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Flow, Transport and Biodegradation of Toluene During bioventing

Chinese Journal of Chemical Engineering 2004年第3期12卷 439-443页

作者：隋红徐世民李鑫钢姜斌黄国强 National Engineering Research Center for Distillation Technology Tianjin 300072 China School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China National Engineering Research Center for Distillation Technology Tianjin 300072 China National Engineering Research Center for Distillation Technology Tianjin 300072 China School of Chemical Engineering and Technology Tianjin University Tianjin 300072 Chinaioventing is conducted on one-dimensional soil columns. A numerical model is developed for simulating the mass exchange advective and dispersive transport and biodegradation of toluene. The model parameters are estimated independently through laboratory batch experiments or from literature. Simulations are found to provide reasonable agreement with experimental data. Experimental results show that toluene removal due to biodegradation is more important at the later stage. The total cleanup time when NAPL (non-aqueous phase liquid) phase exists was twice more than that without NAPL. Sensitivity analysis of parameters suggests that model predictions are mainly dependent on mass transfer coefficient and microbial parameters such as the half-saturation coefficient and maximum specific substrate utilization rate.

bioventing is conducted on one-dimensional soil columns. A numerical model is developed for simulating the mass exchange, advective and dispersive transport and biodegradation of toluene. The model parameters are estimated independently through laboratory batch experiments, or from literature. Simulations are found to provide reasonable agreement with experimental data. Experimental results show that toluene removal due to biodegradation is more important at the later stage. The total cleanup time when NAPL (non-aqueous phase liquid) phase exists was twice more than that without NAPL. Sensitivity analysis of parameters suggests that model predictions are mainly dependent on mass transfer coefficient and microbial parameters, such as the half-saturation coefficient and maximum specific substrate utilization rate.

关键词： bioventing transport biodegradation soil remediation non-aqueous phase liquid

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

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Chinese Journal of Chemical Engineering 2011年第2期19卷 340-348页

作者：隋红李鑫钢 National Engineering Research Center for Distillation Technology Tianjin University Tianjin 300072 China School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

A two-dimensional numerical model is developed to simulate the flow,transport and biodegradation of toluene during bioventing （BV） processes in the unsaturated *** simulation for a single well BV system is used to illustrate the effect of air injection rate on remediation *** air is injected into the vadose zone to create a positive *** results show that air injection rate is a primary parameter governing the dispersal,redistribution and surface loss of *** 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 *** 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 *** injection rate should be optimized to meet oxygen demand and to minimize the operational cost.

关键词： bioventing biodegradation unsaturated zone toluene remediation

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