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A pilot-scale study on struvite pellet crystallization for phosphorus recovery from sludge liquor |
WU Jian, PING Qian, LI Yong-mei |
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China |
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Abstract In order to investigate the application conditions and product quality of struvite (MAP) pellet crystallization technology in actual engineering, a pilot-scale MAP reactor was used to recover phosphorus from sludge liquor derived from a sewage treatment plant in Wuxi. The optimal conditions for the struvite pellet formation were confirmed as follows: pH = 9.0, N:P:Mg molar ratio =4:1:1.3, reaction time=4d. Under the above optimal conditions, the recovery efficiency of PO43--P reached 85%, the average size of the harvested struvite particles was 0.74mm, and the struvite purity reached 98.23%. The harvested struvite particles have rhombic structure and with high purity. Economic analysis indicates that the total pharmaceutical cost of struvite pellet crystallization for phosphorus recovery is 0.38yuan/t sludge liquor.
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Received: 10 July 2016
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