Optimal production of polyhydroxyalkanoates in activated sludge biomass |
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| Authors: | Ma C. K. Chua H. Yu P. H. F. Hong K. |
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| Affiliation: | (1) Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;(2) Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;(3) Engineering School, South China University of Tropical Agriculture, 571737 Danzhou, Hainnan, China |
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| 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%. |
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| Keywords: | Activated sludge polyhydroxyalkanoates carbon: nitrogen ratio intermittent nitrogen feeding wastewater treatment |
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