复配还原剂对六价铬污染土壤的修复还原效果  

Remediation and Reduction Effect of Compound Reducing Agent on Hexavalent Chromium Contaminated Soil

作　　者：杜耀 朱于红 陶星名[2] 郑乾送 谭昊 王宇峰 陈华林[3] DU Yao;ZHU Yuhong;TAO Xingming;ZHENG Qiansong;TAN Hao;WANG Yufeng;CHEN Hualin(Zhejiang Zone-King Environmental Sci&Tech Co.,Ltd.,Hangzhou 310014,China;Hangzhou Wanxiang Polytechnic,Hangzhou 310023,China;College of Life and Environmental Sciences,Wenzhou University,Wenzhou 325035,China)

机构地区：[1]浙江卓锦环保科技股份有限公司,浙江杭州310014 [2]杭州万向职业技术学院,浙江杭州310023 [3]温州大学生命与环境科学学院,浙江温州325035

出　　处：《杭州师范大学学报（自然科学版）》2023年第2期173-179,共7页Journal of Hangzhou Normal University(Natural Science Edition)

基　　金：国家重点研发计划项目(2019YFC1803705);浙江省国际产业联合研发计划基金资助项目(2019C54002).

摘　　要：探讨多硫化钙(CPS)和糖蜜对土壤中六价铬Cr(Ⅵ)的还原效果.在处理时间60 d条件下,多硫化钙和糖蜜单一还原剂对土壤Cr(Ⅵ)的去除率分别为99.31%和93.35%;4∶1、1∶1及1∶4的多硫化钙和糖蜜复配还原剂对土壤Cr(Ⅵ)的去除率分别为99.35%、99.53%和95.14%,对浸出性Cr(Ⅵ)去除率均达到98%以上.多硫化钙和糖蜜协同修复对土壤环境pH影响较小,单一使用多硫化钙可提高土壤pH值,单一使用糖蜜可降低土壤pH值.各处理条件均可使土壤中的铬元素由可交换态向铁锰氧化物结合态和残渣态转化,同一处理时间内,1∶1的多硫化钙和糖蜜复配药剂更有利于土壤铬从可交换态向难利用残渣态转化,且经济效益较优.Reduction effect of calcium polysulfide(CPS)and molasses on hexavalent chromium Cr(Ⅵ)in the soil was discussed.The results showed that the removal rates of Cr(Ⅵ)in soil by CPS and molasses were 99.31%and 93.35%,within the condition of processing time 60 d.With the mass ratio of CPS and molasses of 4∶1,1∶1 and 1∶4,the removal rates of Cr(Ⅵ)in soil by these compound reducing agents were 99.35%,99.53%and 95.14%,and all the removal rates of leachable Cr(Ⅵ)were above 98%.Co-remediation of CPS and molasses had little impact on the pH of soil.The use of CPS alone could increase the pH of soil,while the use of molasses alone could reduce the pH of soil.All treatment conditions could make the chromium element in the soil transform from exchangeable state to iron-manganese oxide combined and residue states.During the same treatment period,the compound agent of CPS and molasses with a mass ratio of 1∶1 was more conducive to the transformation of soil chromium from exchangeable state to refractory residue state,and had better economic benefits.

关 键 词：六价铬污染 复配 修复 成本 土壤 

分 类 号：X53[环境科学与工程—环境工程]