期刊
JOURNAL OF BIOTECHNOLOGY
卷 168, 期 2, 页码 234-239出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jbiotec.2013.05.015
关键词
Waste activated sludge (WAS); Corn stover (CS); Volatile fatty acids (VFAs); Feedstock proportion; Co-digestion
资金
- National Science Foundation for Distinguished Young Scholars [51225802]
- National Natural Science Foundation of China (NSFC) [51111140388, 51208496]
- Science Fund for Creative Research Groups of the National Natural Science Foundation of China [51121062]
- National High-tech R&D Program of China (863 Program) [2009AA062906]
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2010BAC67B02]
- China Postdoctoral Science Foundation [2012M510574]
- Hundred Talents Program of the Chinese Academy of Sciences
- Heilongjiang Science Foundation for Distinguished Young Scholars [JC201003]
Volatile fatty acids (VFAs) are the most suitable and biodegradable carbon substrates for many bioprocesses. This study explored a new approach to improve the VFAs production from anaerobic co-digesting waste activated sludge (WAS) with corn straw (CS). The effect of feedstock proportion on the acidification efficiency was investigated. The maximum VFAs yield (corresponding fermentation time) was substantially increased 69% (96 h), 45% (72 h), 13% (120 h) and 12% (120 h) with 50%, 35%, 25% and 20% CS proportion of feedstock, respectively. HAc (acetic acid) was consistently the most abundant, followed by HPr (propionic acid) and n-HBu (butyric acid) in the co-digesting tests. The increase of CS in feedstock led to more production of HAc and HPr. Moreover, the consumption of protein and carbohydrate were also improved remarkably from 2955 and 249 mg COD/L (individual WAS fermentation) to 6575 and 815 mg COD/L (50%(WAS): 50%(CS) co-digestion) from 120 onward, respectively. The highest contribution of CS to additional VFAs production was1113 mg VFAs (as COD)/g CS/L in the 65%(WAS): 35%(CS) co-digesting test. Our study indicated a valuable method to improve VFAs production from anaerobic co-digesting WAS and CS. Crown Copyright (C) 2013 Published by Elsevier B. V. All rights reserved.
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