研究报告

  • 赵梦,骆乾坤,刘蒙,邓亚平,马雷,钱家忠.地下水中氯代烃污染原位生物修复精细模拟研究[J].环境科学学报,2022,42(6):178-187

  • 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
  • 基金项目:国家自然科学基金项目(No.41502226,41831289)
  • 作者
  • 单位
  • 赵梦
  • 合肥工业大学资源与环境工程学院,合肥 230009
  • 骆乾坤
  • 合肥工业大学资源与环境工程学院,合肥 230009
  • 刘蒙
  • 合肥工业大学资源与环境工程学院,合肥 230009
  • 邓亚平
  • 合肥工业大学资源与环境工程学院,合肥 230009
  • 马雷
  • 合肥工业大学资源与环境工程学院,合肥 230009
  • 钱家忠
  • 合肥工业大学资源与环境工程学院,合肥 230009
  • 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 m3·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.
  • Abstract: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 m3·d-1 for the study area. This study is expected to provide accurate simulation model for in-situ bioremediation of groundwater contaminated by VCHs.

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