液氨储罐及污水调节池泄漏对地下水水质影响的风险预测

Risk Prediction of Influence on Groundwater Quality of Leakage Accidents of Power Plant

针对大唐安峪火电厂液氨储罐、污水调节池泄漏的液氨和废污水,采用地下水一维渗流二维水动力弥散溶质运移模型预测了地下水污染情况。结果表明,液氨进入含水层5年后,污染晕漂移6 800m,运移范围为0.866km2,水质污染超标范围为0.150km2;进入含水层6.34年后,液氨浓度可达Ⅲ类水质标准要求。废污水进入含水层5年后,地下水中COD污染超标范围为0.009km2,运移范围为0.014km2;进入含水层10年后,地下水中COD污染超标范围为0.016km2,运移范围为0.023km2。可见液氨储罐泄漏对地下水水质影响较大,污水调节池泄漏对地下水水质影响较小。

One-dimensional seepage two-dimensional dispersion of solute migration prediction model of the groundwa- ter is applied to predict the influence on groundwater quality of the iquid ammonia tank, sewage regulating reservoir leak- age accidents of Datang Ann power valley. The results show that the liquid ammonia penetrats into ground-water aquifer, pollution halo drifts 6 800 meter and water pollution exceeds range of 0. 150 square kilometers l in the fifth year, migration area is 0. 866 square kilometersl in the 6.34 years, the concentration of liquid ammonia can attain Grade III of groundwa- ter quality standard; in the fifth year, unclean wastewater penetrated into groundwater aquifer, COD of groundwater pol- lution exceeds range of 0. 009 square kilometers, migration area is 0. 014 square kilometers; in the tenth years, unclean wastewater penetrated into groundwater aquifer, COD of ground-water pollution exceeds range of 0. 016 square kilome ters, migration area is 0. 023 square kilometers. So, the liquid ammonia tank leakage has great impact on the groundwater quality while sewage regulating reservoir leakage has little impact on the groundwater quality.