Anaerobic digestion of food waste for volatile fatty acids (VFAs) production with different types of inoculum: effect of pH.

Abstract:

:Food waste anaerobic fermentation was carried out under acidic conditions using inocula based on aerobic activated sludge (Inoculum AE) or anaerobic activated sludge (Inoculum AN) for volatile fatty acids (VFAs) production. The results showed that food waste hydrolysis increased obviously when Inoculum AN was used relative to Inoculum AE at any pH investigated. Hydrolysis at pH 4.0 and uncontrolled pH was higher than that at other pHs when either inoculum was used. Additionally, VFAs production at pH 6.0 was the highest, regardless of the inoculum used. The optimum VFA yields were 0.482g/gVSSremoval with Inoculum AE and 0.918g/gVSSremoval with Inoculum AN, which were observed after 4d and 20d of fermentation, respectively. VFAs composition analysis showed that butyrate acid was the prevalent acid at pH 6.0, followed by acetate acid and propionic acid.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Wang K,Yin J,Shen D,Li N

doi

10.1016/j.biortech.2014.03.088

subject

Has Abstract

pub_date

2014-06-01 00:00:00

pages

395-401

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(14)00393-9

journal_volume

161

pub_type

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