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首页> 外文期刊>Journal of Environmental Engineering >Feasibility study of thermal in situ bioremediation
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Feasibility study of thermal in situ bioremediation

机译：热原位生物修复的可行性研究

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A feasibility study of a new technology for remediating sites contaminated with dense non-aqueous-phase liquids (DNAPLs) is presented. The technology combines two conventional remediation approaches, thermal treatment and in situ bioremediation, in an effort to improve bioavailability through increased dissolution and biodegradation rates at elevated temperatures. To evaluate this new approach, a simulation model has been developed that combines expressions for first-order dissolution of immobile DNAPL spheres, dual-Monod biodegradation kinetics, and diffusion-limited desorption from soil micropores. The model is used to simulate remediation of a possible future contained release at a test cell at the Groundwater Remediation Field Laboratory at Dover Air Force Base in Dover, Del. Model simulations were conducted for temperatures ranging from 15 to 40 degrees C using parameter values obtained from the literature. Simulation results show that, by increasing the temperature from 15 to 35 degrees C, the amount of mass removed in the effluent (i.e., the amount of mass not degraded in situ) is predicted to be reduced by 94%, and the time required to reach the cleanup objective is predicted to be reduced by 70%. Parameter value sensitivity was also examined. Only those parameters that substantially reduced the biodegradation rates were found to have a strong influence on the predicted benefits associated with elevated temperatures. Based on the results of these modeling experiments, coupling of these two remediation techniques appears to hold considerable promise for sites contaminated with DNAPLs. [References: 54]
机译：提出了一种新技术的可行性研究，该技术用于修复被浓非水相液体（DNAPLs）污染的场所。该技术结合了两种传统的修复方法，即热处理和原位生物修复，以通过在高温下增加溶解度和生物降解率来提高生物利用度。为了评估这种新方法，已经开发了一个模拟模型，该模型结合了固定DNAPL球的一级溶解，双重Monod生物降解动力学和从土壤微孔中扩散受限的解吸的表达式。该模型用于模拟在特拉华州多佛市多佛空军基地地下水修复野外实验室的一个测试单元对未来可能释放的污染物的修复。使用获得的参数值对温度范围从15到40摄氏度进行了模型仿真。从文学上。仿真结果表明，通过将温度从15摄氏度提高到35摄氏度，废水中去除的质量量（即未原位降解的质量量）预计将减少94％，并且所需的时间达到清理目标预计将减少70％。还检查了参数值灵敏度。发现只有那些大大降低了生物降解速率的参数才对与升高的温度相关的预计收益具有重大影响。根据这些模拟实验的结果，这两种修复技术的结合对于被DNAPL污染的位点似乎具有很大的希望。 [参考：54]

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