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
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.
吴健, 平倩, 李咏梅. 鸟粪石结晶成粒技术回收污泥液中磷的中试研究[J]. 中国环境科学, 2017, 37(3): 941-947.
WU Jian, PING Qian, LI Yong-mei. A pilot-scale study on struvite pellet crystallization for phosphorus recovery from sludge liquor. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(3): 941-947.
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