Modeling for Volatilization and Bioremediation of Toluene-contaminated Soil by Bioventing  

作　　者：隋红 李鑫钢 

机构地区：[1]National Engineering Research Center for Distillation Technology, Tianjin University, Tianjin 300072, China [2]School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

出　　处：《Chinese Journal of Chemical Engineering》2011年第2期340-348,共9页中国化学工程学报（英文版）

基　　金：Supported by the National High Technology Research and Development Program("863"Program)of China(2009AA063102,2007AA061202)

摘　　要：A two-dimensional numerical model is developed to simulate the flow,transport and biodegradation of toluene during bioventing （BV） processes in the unsaturated zones.The simulation for a single well BV system is used to illustrate the effect of air injection rate on remediation efficiency.The air is injected into the vadose zone to create a positive pressure.Simulation results show that air injection rate is a primary parameter governing the dispersal,redistribution and surface loss of contaminant.At injection rates of 81.504 m3·d-1 （Run 1） and 407.52 m3·d-1 （Run 2）,the total removed mass of toluene is 169.14 kg and 170.59 kg respectively.Ratios of volatilization to bio-degradation in Run 1 and Run 2 are 0.57︰1 and 0.89︰1,respectively,indicating that lower air injection rate enhances the biodegradation efficiency greatly.Air injection rate should be optimized to meet oxygen demand and to minimize the operational cost.一个二维的数字模型被开发在 bioventing (BV ) 期间模仿甲苯的流动，运输和 biodegradation 在不饱和的地区的过程。为一个单个井 BV 系统的模拟被用来在补习效率上说明空气注射率的效果。空气被注入 vadose 地区创造一个积极压力。模拟结果证明那空气注射率是管理疏开，再分配和沾染物的表面损失的一个主要参数。以 81.504 m3 的注射率 ? 楳湧晩捩湡散琠? 桴 ? 湩猭瑩 ? 潣瑮浡湩瑡潩 ? 敲敭楤瑡潩 ? 灯牥瑡潩？

关 键 词：BIOVENTING BIODEGRADATION unsaturated zone TOLUENE remediation 

分 类 号：X53[环境科学与工程—环境工程] TQ241.12[化学工程—有机化工]