Risk assessment and control countermeasures of groundwater pollution caused by PTA chemical plant sewage
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Abstract:
Engineering investigation and a series of experiments, including the static adsorption, biodegradation, and dynamic soil column leaching experiments, were conducted at a PTA chemical plant in Luoyang to determine the solute transport parameters in the vadose zone. The migration of COD Cr in the vadose zone of the sewage reservoir was simulated using Hydrus21D. The re 2 sults showed that (1) it takes 5. 4, 5, 4. 9, and 3. 8 years for COD Cr to migrate from the reservoir bottom to water table under the normal, abnormal, ordinary accident, and risk accident conditions respectively without any anti2seepage measures, and the groundwater pollution risk caused by the sewage reservoir is high; and (2) it takes 12 1 2, 10 1 5, 9 1 1, and 6 1 8 years for COD Cr to migrate from the reservoir bottom to water table under the normal, abnormal, ordinary accident, and risk accident conditions re 2 spectively if there is a 2 152m thick clay layer under the sewage reservoir.
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