NDLI: Bioelectricity-assisted partial degradation of linear polyacrylamide in a bioelectrochemical system

Content Provider	Springer Nature Link
Author	Cui, Yu Zhi Zhang, Jian Sun, Min Zhai, Lin Feng
Copyright Year	2014
Abstract	The wide application of water-soluble linear polyacrylamides (PAMs) can cause serious environmental pollution. Biological treatment of PAMs receives very limited efficiency due to their recalcitrance to the microbial degradation. Here, we show the bioelectrochemical system (BES) can be used as an effective strategy to improve the biodegradation efficiency of PAMs. A linear PAM with viscosity-average molecular weight of 5 × 106 was treated in the anodic chamber of BES reactor, and the change of PAM structure during the degradation process was investigated. The anodic bacteria in the BES demonstrated abilities to utilize the PAM as the sole carbon and nitrogen source to generate electricity. Both the anode-attached and planktonic bacteria contributed to the electricity generation, while the anode-attached community exhibited stronger electron transfer ability than the planktonic one. The closed-circuit and open-circuit operations of the BES reactor obtained chemical oxygen demand (COD) removal efficiencies of 32.5 and 7.4 %, respectively, implying the generation of bioelectricity could enhance the biodegradation of PAM. Structure analysis suggested the carbon chain of PAM was partially degraded in the BES, producing polymeric products with lower molecular weight. The microbial cleavage of the carbon chain was proposed to start from the “head-to-head” linkages and end with the formation of ether bonds.
Starting Page	947
Ending Page	956
Page Count	10
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	99
Issue Number	2
e-ISSN	14320614
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-09-06
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Polyacrylamide Bioelectrochemical system Partial degradation Carbon chain Microbiology Microbial Genetics and Genomics Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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