Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/19034
Title: Optimal production of polyhydroxyalkanoates (PHA) in activated sludge fed by volatile fatty acids (VFAs) generated from alkaline excess sludge fermentation
Authors: Cai, M
Chua, H
Zhao, Q
Sin, NS
Ren, J
Keywords: Activated sludge
Aerobic dynamic feeding
Carbon source
Excess sludge fermentation
Polyhydroxyalkanoates
Issue Date: 2009
Publisher: Elsevier
Source: Bioresource technology, 2009, v. 100, no. 3, p. 1399-1405 How to cite?
Journal: Bioresource technology 
Abstract: To reduce the production cost of polyhydroxyalkanoates (PHA) and disposal amount of excess sludge simultaneously, the feasibility of using fermentative volatile fatty acids (VFAs) as carbon sources to synthesize PHA by activated sludge was examined. At pH 11.0, 60 ?XC and fermentative time of 7 d, the VFAs yield was 258.65 mgTOC/gVSS. To restrain cell growth during PHA production, the released phosphorus and residual ammonium in the fermentative VFAs was recovered by the formation of struvite precipitation. Acetic acid was the predominant composition of the fermentative VFAs. PHA accumulation in excess sludge occurred feeding by fermentative VFAs with aerobic dynamic feeding process. The maximum PHA content accounted for 56.5% of the dry cell. It can be concluded from this study that the VFAs generated from excess sludge fermentation were a suitable carbon source for PHA production by activated sludge.
URI: http://hdl.handle.net/10397/19034
ISSN: 0960-8524
EISSN: 1873-2976
DOI: 10.1016/j.biortech.2008.09.014
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