Purification Effect Of Phreatic Aquifer On Coal Mine Drainage Pollutant Component In Kuye River Valley

In this paper, by choosing the pollutant components of coal mine drainage of Hengyuan coal mine in Northern Shaanxi as research object, and the research of the regularity of concentration change of the pollutant components after getting into phreatic aquifer in phreatic water migration route was carried out. By choosing the feasible experimental sites, sampling sections were arranged properly. We excavated 5 pits for phreatic water sampling, and collected samples from those 5 sites, as well as 35 bottles of water samples from 7 sites of coal mine drainage and Kuye river, which were all sent to the lab for test. Through analysis of the test result, the following conclusions were obtained: high content pollutant components in the drainage of Hengyuan coal mine were P, Cd, Pb, COD, electrical conductivity and petroleum, etc. 3 items that went down regularly in the phreatic water section of the coal mine drainage were: Cd, petroleum, electrical conductivity. Within the 5 meters approaching the sewage drain, Cd went down from 1.835 mu g/L to 0.808 mu g/L; petroleum went down from 1.20 mg/L to 0.82mg/L; electrical conductivity went down from 3.41ms to 1.895ms; which suggested that phreatic aquifer of this section had strong degradation and purification ability for the pollutant components brought by the coal mine drainage. The test result also showed that except for Cd, petroleum and electrical conductivity, the other pollutant components along the 47m's section all went from up to down and fluctuate, without notably regularity.