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Bioresour Technol. 2014 Sep;168:173-9. doi: 10.1016/j.biortech.2014.02.066. Epub 2014 Feb 26.

Continuous volatile fatty acid production from waste activated sludge hydrolyzed at pH 12.

Author information

1
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
2
Department of Environmental Science and Engineering, Fudan University, Shanghai 20043, China.
3
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan. Electronic address: djleetw@yahoo.com.tw.
4
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
5
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China.

Abstract

This study adopted rapid alkaline treatment at pH 12 to hydrolyze 66% of total chemical oxygen demands. Then the hydrolyzed liquor was fermented in a continuous-flow stirred reactor to produce volatile fatty acids (VFAs) at 8-h hydraulic retention time and at 35 °C. The maximum VFA productivity reached 365 mg VFAs g(-1) volatile suspended solids in a 45-d operation, with most produced VFAs being acetate and propionate, principally produced by protein degradation. The Bacteroidia, ε-proteobacteria and the Clostridia were identified to be the classes correlating with the fermentation processes. The fermented liquor was applied to denitrifying phosphorus removal process as alternative carbon source after excess phosphorus and nitrogen being recycled via struvite precipitation. Fermented liquors from alkaline hydrolysis-acid fermentation on waste activated sludge are a potential renewable resource for applications that need organic carbons.

KEYWORDS:

Continuous; Denitrifying phosphorus removal; Fermentation; Volatile fatty acids; Waste activated sludge

PMID:
24630368
DOI:
10.1016/j.biortech.2014.02.066
[Indexed for MEDLINE]
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