Mechanisms for low concentrations phosphorus removal in secondary effluent were studied, and a process was developed using limestone filters (LF), submerged macrophyte oxidation ponds (SMOPs) and a subsurface vertical flow wetland (SVFW). Pilot scale experimental models were applied in series to investigate the advanced purification of total phosphorus (TP) in secondary effluent at the Chengjiang sewage treatment plant. With a total hydraulic residence time (HRT) of 82.52 h, the average effluent TP dropped to 0.17 mg L−1, meeting the standard for Class III surface waters. The major functions of the LF were adsorption and forced precipitation, with a particulate phosphorus (PP) removal of 82.93% and a total dissolved phosphorus (TDP) removal of 41.07%. Oxygen-releasing submerged macrophytes in the SMOPs resulted in maximum dissolved oxygen (DO) and pH values of 11.55 mg L−1 and 8.10, respectively. This regime provided suitable conditions for chemical precipitation of TDP, which was reduced by a further 39.29%. In the SVFW, TDP was further reduced, and the TP removal in the final effluent reached 85.08%.
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Research Article|
April 01 2012
Advanced phosphorus removal for secondary effluent using a natural treatment system Available to Purchase
F. Ke;
F. Ke
1State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, Jiangsu 210008, China
2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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W. C. Li;
1State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, Jiangsu 210008, China
E-mail: [email protected]
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H. Y. Li;
H. Y. Li
3China Institute of Water Resources and Hydropower Research, Beijing 100038, China
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F. Xiong;
F. Xiong
4Jianghan University, Life Sciences College, Wuhan 430056, China
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A. N. Zhao
A. N. Zhao
1State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, Jiangsu 210008, China
2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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Water Sci Technol (2012) 65 (8): 1412–1419.
Article history
Received:
July 20 2011
Accepted:
November 15 2011
Citation
F. Ke, W. C. Li, H. Y. Li, F. Xiong, A. N. Zhao; Advanced phosphorus removal for secondary effluent using a natural treatment system. Water Sci Technol 1 April 2012; 65 (8): 1412–1419. doi: https://doi.org/10.2166/wst.2012.003
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