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

Abstract

Abstract: 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.

Key words: bioventing, biodegradation, unsaturated zone, toluene, remediation

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.

关键词: bioventing, biodegradation, unsaturated zone, toluene, remediation

SUI Hong, LI Xingang. Modeling for Volatilization and Bioremediation of Toluene-contaminated Soil by Bioventing[J]. , 2011, 19(2): 340-348.

隋红, 李鑫钢. Modeling for Volatilization and Bioremediation of Toluene-contaminated Soil by Bioventing[J]. , 2011, 19(2): 340-348.

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