保定电厂冲灰水下渗污染地下水的数学模型

MATHEMATICAL SIMULATION ON UNDERGROUND WATER POLLUTED BY ASH-WATER OF BAODING POWER PLANT ASH-FIELD

在对保定电厂储灰场冲灰水、地下水化学成分和环境水文地质条件分析的基础上,运用一维均质数学模型,对灰水下渗污染地 下水的状况进行了数值模拟预测。结果表明,灰水下渗已造成储灰场周围地下水污染,但短时间内不会对距储灰场5 000 m处的保定市 水源地水质造成影响。

The paper aims to presenting an investigation and analysis of the effect of the ash field in Baoding Power Plant on the shallow groundwater and edge groundwater of the surrounding areas. Taking ash field of the plant as the research target, the author has done a series of testing and analyses that contribute to the determination of contamination degree in the course of seepage of the ash water into the water-bearing strata. Different contaminants, particularly, the organic ones in the gray water seepage after a series of physical and the chemical processes and living beings' actions prove to have permeated into the water-bearing strata. Components, such as main contaminants COD, BOD, As, Cr6+ and F- , can be found all over 90% of the surrounding underground water, yet Cl-'s components can hardly be found. At the same time, the investigation with the environmental hydrological and geological effect of the ash field by taking Cl- and COD as the forecasting factors, shows that the ash water downward seepage into the beneath groundwater-bearing strata has become a rectangular pollution source. With the water-bearing strata as homosphere and the dimension water quality mathematical model, the author has made the numerical simulation of ash water polluting ground-water testing and forecasting. The testing result helps to indicate that in about 60 years in the future, the Cl- of 25 mg/L moves 3 500 m westwards and reach the upright fringe of positive seepage. But COD will be quite different with Cl- , with the minimal rate leakage stretching in the northwest direction and maximal rate leakage in the south. While COD leak into the natural backdrop of groundwater (0. 4 mg/L) in the east direction, it extends towards the Well of Yimuquan (Baoding's key drinking water source) in a distance of about 3 000 meters. So far it can be predicted that in a short period of near future, ash water will have no effect on the quality of shallow groundwater and edge groundwater in this direction, hence no effect on the quality of Yimuquan Well.