Effects of phosphorus and nitrogen limitation on PHA production
in activated sludge |
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Authors: | Qinxue Wen Zhiqiang Chen Ting Tian and Wei Chen |
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Institution: | State Key Laboratory of Urban Water Resource and Environment,Harbin Institute of Technology,Harbin 150090,China |
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Abstract: | The e ects of phosphorus and nitrogen limitation on polyhydroxyalkanoate (PHA) production and accumulation by activated sludge
biomass with acetate as a carbon source were investigated. Pre-selected influent carbon-phosphorus (C:P, W/W) of 100, 160, 250, 500
and 750, and carbon-nitrogen (C:N, W/W) of 20, 60, 100, 125 and 180 were applied in the phosphorus limitation experiments and
the nitrogen limitation experiments, respectively. The maximum PHA accumulation up to 59% of the cell dry weight with a PHA
productivity of 1.61 mg PHA/mg COD consumed was observed at the C:N 125 in the nitrogen limitation experiment. This value was
much higher than that obtained in previous studies with a normal substrate feeding. The study showed that activated sludge biomass
would produce more polyhydroxybutyrate than polyhydroxyvalerate under the stress of nutrient limitation, especially under phosphorus
limitation conditions. The experimental result also indicated that both phosphorus and nitrogen limitation may cause sludge bulking. |
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Keywords: | polyhydroxyalkanoate acetate nitrogen limitation phosphorus limitation sludge bulking |
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