环境工程学报2018，Vol.12Issue(2)：654-662,9.DOI:10.12030/j.cjee.201707141
白云石和硫酸哑铁复配对城市污泥中重金属形态分布及生物有效性的影响
Effect of dolomite-ferrous sulfate complex on speciation distribution and bioavailability of heavy metals in municipal sludge
摘要
Abstract
The treatment methods for the sludge from Hefei municipal wastewater treatment plant were studied,and the effects of three amendments dolomite,ferrous sulfate and dolomite-ferrous sulfate complex on the speciation distribution and bioavailability of heavy metals in the sludge were investigated,besides,a preliminary study on the mechanism of passivation were also investigated.The results showed that the addition of dolomite could raise the pH value of sludge,however,ferrous sulfate could reduce the sludge pH.When the dolomite-ferrous sulfate complex were added,the change of sludge pH was not significant.Dolomite has a better passivation effect on Cu and Cd in sludge,however,ferrous sulfate has a significant passivation effect on As in sludge.Dolomiteferrous sulfate complex had the significant passivation effect on heavy metals of Cu,Zn,Cd and As in the sludge.Dolomite-ferrous sulfate complex could significantly reduce the available state content of heavy metals in the sludge,5％ dolomite and 5％ ferrous sulfate complex treatment gave the best result.Compared with the control,the available contents of Cu,Zn and As decreased 59.58％,42.26％,40.93％ and 55.68％,respectively.SEM-EDS and Visual MINTEQ simulation results showed that the carbonate ions in the dolomite can react with the heavy metal to form a precipitate.The results of pot experiments showed that the accumulation of heavy metals in the upper part and the roots of Brassica chinensis L.was greatly reduced by dolomite and ferrous sulfate amendments to the sludge.The contents of Cu,Zn,Cd and As in the upper part had the maximum reduction rates of 53.56％,34.51％,57.29,77.04％,respectively.关键词
城市污泥/白云石/硫酸亚铁/重金属形态/生物有效性Key words
municipal sludge/dolomite/ferrous sulfate/heavy metal speciation/bioavailability分类
资源环境引用本文复制引用
陶祥运,李磊明,刘小红,司友斌..白云石和硫酸哑铁复配对城市污泥中重金属形态分布及生物有效性的影响[J].环境工程学报,2018,12(2):654-662,9.基金项目
公益性行业(农业)科研专项(201303101-06) （农业）
国家科技支撑计划项目(2015BAD05B04-02) （2015BAD05B04-02）
