Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34437
Title: Optimal production of polyhydroxyalkanoates in activated sludge biomass
Authors: Ma, CK
Chua, H
Yu, PHF
Hong, K
Issue Date: 2000
Source: Applied biochemistry and biotechnology, 2000, v. 84-86, no. 1-9, p. 981-989
Abstract: Polyhydroxyalkanoates (PHAs) have been recognized as good candidates for biodegradable plastics, but their high price compared with conventional plastics has limited their use. In this study, actiated sludge microorgan isms from a conventional wastewater treatment process were induced, bycontrol-lingthe carbon: nitrogen (C:N) ratioin the reacorliquor, toaccumulate PHAs. In addition, an intermittent nitrogen feeding program was established to optimize the volumetric PHA productivity in a wastewater treatment process. The optimal overall polymer production yield of 0.111 g of polymer/g of carbonaceous substrate consumed was achieved under a C:N ratio of 96:1 by feeding nitrogen in the reactor liquor onceevery four cycles. At the same time, the amount of excess sludge generated from the wastewater treatment process was reduced by22.9%.
Keywords: Activated sludge
Polyhydroxyalkanoates
Carbon:nitrogen ratio
Intermittent nitrogen feeding
Wastewater treatment
Publisher: Humana Press
Journal: Applied biochemistry and biotechnology 
ISSN: 0273-2289
EISSN: 1559-0291
DOI: 10.1385/ABAB:84-86:1-9:981
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