Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 304, Issue -, Pages 388-399Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2015.10.067
Keywords
Biofilm; Microbial diversity; EPS; Polyacrylamide; Biodegradation
Categories
Funding
- National Natural Science Foundation of China [41273084]
- 863 Program [2013AA064403]
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Biofilms increase dragging force for liquid transportation, cause power consumption, and result in equipment corrosion in polymer-flooding oilfields. To reveal the responsible microorganisms for biofilm formation and stability of high-molecular-weight polyacrylamide (PAM), a biofilm, developed on the sieve of a piston plunger pump in a water transport and injection pipeline with partial hydrolyzed polyacrylamide (HPAM) in Daqing Oilfield, was collected and analyzed by molecular microbiology, chemical and physical methods. Diverse bacterial groups (11 families) were detected in the biofilm, including Pseudomonadaceae, Rhodocyclaceae, Desulfobulbaceae, Alcaligenaceae, Comamonadaceae, Oxalobacteraceae, Bacteriovoracaceae, Campylobacteraceae, Flavobacteriaceae, CIostridiales Incertae Sedis XIII and Moraxellaceae. Three archaeal orders of methanogens including Methanomicrobiales, Methanosarcinales and Thermoplasmatales were also detected separately. HPAM was degraded into lower molecular weight polymers and organic fragments with its amide groups hydrolyzed into carboxylic groups by the microorganisms. The microenvironment of the biofilm contained diverse bacterial and archaeal communities, correlating with the extracellular polymeric substance (EPS) and I-IPAM biodegradation. The results are helpful to provide information for biofilm control in oil fields. (C) 2015 Published by Elsevier B.V.
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