地下水中氯代烃污染原位生物修复精细模拟研究  

Simulation of in-situ bioremediation of chlorinated hydrocarbon contamination in groundwater

作　　者：赵梦 骆乾坤[1] 刘蒙 邓亚平 马雷[1] 钱家忠[1] ZHAO Meng;LUO Qiankun;LIU Meng;DENG Yaping;MA Lei;QIAN Jiazhong(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009)

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009

出　　处：《环境科学学报》2022年第6期178-187,共10页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.41502226,41831289)。

摘　　要：原位生物修复技术是修复地下水中挥发性氯代烃(VCHs)污染的重要手段之一.精细模拟修复过程是实现高效修复的关键.然而以往多数模拟VCHs修复过程的研究并未全面考虑VCHs自然衰减性质,势必会造成预测误差.因此,本研究针对当前VCHs原位生物修复模型的局限性,提出考虑VCHs自然衰减性质的原位生物修复Monod-Natural attenuation(M-Na)模型.该模型主要将自主开发的M-Na模型的源代码以用户自定义反应模块的形式嵌入到RT3D中.通过注入乳酸提供氢气进行原位生物修复含水层中四氯乙烯(PCE)污染,验证M-Na模型的精确性,并分析了修复过程参数变化(包括乳酸的注入浓度和速率)对修复效果的影响.算例分析结果表明,VCHs的自然衰减作用可以将修复产物乙烯(ETH)浓度提高10%左右,这在VCHs污染修复模拟过程中不可忽略;同时算例中乳酸的最佳注入浓度为30 mg·L^(-1),最佳注入速率为200 m^(3)·d^(-1).本研究成果有望为地下水VCHs污染原位生物修复精细模拟及高效修复提供模型参考.In-situ bioremediation technology is one of the most important methods for volatile chlorinated hydrocarbons(VCHs)remediation in groundwater.Accurate simulation of the remediation process is critical for high-efficiency remediation.Nevertheless,most of the previous studies did not consider the natural attenuation of VCHs,which would lead to the inaccuracy in prediction.Therefore,this paper has proposed a Monod-Natural attenuation(M-Na)model of in-situ bioremediation considering the natural attenuation of VCHs to overcome the limitation of current VCHs in-situ bioremediation model.The source code of the M-Na model was coupled in RT3D in the form of user-defined reaction module.In this paper,hydrogen was provided by injecting lactic acid for in-situ bioremediation of tetrachloroethylene(PCE)contamination in aquifer to verify the accuracy of M-Na model and analyze the influence of controlling parameters(including lactic acid injection concentration and rate)of the remediation process.The simulation results have shown that the concentration of ethylene(ETH)increased about 10%due to the natural attenuation of VCHs,which could not be neglected.Meanwhile,the lactic acid optimal concentration is 30 mg·L^(-1) and the optimal injection rate is 200 m^(3)·d^(-1) for the study area.This study is expected to provide accurate simulation model for in-situ bioremediation of groundwater contaminated by VCHs.

关 键 词：VCHs 原位生物修复 数值模拟 乳酸 

分 类 号：X524[环境科学与工程—环境工程]