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Comparison of polyhydroxyalkanoates production by activated sludges from anaerobic and oxic zones of an enhanced biological phosphorus removal system: effect of sludge retention time |
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| Authors: | Chang Hsuan-Fang Chang Wei-Chin Chuang Shun-Hsing Fang Ya-Lan |
| Institution: | a Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, Touliu 640, Yunlin County, Taiwan b Department of Safety, Health and Environmental Engineering, National Yunlin University of Science and Technology, Touliu 640, Yunlin County, Taiwan c Department of Environmental Engineering and Management, Chaoyang University of Technology, Taichung County, Taiwan |
| Abstract: | This study compared the PHAs production behavior of sludges from the anaerobic and oxic phases of an enhanced biological phosphorus removal (EBPR) system. This was accomplished by using the kinetics and stoichiometric coefficients obtained from aerobic batch tests to evaluate the performance of these two sludges. Experimental results indicated that the metabolic behavior of the sludges for PHAs production depend significantly on the operating sludge retention time (SRT) of the EBPR system. The oxic sludge with 5 days of SRT exhibited better PHAs production performance than anaerobic sludge. Conversely, the anaerobic sludge with 15 days of SRT had superior PHAs production capability compared to oxic sludge. These comparisons suggest that whether anaerobic or oxic sludge should be employed for PHAs production depends mainly on the operating SRT of the EBPR system. |
| Keywords: | Polyhydroxyalkanoates Sludge Enhanced biological phosphorus removal Anaerobic zone Oxic zone |
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