利用生物渗透性反应墙修复地下水Cr(VI)污染的数值模拟  

Numerical simulation of groundwater remediation of hexavalent chromium contaminated site by the bio-permeable reactive barrier

作　　者：刁文钦 宋健 王琳 吴剑锋 刘媛媛 吴吉春 DIAO Wen-qin;SONG Jian;WANG Lin;WU Jian-feng;LIU Yuan-yuan;WU Ji-chun(Key Laboratory of Surficial Geochemistry,Ministry of Education,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;Natural Resources Monitoring Institute of Henan Province,Zhengzhou 450016,China)

机构地区：[1]南京大学地球科学与工程学院,表生地球化学教育部重点实验室,江苏南京210023 [2]河南省自然资源监测院(河南省自然资源科技创新中心),河南郑州450016

出　　处：《中国环境科学》2022年第7期3234-3243,共10页China Environmental Science

基　　金：国家重点研发计划(2019YFC1805302);国家自然科学基金资助项目(41772254)。

摘　　要：为降低地下水中的Cr(VI)污染,选择生物反应过程中常见的电子供体(糖蜜)和连二亚硫酸盐分别作为渗透性反应墙(PRB)的反应材料和生物杀灭剂,以期能促进生化反应还原Cr(VI)的同时还能阻止生物堵塞效应.采用PFLOTRAN软件模拟以糖蜜为反应材料和连二亚硫酸盐为生物杀灭剂的PRB修复非均质含水层中重金属污染的生物化学反应过程.结果表明,该PRB技术能有效降低Cr(VI)浓度至0.1mg/L以下;提高生物杀灭剂的注入浓度,注入速率以及降低糖蜜初始浓度可避免生物堵塞效应,达到修复Cr(VI)污染与提高PRB使用寿命的双重目标.研究成果可为类似场地地下水重金属污染修复的最优设计方案提供决策依据.In order to reduce Cr(VI)in groundwater,the common electron donor(molasses)and dithionite in the biological reaction process were selected as the reactant and biocide of PRB,for the purpose of promoting the biochemical reaction to reduce Cr(VI)and preventing the bioclogging effect.PFLOTRAN software was adopted to simulate the biochemical reaction process of PRB with molasses as the reaction material and dithionite as the biocide to remove heavy metal pollutant in the heterogeneous aquifer.The results show that the PRB technique can reduce the Cr(VI)concentration to below 0.1mg/L;the bioclogging effect can be avoided by designing the concentration of biocide,injection rate and initial concentration of molasses,in order to achieve the dual goal of removing Cr(VI)and improving the longevity of PRB.The results of research can provide a decision-making basis for the optimal design plan of heavy metal contamination remediation in the groundwater for similar sites.

关 键 词：重金属污染 生物堵塞 渗透性反应墙 PFLOTRAN软件 

分 类 号：X523[环境科学与工程—环境工程]