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Journal ArticleDOI

Anaerobic degradation of naphthalene by the mixed bacteria under nitrate reducing conditions.

15 Jun 2009-Journal of Hazardous Materials (Elsevier)-Vol. 165, Iss: 1, pp 325-331
TL;DR: The results showed that the mixed bacteria could degrade nearly all the naphthalene over the incubations of 25 days when the initial naphthaene concentration was below 30 mg/L, and the degradation rates of nphthalene increased with increasing initial concentrations.
About: This article is published in Journal of Hazardous Materials.The article was published on 2009-06-15. It has received 63 citations till now. The article focuses on the topics: Naphthalene & Nitrite.
Citations
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Journal ArticleDOI
TL;DR: This review aims to discuss PAH degradation under various redox potential conditions, the factors affecting the biodegradation rates, degrading bacteria, the relevant genes in molecular monitoring methods, and some recent-year bioremediation field studies.
Abstract: Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the natural environment and easily accumulate in soil and sediment due to their low solubility and high hydrophobicity, rendering them less available for biological degradation. However, microbial degradation is a promising mechanism which is responsible for the ecological recovery of PAH-contaminated soil and sediment for removing these recalcitrant compounds compared with chemical degradation of PAHs. The goal of this review is to provide an outline of the current knowledge of biodegradation of PAHs in related aspects. Over 102 publications related to PAH biodegradation in soil and sediment are compiled, discussed, and analyzed. This review aims to discuss PAH degradation under various redox potential conditions, the factors affecting the biodegradation rates, degrading bacteria, the relevant genes in molecular monitoring methods, and some recent-year bioremediation field studies. The comprehensive understanding of the bioremediation kinetics and molecular means will be helpful for optimizing and monitoring the process, and overcoming its limitations in practical projects.

189 citations


Cites background from "Anaerobic degradation of naphthalen..."

  • ...The highest degradation rate of 1,434 μg/l/day was achieved by a mixed bacterial culture with the initial cell densities of 1×10(7) cells/ml (Dou et al. 2009)....

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  • ...The highest degradation rate of 1434 μg/l/d was achieved by a mixed bacterial culture with the initial cell densities of 1×107 cells/ml (Dou et al. 2009)....

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  • ...1998), soil (Eriksson et al. 2003; Dou et al. 2009), and sludge (Chang et al....

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  • ...Quite a number of studies were conducted to apply nitrate in remediation of sediment (McNally et al. 1998), soil (Eriksson et al. 2003; Dou et al. 2009) and sludge (Chang et al. 2003) by enriched cultures or pure cultures....

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Journal ArticleDOI
TL;DR: The biodegradation experiment proved that the sediment collected at a depth of 10-15 cm harbored anaerobic PAH-degrading bacterial strains with some intrinsic potential to degrade mixed PAHs consisting of fluorene, phenanthrene, fluoranthene and pyrene under low oxygen and non-oxygen conditions.

101 citations


Cites result from "Anaerobic degradation of naphthalen..."

  • ...The spiked PAH concentration was comparable to that used by previous researchers (Santos et al., 2008; Chupungars et al., 2009; Dou et al., 2009)....

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Journal ArticleDOI
TL;DR: In this article, the degradation of polycyclic aromatic hydrocarbons (PAHs) has been extensively studied in various ecosystems including air, soil, marine water and sediments.

93 citations

Journal ArticleDOI
TL;DR: The genes involved in the degradation of several kinds of aromatic compounds were significantly enriched after nitrate injection, especially those encoding enzymes for central catabolic pathways of aromatic compound degradation, and most of the enriched genes were derived from nitrate-reducing microorganisms, possibly accelerating bioremediation of aromatic-contaminated sediments.
Abstract: A high number of aromatic compounds that have been released into aquatic ecosystems have accumulated in sediment because of their low solubility and high hydrophobicity, causing significant hazards to the environment and human health. Since nitrate is an essential nitrogen component and a more thermodynamically favorable electron acceptor for anaerobic respiration, nitrate-based bioremediation has been applied to aromatic-contaminated sediments. However, few studies have focused on the response of aromatic-degrading microbial communities to nitrate addition in anaerobic sediments. Here we hypothesized that high nitrate inputs would stimulate aromatic-degrading microbial communities and their associated degrading processes, thus increasing the bioremediation efficiency in aromatic compound-contaminated sediments. We analyzed the changes of key aromatic-degrading genes in the sediment samples from a field-scale site for in situ bioremediation of an aromatic-contaminated creek in the Pearl River Delta before and after nitrate injection using a functional gene array. Our results showed that the genes involved in the degradation of several kinds of aromatic compounds were significantly enriched after nitrate injection, especially those encoding enzymes for central catabolic pathways of aromatic compound degradation, and most of the enriched genes were derived from nitrate-reducing microorganisms, possibly accelerating bioremediation of aromatic-contaminated sediments. The sediment nitrate concentration was found to be the predominant factor shaping the aromatic-degrading microbial communities. This study provides new insights into our understanding of the influences of nitrate addition on aromatic-degrading microbial communities in sediments.

