鸟粪石结晶成粒技术回收污泥液中磷的中试研究.PDF

中国环境科学 2017,37(3) ：941~947 China Environmental Science 鸟粪石结晶成粒技术回收污泥液中磷的中试研究 * 吴 健,平 倩,李咏梅 ( 同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上 200092) 摘要：为了探究鸟粪石(MAP)结晶成粒技术在实际工程中的应用条件及价值,利用鸟粪石中试反应器处理无锡某污水处理厂污泥脱水液, 确定了鸟粪石结晶成粒技术回收磷的最佳工况:pH=9.0,摩尔比 N:P:Mg=4:1:1.3, 反应周期为 4d.最佳条件下脱水液磷回收率达 85%,收获的 鸟粪石平均粒径为 0.74mm,纯度可达 98.23%.收获的 MAP 颗粒为规则斜方晶结构,品质较好,颗粒纯度高杂质少.经济分析表明,鸟粪石结晶 成粒技术回收每吨污泥液中磷的药剂成本为 0.38 元. 关键词：鸟粪石结晶成粒；中试；最佳工况；颗粒表征；经济分析 中图分类号：X703 文献标识码：A 文章编号：1000-6923(2017)03-0941-07 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). China Environmental Science, 2017,37(3)：941~947 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. Key words ：struvite pellet crystallization；pilot scale study ；optimal conditions ；characterization of particle ；economic analysis 磷既是环境水体富营养化的控制