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| Purification effect of secondary effluent of municipal wastewater plant by shallow algal bed reactor based on Chlorella vulgaris |
| XIE Qingjie1, JIANG Shan1, GUAN Xiangwei2, CHANG Chengwei1, XIONG Xingang1, WANG Fan1 |
| 1. School of Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. China Kunlun Contracting and Engineering Corporation, Beijing 100037, China |
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Abstract Based on the shallow algal bed reactor, the purification effects of Chlorella vulgaris on carbon, nitrogen and phosphorus elements in secondary effluent from municipal sewage treatment plant were investigated under the conditions with different temperature, light intensity, light-dark ratio, CO2 volume fraction and hydraulic retention time in dynamic test. The depth treatment efficiency of Chlorella vulgaris reactor under long-term stable operation with water quality fluctuations was investigated. The results show that the optimal environmental conditions for depth treatment of sewage by Chlorella vulgaris are with temperature of 26 ℃, light intensity of 6 000 lx, light-dark ratio of 14 h∶10 h and CO2 volume fraction of 1%. Under the optimal operation conditions, when the reactor is operated continuously and stably with the hydraulic retention time of 1.0-1.5 d, the removal rates of chemical oxygen demand (COD), total phosphorus (TP) and ammonia nitrogen (NH3-N) in secondary effluent are 52.0%-86.8%, 75.6%-87.4%, 59.1%-75.9% and 64.0%-68.0%, respectively.
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Received: 18 April 2022
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2024, Vol. 45 
