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Environ Sci Technol

Title:		Polycyclic Aromatic Hydrocarbon Affects Acetic Acid Production during Anaerobic Fermentation of Waste Activated Sludge by Altering Activity and Viability of Acetogen
Author(s):		Luo J; Chen Y; Feng L;
Address:		"State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University , 1239 Siping Road, Shanghai 200092, China"
Journal Title:		Environ Sci Technol
Year:		2016
Volume:		20160614
Issue:		13
Page Number:		6921 - 6929
DOI:		10.1021/acs.est.6b00003
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Till now, almost all the studies on anaerobic fermentation of waste activated sludge (WAS) for bioproducts generation focused on the influences of operating conditions, pretreatment methods and sludge characteristics, and few considered those of widespread persistent organic pollutants (POPs) in sludge, for example, polycyclic aromatic hydrocarbons (PAHs). Herein, phenanthrene, which was a typical PAH and widespread in WAS, was selected as a model compound to investigate its effect on WAS anaerobic fermentation for short-chain fatty acids (SCFAs) accumulation. Experimental results showed that the concentration of SCFAs derived from WAS was increased in the presence of phenanthrene during anaerobic fermentation. The yield of acetic acid which was the predominant SCFA in the fermentation reactor with the concentration of 100 mg/kg dry sludge was 1.8 fold of that in the control. Mechanism exploration revealed that the present phenanthrene mainly affected the acidification process of anaerobic fermentation and caused the shift of the microbial community to benefit the accumulation of acetic acid. Further investigation showed that both the activities of key enzymes (phosphotransacetylase and acetate kinase) involved in acetic acid production and the quantities of their corresponding encoding genes were enhanced in the presence of phenanthrene. Viability tests by determining the adenosine 5'-triphosphate content and membrane potential confirmed that the acetogens were more viable in anaerobic fermentation systems with phenanthrene, which resulted in the increased production of acetic acid"
Keywords:		"Acetic Acid Fatty Acids, Volatile/biosynthesis *Fermentation Polycyclic Aromatic Hydrocarbons *Sewage;"
Notes:		"MedlineLuo, Jingyang Chen, Yinguang Feng, Leiyu eng Research Support, Non-U.S. Gov't 2016/06/09 Environ Sci Technol. 2016 Jul 5; 50(13):6921-9. doi: 10.1021/acs.est.6b00003. Epub 2016 Jun 14"