting corrosion is induced. The results from electrochemical noise method showed that the quadratic biorthogonal spline wavelet much smoother and it can remove the noise from the electrochemical noise effectively, and can effectively identify the location of the sudden changes in the signal and accurately reflect the useful information of the signal. The more useful information and data about biocorrosion induced by SRB are also gotten.
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Keasler, Vic, Brian Bennett, and Heather McGinley. "Analysis of Bacterial Kill Versus Corrosion From Use of Common Oilfield Biocides." In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31593.
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Bacterial proliferation is a severe problem in many oilfield systems, especially in aging systems with high water cuts. Depending on the types of microorganisms present, they can cause microbiologically influenced corrosion (MIC) or biofouling of filters, membranes, and metal surfaces. Common oilfield bacteria include sulfate-reducing bacteria (SRB) that can generate hydrogen sulfide (H2S) and iron sulfide (FeS) as a by-product (iron sulfide can occur in different structural forms), acid producing bacteria that can secrete organic acids that lower the pH within the microenvironment of a biofilm, as well as general heterotrophic bacteria that are often important in biofilm formation and maintenance, amongst others. To prevent corrosion or biofouling caused by these organisms, biocides are commonly added to the production fluids. Some concern has arisen that common oilfield biocides may be inherently corrosive at high end use concentrations and could cause general corrosion in the assets they are protecting from MIC. Accordingly, it is important to understand the risk of MIC, souring, and biofouling versus general corrosion from the biocides themselves. To examine the killing efficiency of oilfield biocides versus their corrosive potential, laboratory work was undertaken with five biocide products including: Tetrakis (hydroxymethyl) phosphonium sulfate (THPS), glutaraldehyde, glutaraldehyde / alkyldimethylbenzyl ammonium chloride (ADBAC) mixture, 5-chloro-2-methyl-4-isothiazolin-3-one/2-methyl-4-isothiazolin-3-one (CMIT/MIT), and a cocodiamine (quaternary amine). Each biocide was evaluated at four different concentrations ranging from 10–100,000 ppm of product. Killing efficiency was determined via bacterial kill studies, while wheelbox and bubble cell testing examined corrosion rates. Corrosion rates varied quite substantially from one biocide to the next, especially at high concentrations. Some biocides were found to be only mildly corrosive even at high dosages, while other biocides were much more corrosive at high concentrations. In general, it was observed that biocide corrosivity is directly related to the dosage of the biocide, with higher dosages correlating with higher corrosion rates. On the other hand, biocides were shown to be effective at killing common oilfield bacteria at relatively low dosages. This data suggests that biocides can be effective at killing bacteria at concentrations that do not cause significant amounts of general corrosion. Additionally, the common practice of batch treating biocides minimizes contact time between the biocide and the metal surface, which is in turn expected to minimize any corrosion that would otherwise be attributed to the biocides themselves. Taken together, this data would suggest that the benefit of biocide treatment to prevent MIC and biofouling substantially outweighs any potentially negative impact on corrosion.