RESEARCH PROGRESS ON VIVIANITE CRYSTALLIZATION-BASED PHOSPHORUS REMOVAL AND RECOVERY FROM WASTEWATER
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(Fe3(PO4)2·8H2O)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.
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