Development of modeling software for predicting the multidimensional contaminant transport at a chlorinated-solvent contaminated site with a branching biodegradation reaction pathway(2/2)

Chlorinated ethenes are significant groundwater contaminants. Under anaerobic conditions, chloroethenes are subject to reductive dechlorination resulting in the stepwise conversion of PCE to TCE, DCE isomers (1,1-DCE, cis -1,2- DCE and trans -1,2- DCE), VC, and ethane. Multi-species transport analytical model is a cost-effective tool for simultaneous determination of the transport behavior of parent and daughter species of dissolved ethenes at chlorinated-solvent groundwater contaminated site. Although several multi-species transport analytical model have already been reported in the literature, those currently available have primarily been derived based on the coupled advection-dispersion equations with a straight chain biodegradation reaction pathway The multispecies transport analytical model with a straight chain biodegradation reaction pathway cannot account for the transport behaviors of individual DCE isomers. In this three-year industry-academy cooperation project, we collaborate with the Sinotech Environmental Techonology, Ltd. to develop a multi-species transport analytical model with a branching biodegradation reaction pathway for the purpose of accurately and simultaneously predicting the multi-dimensional contaminant transport behaviors of PCE, TCE, three DCE isomers, VC and ETH at chlorinated-solvent contaminated site. In the first year, a two-dimensional transport analytical model will be developed and the accuracy of its corresponding FORTRAN computer code will be assured elaborately. In the second year, we will extend the achievement of the first year to develop the three-dimensional transport analytical model and assure the performance of its FORTRAN computer code. A modeling software for predicting the multi-dimensional contaminant transport at a chlorinated-solvent contaminated site with a branching biodegradation reaction pathway will be systematically constructed by integrating the achievements of the first two years, collecting the field data of important transport parameters, providing some application examples and developing a friendly graphical user interface (GUI).