蓝铁石结晶废水磷去除与回收技术研究进展

RESEARCH PROGRESS ON VIVIANITE CRYSTALLIZATION-BASED PHOSPHORUS REMOVAL AND RECOVERY FROM WASTEWATER

随着全球人口增长和工业发展,社会生产和生活对磷的需求不断增加。从含磷废水中回收磷可同时解决水体磷污染与磷资源短缺的问题。近年来,蓝铁石[Fe_(3)(PO_(4))_(2)·8H_(2)O]结晶磷回收技术,因其适用pH范围广、亚铁药剂廉价易得、应用前景广阔等优点而被大量研究。目前,蓝铁石结晶处理含磷废水技术仍处于起步阶段,有待解决的问题主要包括结晶的优化条件未完全确定,结晶过程机制尚不清晰,废水中抑制因子影响的解除方法未建立,结晶产物较小不易分离与再利用等。总结了国内外蓝铁石结晶技术在含磷废水处理方面的研究成果,并从蓝铁石性质与应用、蓝铁石结晶原理与反应器和蓝铁石结晶影响因素3方面进行阐述,为推进蓝铁石结晶磷回收技术在含磷废水处理中的研究和工程化应用提供参考。

With global population growth and industry development,the demand for phosphorus increases continuously.Recovering phosphorus from wastewater would be an appropriate solution for both phosphorus pollution in the receiving waters and the depletion of phosphorus resources.In recent years,the technology of phosphorus recovery via vivianite(Fe_(3)(PO_(4))_(2)·8H_(2)O)crystallization has attracted increasing attention for possible application in phosphorus-rich wastewater treatment with the advantages including a wide working pH range,cost-effectiveness of using ferrous salts,a high application potential,etc.Currently,this technology is still under development and challenges including the optimal reaction condition that need to determine;the mechanism of vivianite crystallization is still unclear;the influence of inhibitory factors in wastewater needs to be manipulated,and the small sizes of crystallization products are difficult to separate and reuse.This paper reviews the worldwide research progress on vivianite crystallization as a technology for phosphorus-rich wastewater treatment.The topics are the properties and utilization of vivianite,crystallization principles,and reactors,and influencing factors of vivianite crystallization,which provides reference for the further research and application of vivianite crystallization-based phosphorus removal and recovery processes in wastewater treatment.