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ISSN Print: 2381-1153 ISSN Online: 2381-1161

American Journal of Environmental Engineering and Science

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Influence of Cultivation Time on the Production of Polyhydroxyalkanoates by Activated Sludge

American Journal of Environmental Engineering and Science
Vol.1 , No. 1, Publication Date: Aug. 20, 2014, Page: 1-5

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Authors

[1]	Marzie Fatehi, Department of Chemical Engineering, Shahid Bahonar University, Kerman, Iran.
[2]	Seyed Ahmad Ataei, Department of Chemical Engineering, Shahid Bahonar University, Kerman, Iran.

Abstract

Polyhydroxyalkanoates (PHAs) are polyesters formed and accumulated by various bacterial species under unbalanced growth conditions. Due to the problems resulted from the disposals of plastic wastes and excess sludge of waste water treatment plants, the production of polyhydroxyalkanoates by treating activated sludge and determining the effect of cultivation time was the main issue of this paper. In this study, we tried to optimize the cultivation time to achieve the highest rate of PHA production by activated sludge. Experiment procedure was included adding carbon source (sodium acetate), aeration, sampling in defined times (every 6 hours), measuring of PHA and biochemical oxygen demand (BOD) of samples. Based on the results the amount of PHA increased with increasing cultivation time and the maximum amount of PHA is reached at 30 hours of cultivation which is equivalent to 0.6 g.L-1, after that the PHA content dropped. Moreover, the percentage of BOD removal was 68.93 % during this time.

Keywords

Polyhydroxyalkanoate, Polyesters, Activated Sludge, Cultivation Time, BOD Removal

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