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Study on Transport and Numerical Simulation of MTBE in Underground Surroundings

Author: GaoChuanBo
Tutor: JiangBin
School: Tianjin University
Course: Chemical Engineering
Keywords: Organic Pollutants MTBE Soil and groundwater Solute transport
CLC: X53
Type: Master's thesis
Year: 2006
Downloads: 210
Quote: 0
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Abstract


Migration studies of organic matter in the soil environment is an important step in the investigation of soil organic pollution. The aim is that by studying the migration and transformation of organic contaminants in the subsurface environment, monitoring and prediction of pollutant migration speed and contaminated areas for follow-up environmental governance to provide a reference. As a new gasoline additive, methyl tert-butyl ether (MTBE) while reducing harmful emissions, but also the subsurface environment constitutes a hazard. Because MTBE relatively large solubility and not easily biodegradable, different from traditional petroleum-based organic pollutants, it is necessary in the soil environment migration and transformation of independent in-depth research, but relatively little research. Based on this background, the migration of MTBE in the soil subsurface environments. This paper analyzes the mass transfer equation model built MTBE migration in the soil environment. Description of the scope of application of the model as well as the required solution of the model parameters. By experimental methods to study the soil physical parameters of the model parameters. The coefficient of permeability of the soil, soil permeability tester obtained from the adsorption equilibrium experiments MTBE in the 20-40 mesh coarse sand and of 50-80 mesh fine sand and sand mixing in the sorption distribution coefficient, based on the adsorption kinetics experiment to obtain different adsorption kinetic parameters of the medium, and that the adsorption process is reversible. MTBE effective diffusion coefficient in the coarse sand, fine sand and sandy soil, the soil column diffusion experiments by analyzing the effective diffusion coefficient as the sand particle size decreases, nearly an order of magnitude difference, and explains the reliability of the application of the effective diffusion coefficient in different media. One-dimensional soil column experiments simulated MTBE in unsaturated soil area perpendicular to the direction of migration position obtained MTBE migration rate decreased gradually increased with the soil moisture content from top to bottom. After a certain time, the concentration of pollutants in the final soil column converge. Two-dimensional sand box to simulate the migration of MTBE in the soil saturation conditions, found that the migration of pollutants of groundwater velocity and soil particle size greater impact. Of HYDRUS-2D software to solve the model, different operating time Distribution of concentration, simulation results and experimental data results are in good agreement. Description of the accuracy of the model of the simulation of the quartz sand medium. The model is extended to the field simulation, simulation results and live coverage of the basic line. Description of the model on-site contaminant migration process monitoring and forecasting.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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