地球科学进展

地球科学进展 ›› 2004, Vol. 19 ›› Issue (3): 403 -408. doi: 10.11867/j.issn.1001-8166.2004.03.0403

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Natural Attenuation of Fuel Hydrocarbon Contaminants:Correlation of Biodegradation with Hydraulic Conductivity in a Field Case Study
LUGuo-ping 1;ZHENGChun-miao 2   
  1. Lawrence Berkeley National Laboratory，Berkeley CA，USA；University of Alabama，TuscaloosaAL，USA
  • 收稿日期:2004-04-09 出版日期:2004-12-20
  • 通讯作者: Lu Guoping(1963-),Ph.D.main interest:geological science. E-mail:E-mail: guopinglu@yahoo.com

Natural Attenuation of Fuel Hydrocarbon Contaminants:Correlation of Biodegradation with Hydraulic Conductivity in a Field Case Study

LUGuo-ping 1;ZHENGChun-miao 2   

  1. Lawrence Berkeley National Laboratory，Berkeley CA，USA；University of Alabama，TuscaloosaAL，USA
  • Received:2004-04-09 Online:2004-12-20 Published:2004-06-01

Two biodegradation models are developed torepresent natural attenuation of fuel－hydrocarbon contaminants as observed in a comprehensive natural-gradient tracer test in a heterogeneous aquifer on the Columbus Air Force Basein Mississippi，USA．The first， a first-order mass loss model，describes the irreversible losses of BTEX and its individual components， i．e．，benzene（B），toluene（T），ethyl benzene（E），and xylene（X）．The second， a reactive pathway model，describe ssequential degradation pathways for BTEX utilizing multiple electron acceptors，including oxygen，nitrate，iron and sulfate，and via methanogenesis．The heterogeneous aquifer is represented by multiple hydraulic conductivity（ K） zones delineated on the basis of numerous flowmeter K measurements．A direct propagation artificial neural network（DPN）is used as an inverse modeling tool to estimate the biodegradation rate constants associated with each of the K zones．In both the mass loss model and the reactive pathway model，the biodegradation rate constants show an increasing trend with the hydraulic conductivity．The finding of correlation between biodegradation kinetics and hydraulic conductivity distributions is of general interest and relevance to characterization and modeling of natural attenuation of hydrocarbons in other petroleum-product contaminated sites．

关键词: Benzene;BTEX;Natural attenuation;Contaminant transport model;Aquifer heterogeneity, Kinetics

Two biodegradation models are developed torepresent natural attenuation of fuel－hydrocarbon contaminants as observed in a comprehensive natural-gradient tracer test in a heterogeneous aquifer on the Columbus Air Force Basein Mississippi，USA．The first， a first-order mass loss model，describes the irreversible losses of BTEX and its individual components， i．e．，benzene（B），toluene（T），ethyl benzene（E），and xylene（X）．The second， a reactive pathway model，describe ssequential degradation pathways for BTEX utilizing multiple electron acceptors，including oxygen，nitrate，iron and sulfate，and via methanogenesis．The heterogeneous aquifer is represented by multiple hydraulic conductivity（ K） zones delineated on the basis of numerous flowmeter K measurements．A direct propagation artificial neural network（DPN）is used as an inverse modeling tool to estimate the biodegradation rate constants associated with each of the K zones．In both the mass loss model and the reactive pathway model，the biodegradation rate constants show an increasing trend with the hydraulic conductivity．The finding of correlation between biodegradation kinetics and hydraulic conductivity distributions is of general interest and relevance to characterization and modeling of natural attenuation of hydrocarbons in other petroleum-product contaminated sites．

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