基于Visual Modflow的某化工项目地下水污染预测

摘要

Based on investing the hydrogeological conditions and groundwater observation in a chemical plant simulation area in Henan,using Visual Modflow software,sewage treatment plant as the simulation leakage point,CODMn is selected as the controlled pollution factor, the maximal rate of the leakage reaching 200L/m2d under abnormal condition,the groundwater pollution is simu-lated to evaluate the possible pollution level of groundwater in the simulation area. The simulation results show that if the standard values of I and III in water quality standard(CODMn)in ground-water quality standard(GB/T14848-1993)are respectively used as the influence range and range of underground pollution,under ab-normal conditions, the maximum concentration of CODMn was 12.478 mg/L in the past first years, and the maximum concentra-tion of CODMn was about 82.0544 mg/L in the thirtieth year.The thirtieth years influence range of CODMn has reached the plant boundary.In addition,the 27th day,CODMn concentration exceed-ed the groundwater I class standard,the maximum of its concentra-tion is 1.0288 mg/L.If the scope of the plant is taken as a pollution control range,the exclusion time in abnormal operating conditions is no more than 2 days.%在查明河南某化工厂模拟区水文地质条件及地下水观测的基础上,采用Visual Modflow软件,以厂区污水处理站为此次模拟泄露点,控制性污染因子选为CODMn,最大渗水量200L/m2d非正常工况下,产生的地下水污染进行模拟,以评价模拟区地下水可能的污染程度,模拟结果表明:若以《地下水质量标准》(GB/T14848-1993)中Ⅰ类和Ⅲ类水CODMn浓度标准值分别作为地下污染影响范围和超标范围,则非正常工况下,第1年CODMn浓度最大值为12.478mg/L,第30年CODMn浓度最大值为82.0544mg/L.第30年CODMn影响范围已到达厂区边界.此外,第27d,CODMn浓度超过地下水I类标准,其浓度最大值为1.0288mg/L,如果以厂区范围作为污染控制范围,则非正常工况排除的时间不超过2d.