BioChem - DOS

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

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Yang, X.; Wan, C.; Lee, D.J.; Du, M.; Pan, X.; Wan, F.

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<SUP>o</SUP>C. The maximum VFA productivity reached 365mg VFAsg<SUP>-1</SUP> volatile suspended solids in a 45-d operation, with most produced VFAs being acetate and propionate, principally produced by protein degradation. The Bacteroidia, &epsi;-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.

2014

Elsevier Applied Science

0960-8524

168

pp.173-179

10.1016/j.biortech.2014.02.066

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART69840922

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