64 citations

Book ChapterDOI
TL;DR: This review is intended to provide comprehensive details on microbial degradation of PAHs under various reducing conditions, to describe the degradation mechanisms, and to identify the areas that should receive due attention in further investigations.
Abstract: Polycyclic aromatic hydrocarbons (PAHs) are a class of hazardous organic contaminants that are widely distributed in nature, and many of them are potentially toxic to humans and other living organisms. Biodegradation is the major route of detoxification and removal of PAHs from the environment. Aerobic biodegradation of PAHs has been the subject of extensive research; however, reports on anaerobic biodegradation of PAHs are so far limited. Microbial degradation of PAHs under anaerobic conditions is difficult because of the slow growth rate of anaerobes and low energy yield in the metabolic processes. Despite the limitations, some anaerobic bacteria degrade PAHs under nitrate-reducing, sulfate-reducing, iron-reducing, and methanogenic conditions. Anaerobic biodegradation, though relatively slow, is a significant process of natural attenuation of PAHs from the impacted anoxic environments such as sediments, subsurface soils, and aquifers. This review is intended to provide comprehensive details on microbial degradation of PAHs under various reducing conditions, to describe the degradation mechanisms, and to identify the areas that should receive due attention in further investigations.

62 citations

References
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Journal ArticleDOI
TL;DR: Use of DAPI improved visualization and counting of <1-µm bacteria and blue-green algae in seston-rich samples and extended sample storage to at least 24 weeks.
Abstract: A highly specific and sensitive fluorescing DNA stain, 4′6-diamidino-2-phenylindole (DAPI) was compared with acridine orange (AO) for counting aquatic microflora. Use of DAPI improved visualization and counting of <1-µm bacteria and blue-green algae in seston-rich samples and extended sample storage to at least 24 weeks.

5,119 citations

Journal ArticleDOI
TL;DR: Rates of biodegradation depend greatly on the composition, state, and concentration of the oil or hydrocarbons, with dispersion and emulsification enhancing rates in aquatic systems and absorption by soil particulates being the key feature of terrestrial ecosystems.

2,450 citations

Journal ArticleDOI
TL;DR: In this paper, the authors provide an outline of the microbial degradation of polycyclic aromatic hydrocarbons, including bacteria, fungi and algae, and the biochemical principles underlying the degradation.
Abstract: The intent of this review is to provide an outline of the microbial degradation of polycyclic aromatic hydrocarbons. A catabolically diverse microbial community, consisting of bacteria, fungi and algae, metabolizes aromatic compounds. Molecular oxygen is essential for the initial hydroxylation of polycyclic aromatic hydrocarbons by microorganisms. In contrast to bacteria, filamentous fungi use hydroxylation as a prelude to detoxification rather than to catabolism and assimilation. The biochemical principles underlying the degradation of polycyclic aromatic hydrocarbons are examined in some detail. The pathways of polycyclic aromatic hydrocarbon catabolism are discussed. Studies are presented on the relationship between the chemical structure of the polycyclic aromatic hydrocarbon and the rate of polycyclic aromatic hydrocarbon biodegradation in aquatic and terrestrial ecosystems.

1,839 citations

Journal ArticleDOI
TL;DR: Interest in the biodegradation mechanisms and environmental fate of polycyclic aromatic hydrocarbons is prompted by their ubiquitous distribution and their potentially deleterious effects on human health.
Abstract: Interest in the biodegradation mechanisms and environmental fate of polycyclic aromatic hydrocarbons (PAHs) is prompted by their ubiquitous distribution and their potentially deleterious effects on human health. PAHs constitute a large and diverse class of organic compounds and are generally

1,125 citations