Journal ArticleDOI
Biodegradation of aromatic compounds under mixed oxygen/denitrifying conditions : a review
L.P. Wilson,Edward J. Bouwer +1 more
TLDR
Evidence is presented of the effectiveness of bioremediation under mixed oxygen/nitrate conditions under some critical oxygen threshold, however high levels of oxygen inhibit denitrification.Abstract:
Bioremediation of aromatic hydrocarbons in groundwater and sediments is often limited by dissolved oxygen. Many aromatic hydrocarbons degrade very slowly or not at all under anaerobic conditions. Nitrate is a good alternative electron acceptor to oxygen, and denitrifying bacteria are commonly found in the subsurface and in association with contaminated aquifer materials. Providing both nitrate and microaerophilic levels of oxygen may result in oxidation of the stable benzene rings in aromatic contaminants and allow for the intermediates of this oxidation to degrade via denitrification. The effects of using mixed electron acceptors on biodegradation of subsurface contaminants is unclear. Below some critical oxygen threshold, aerobic biodegradation is inhibited, however high levels of oxygen inhibit denitrification. The mechanisms which regulate electron transfer to oxygen and nitrate are complex. This review: 1) describes the factors which may affect the utilization of oxygen and nitrate as dual electron acceptors during biodegradation; 2) summarizes the incidence of dual use of nitrate and oxygen (aerobic denitrification); and 3) presents evidence of the effectiveness of bioremediation under mixed oxygen/nitrate conditions.read more
Citations
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Journal Article
Polymer Biodegradation and Biodegradable Polymers - a Review
TL;DR: A review of biodegradable polymers can be found in this article, which describes biodegradation processes of xenobiotics such as aromatic compounds, plastics (PVA, polyesters, polyethylene, and nylon), and polymer blends (Starch/Polyethylene).
Journal Article
Microbial communities associated with anaerobic benzene degradation in a petroleum-contaminated aquifer
TL;DR: In this paper, the authors investigated the microbial community composition associated with benzene degradation under in situ Fe(III)-reducing conditions in a petroleum-contaminated aquifer located in Bemidji, Minnesota.
Journal ArticleDOI
Microbial Communities Associated with Anaerobic Benzene Degradation in a Petroleum-Contaminated Aquifer
Juliette N. Rooney-Varga,Robert T. Anderson,Jocelyn L. Fraga,David B. Ringelberg,Derek R. Lovley +4 more
TL;DR: Results suggest that Geobacter spp.
Journal ArticleDOI
In situ bioremediation of monoaromatic pollutants in groundwater : A review
TL;DR: Results published indicate that in some sites, intrinsic bioremediation can reduce the monoaromatic compounds content of contaminated water to reach standard levels of potable water, however, engineering biOREmediation is faster and more efficient.
Journal ArticleDOI
Monitoring and assessing processes of organic chemicals removal in constructed wetlands
TL;DR: This review summarizes the recent progress made towards understanding how the various mechanisms attributed to organic chemicals removal interact to form a functioning wetland and discusses the main degradation pathways for different groups of contaminants.
References
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Book
Introduction to soil microbiology
TL;DR: In this paper, the biological processes that take place in the soil and their importance to soil fertility, plant growth, and environmental quality are investigated from both descriptive and functional viewpoints, including microbial ecology, the carbon and nitrogen cycles, mineral transformation, and ecological interrelationships.
Journal ArticleDOI
Groundwater contamination: pump-and-treat remediation
Douglas M. Mackay,John A. Cherry +1 more
TL;DR: In this paper, the authors explore reasons for the observed difficulty of groundswater cleanup and note some implications that become clear during this process, focusing mainly on organic contaminants, the most health-threatening chemicals detected in groundwater and because the greatest difficulties in groundwater remediation have been encountered at organic contamination sites.
Journal ArticleDOI
The biodegradation of aromatic hydrocarbons by bacteria
TL;DR: The biodegradation of benzene, certain arenes, biphenyl and selected fused aromatic hydrocarbons, by single bacterial isolates, are dealt with in detail.
Book ChapterDOI
Microbial metabolism of polycyclic aromatic hydrocarbons.
TL;DR: Studies on PAH metabolism are entering a new era; biochemical genetic techniques such as gene cloning and transposon mutagenesis will provide new insight into the biochemistry and regulation of PAH degradative pathways.
Book ChapterDOI
Fate of polynuclear aromatic compounds (PNAs) in soil-plant systems
TL;DR: A polycyclic aromatic hydrocarbons (PAH) as discussed by the authors consist of three or more fused benzene rings in linear, angular, or cluster arrangements, which can be substituted by a variety of substituents.