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Environmental Engineering Research 2022;27(6): 210467 DOI: https://doi.org/10.4491/eer.2021.467
The synthesis of polyhydroxyalkanoates from low carbon wastewater under anaerobic-microaerobic process: effects of pH and nitrogen and phosphorus limitation
Kequan Zhang, Qian Fang  , Yihan Xie, Yujia Chen, Tong Wei, and Yanyu Xiao
Department of Municipal Engineering,College of Civil Engineering, Guangzhou University, Guangzhou 510006, China
Corresponding Author: Qian Fang ,Tel: +86-020-13660263976, Email: 263438517@qq.com
Received: September 24, 2021;  Accepted: November 17, 2021.
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ABSTRACT
Polyhydroxyalkanoate (PHA) is a new type of bio-polyester which is expected to replace traditional petroleum-based plastics. The experiment was carried out based on anaerobic-microaerobic process. Firstly, the PHA accumulation capacity of activated sludge under different pH conditions was discussed, and then the batch test of nitrogen and phosphorus limitation was carried out under the condition of optimal pH. Moreover, the content of PHA monomer under nutrient restriction was also studied. The experimental results showed that when pH was not controlled (7.5~8.5), C:N and C:P weight ratio was equal to 150, the maximum content of PHA accounted for 50.39% and 36.07% of the dry cell weight, respectively. Besides, it was found that increasing the C:N weight ratio was beneficial to increasing the proportion of polyhydroxyvalerate (PHV) monomer in PHA.
Keywords: Activated sludge | Low-carbon | Microaerobic | Monomer content | Polyhydroxyalkanoate (PHA)
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