Novel Chryseobacterium sp. PYR2 degrades various organochlorine pesticides (OCPs) and achieves enhancing removal and complete degradation of DDT in highly contaminated soil

Long term residues of organochlorine pesticides (OCPs) in soils are of great concerning because they seriously threaten food security and human health. This article focuses on isolation of OCP-degrading strains and their performance in bioremediation of contaminated soil under ex situ conditions. A...

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Vydáno v:	Journal of environmental management Ročník 161; s. 350 - 357
Hlavní autoři:	Qu, Jie, Xu, Yang, Ai, Guo-Min, Liu, Ying, Liu, Zhi-Pei
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	England Elsevier Ltd 15.09.2015 Academic Press Ltd
Témata:	Acids Augmentation Bacteria Bacteria - metabolism Biodegradation Biodegradation, Environmental Bioremediation carbon Chlorobenzoates - analysis Chlorobenzoates - metabolism Chryseobacterium Chryseobacterium - metabolism Chryseobacterium sp. PYR2 Cultural change DDD DDD (pesticide) DDE DDE (pesticide) DDT DDT (pesticide) DDT - metabolism Degradation energy Energy sources Ethane Ethylene Experiments Food security gas chromatography-mass spectrometry Gram-negative bacteria HCH HCH (pesticide) Healthy food Hexachlorocyclohexane human health Human security Humans Hydrocarbons, Chlorinated - metabolism Isomerism isomers Metabolites Nitrous oxide Obligatory contour principle Organic compounds Organochlorine pesticides Pesticide residues Pesticides Pesticides - analysis Pesticides - metabolism Phenylacetates - analysis Phenylacetates - metabolism polluted soils Residues Soil (material) Soil contamination Soil Pollutants - analysis Soil Pollutants - metabolism Soils Biodegradation Chryseobacterium sp. PYR2 Bioremediation HCH DDT Organochlorine pesticides
ISSN:	0301-4797, 1095-8630
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Shrnutí:	Long term residues of organochlorine pesticides (OCPs) in soils are of great concerning because they seriously threaten food security and human health. This article focuses on isolation of OCP-degrading strains and their performance in bioremediation of contaminated soil under ex situ conditions. A bacterium, Chryseobacterium sp. PYR2, capable of degrading various OCPs and utilizing them as a sole carbon and energy source for growth, was isolated from OCP-contaminated soil. In culture experiments, PYR2 degraded 80–98% of hexachlorocyclohexane (HCH) or 1,1,1-trichloro-2,2-bis (4-chlorophenyl) ethane (DDT) isomers (50 mg L−1) in 30 days. A pilot-scale ex situ bioremediation study of highly OCP-contaminated soil augmented with PYR2 was performed. During the 45-day experimental period, DDT concentration was reduced by 80.3% in PYR2-augmented soils (35.37 mg kg−1 to 6.97 mg kg−1) but by only 57.6% in control soils. Seven DDT degradation intermediates (metabolites) were detected and identified in PYR2-augmented soils: five by GC/MS: 1,1-dichloro-2,2-bis (4-chlorophenyl) ethane (DDD), 1,1-dichloro-2,2-bis (4-chlorophenyl) ethylene (DDE), 1-chloro-2,2-bis (4-chlorophenyl) ethylene (DDMU), 1-chloro-2,2-bis (4-chlorophenyl) ethane (DDMS), and dichlorobenzophenone (DBP); and two by LC/MS: 4-chlorobenzoic acid (PCBA) and 4-chlorophenylacetic acid (PCPA). Levels of metabolites were fairly stable in control soils but varied greatly with time in PYR2-augmented soils. Levels of DDD, DDMU, and DDE in PYR2-augmented soils increased from day 0 to day 30 and then decreased by day 45. A DDT biodegradation pathway is proposed based on our identification of DDT metabolites in PYR2-augmented systems. PYR2 will be useful in future studies of OCP biodegradation and in bioremediation of OCP-contaminated soils. •A multiple OCPs-degrading strain, Chryseobacterium sp. PYR2, was obtained.•Chryseobacterium members had never been described able to degrade OCPs.•Inoculation of PYR2 into contaminated soil greatly enhanced the removal of DDT.•DDT was subsequently degraded to DDD, DDE, DDMU, DDMS, DBP, PCPA and PCBA.•A complete degradation of DDT in contaminated soil was achieved.
Bibliografie:	SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	0301-4797 1095-8630
DOI:	10.1016/j.jenvman.2015.07.025