Groundwater contamination by petroleum products has become a common problem. These chemicals could contaminate groundwater and cause significant health risk. Benzene, one species of the seproducts, gave rise to specific concern due to its relatively high water solubility and toxicity. Becausedissolved oxygen (DO) in groundwater is often lacking, biodegradation has indicated limited ability tocompletely restore benzene-contaminated aquifer. The slow-release oxygen source (SOS) technique canincrease DO concentrations in groundwater and accelerate biodegradation process. Thereby, a transport modelincluding benzene, DO and one microbial species was built and relevant modified program codes werecompiled on the basis of MODFLOW/MT3DMS. Then, a two-dimensional synthetic aquifer with a pointsource of benzene was simulated by the modified model to analyze SOS’s treatment efficiency. There were 5scenarios for different well location, different oxygen release rate and simultaneity 7 release oxygen wellsalong transverse direction. The results showed that the modified model can be used to simulate benzenetransport under SOS technique where Monod kinetic reactions occur. Placing the release oxygen well closer tosource was more efficient. For the same well location, higher oxygen release rate would enhancebioremediation effect. Enough DO maybe accelerate the growth of microbial species, and more benzene couldbe consumed by increasing microbial mass.
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