The Study On The Water Quality Control Factors Of Coal Mining Subsidence Waters

Coal's production and consumer always account for extremely important status in our country. Because of coal mining for many years, many environmental problems have been caused, including coal mining subsidence.Until now, 120km2 subsidence area has cased by coal mining in the Huainan coal mine area. This area lengthwise Huaihe rive, and has many river networks. Underground water has relatively shallow burial depth, and coal mining has a long history. Subsidence area is large. At present, the catchments have reached 75km2. The maximum depth has got over 20m. Plenty of freshwater resource has been storied in the subsidence waters.The thesis takes Huainan coal mine area as a case, and selects three subsidence waters as research objects which in different subsidence age, respectively named Panyi coal mine, Xieqiao coal mine and Zhangbei coal mine. The thesis through monthly sample in the March 2007 to March 2008 of three researching objects then choose physico-chemical indexes and heavy mental as detection objects. According to environmental quality standards for surface water(GB3838-2002), the thesis obtains the heavy mental values are very low. Except Pb belongs toâ…¢grade of No.1 and No.3 subsidence water and Hg belongs toâ…£grade, other heavy mental indeies are belong toâ… grade. In the physico-chemical indexes, TP is belongs toâ…¡grade, except TP of Np.3 subsidence water;TN and CODcr belong toâ…¤grade in the all subsidece water;Other physico-chemical indeies are belong toâ… grade.Based on the monitoring data analysis , in order to obtain the control factors of subsidence water's water quality, the thesis does a fileld verified experiment which choose Panyi coal mine and Pansan coal mine's more large subsidence water. Then the thesis obtains three characters of coal mine subsidece water, including the subsidece water of Huainan coal mine has obviously stratified phnomenon; the subsidece water'quality on the working face is more better than other place; the main morphology of heavy mental is composit. In order to identify the effect of mine erthquake, the thesis does a laborotary simulation experiment. At the end, the thesis obtain the water quality control factors of subsidence waters main in three aspects, namely the control function of coal mining, Which the control function of coal mining includes mine earthquake effect, mine drainage and mine waste solid leaching effect, the control function of subsidence age, and the control function of non-point pollution source.