Anaerobic biodegradation of partially hydrolyzed polyacrylamide in long-term methanogenic enrichment cultures from production water of oil reservoirs

The increasing usage of partially hydrolyzed polyacrylamide (HPAM) in oilfields as a flooding agent to enhance oil recovery at so large quantities is an ecological hazard to the subsurface ecosystem due to persistence and inertness. Biodegradation of HPAM is a potentially promising strategy for deal...

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Veröffentlicht in:Biodegradation (Dordrecht) 2018-06, Vol.29 (3), p.233-243
Hauptverfasser: Hu, Hao, Liu, Jin-Feng, Li, Cai-Yun, Yang, Shi-Zhong, Gu, Ji-Dong, Mu, Bo-Zhong
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container_title Biodegradation (Dordrecht)
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creator Hu, Hao
Liu, Jin-Feng
Li, Cai-Yun
Yang, Shi-Zhong
Gu, Ji-Dong
Mu, Bo-Zhong
description The increasing usage of partially hydrolyzed polyacrylamide (HPAM) in oilfields as a flooding agent to enhance oil recovery at so large quantities is an ecological hazard to the subsurface ecosystem due to persistence and inertness. Biodegradation of HPAM is a potentially promising strategy for dealing with this problem among many other methods available. To understand the responsible microorganisms and mechanism of HPAM biodegradation under anaerobic conditions, an enrichment culture from production waters of oil reservoirs were established with HPAM as the sole source of carbon and nitrogen incubated for over 328 days, and analyzed using both molecular microbiology and chemical characterization methods. Gel permeation chromatography, High-pressure liquid chromatography and Fourier-transformed infrared spectroscopy results indicated that, after 328 days of anaerobic incubation, some of the amide groups on HPAM were removed and released as ammonia/ammonium and carboxylic groups, while the carbon backbone of HPAM was converted to smaller polymeric fragments, including oligomers and various fatty acids. Based on these results, the biochemical process of anaerobic biodegradation of HPAM was proposed. The phylogenetic analysis of 16S rRNA gene sequences retrieved from the enrichments showed that Proteobacteria and Planctomycetes were the dominant bacteria in the culture with HPAM as the source of carbon and nitrogen, respectively. For archaea, Methanofollis was more abundant in the anaerobic enrichment. These results are helpful for understanding the process of HPAM biodegradation and provide significant insights to the fate of HPAM in subsurface environment and for possible bioremediation.
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ispartof Biodegradation (Dordrecht), 2018-06, Vol.29 (3), p.233-243
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subjects Ammonia
Ammonium
Ammonium compounds
Anaerobic biodegradation
Anaerobic conditions
Anaerobic microorganisms
Anaerobic processes
Analysis
Analytical methods
Anoxic conditions
Aquatic Pollution
Archaea
Bacteria
Biodegradation
Biomedical and Life Sciences
Bioremediation
Carbon
Chromatography
Cultures
Enrichment
Fatty acids
Flooding
Fourier analysis
Gels
Gene sequencing
Geochemistry
High performance liquid chromatography
Incubation period
Infrared spectroscopy
Life Sciences
Liquid chromatography
Microbiology
Microorganisms
Nitrogen
Oil and gas fields
Oil recovery
Oil reservoirs
Oligomers
Original Paper
Phylogeny
Polyacrylamide
Reservoirs
rRNA 16S
Soil Science & Conservation
Terrestrial Pollution
Waste Management/Waste Technology
Waste Water Technology
Water Management
Water Pollution Control
title Anaerobic biodegradation of partially hydrolyzed polyacrylamide in long-term methanogenic enrichment cultures from production water of oil reservoirs
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