Effect of struvite and organic acids on immobilization of copper and zinc in contaminated bio-retention filter media

作     者：Chathurani Moragaspitiya Jay Rajapakse Graeme J.Millar Chathurani Moragaspitiya;Jay Rajapakse;Graeme J.Millar

作者机构：Science and Engineering FacultyQueensland University of Technology(QUT)Queensland 4000Australia 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2020年第32卷第11期

页      面：35-44页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 

基　　金：River Sands Pty Ltd.,Australia for providing the bioretention filter material for this experiment and for their support funded through the financial support of“Australian Government Research Training Program(RTP)Stipend” supported by generous funding from the Science and Engineer-ing Faculty(QUT)。 

主　　题：Immobilization Struvite Organic acids Heavy metal Contaminated soil Bio-retention 

摘      要：Few studies have been carried out to connect nutrient recovery as struvite from wastewater and sustainable utilization of the recovered struvite for copper and zinc immobilization in contaminated soil.This study revealed the effect of struvite on Cu and Zn immobilization in contaminated bio-retention soil in the presence of commonly exuded plant organic acids.The research hypothesis was that the presence of both struvite and organic acids may influence the immobilization of Cu and Zn in soil.The outcome of this research confirmed that more than 99%of Cu and Zn was immobilized in bio-retention filter media by struvite application.Water-soluble Cu and Zn concentrations of struvite treated soil were less than 1.83 and 0.86 mg/kg respectively,and these concentrations were significantly lower compared to the total Cu and Zn content of 747.05 mg/kg in the contaminated soil.Application of struvite to Cu-and Zn-contaminated soil resulted in formation of compounds similar to zinc phosphate tetrahydrate(Zn3(PO4)2·4H2O)and amorphous Cu and Zn phases.Struvite was effective in heavy metal remediation in acidic soil regardless of the presence of Ca impurities in struvite and the presence of plant organic acids in soil.Overall,this study revealed that struvite recovered from wastewater treatment plants has potential for use as an amendment for heavy metal remediation in contaminated bio-retention soil.