The Water Quality Difference Analysis in Different Closed Conditions of the Panji Coal Mining Subsidence Waters in Huainan

Because of coal mining for many years, there are 36.06 km² subsidence areas in the Panji region of Huainan city, 11.32 km² of which are catchments. The paper selects two subsidence waters which are in different closed conditions as research objects. Based on water quality monitoring values, the paper gets that opened subsidence water quality is better than closed one by using the method of fuzzy comprehensive evaluation. This paper carries out the difference analysis and obtains that the water quality is affected by use patterns, residential places, mine drainage and coal gangue.