Research On Prevention Of Cross Strata Pollution And Influence On Water Characteristics By Drainage Which Comes From Coal Mine In Zichuan City

Coal resources is very rich at Zichuan.It is one of the major coal-producing district of Zibo City. After a long mining, especially large-scale exploitation of the previous century, Zichuan District coal mines into the aging period. Especially Hongshan and Zhaili coal discontinued or ceased, stopped pumping groundwater, the pit water level rised, the hydrodynamic field changed, had a profound impact on groundwater chemical field, caused deterioration of the local groundwater quality,had an adverse impact to living and industrial and agricultural production. Ceased mining pit water level rising edge of inclined gravity and exploitation of the mine dewatering and drainage, not only wasted groundwater resources but also.contaminated surface water, lack of water on water and quality coexisted in the study area.Through the mining area of surface water and groundwater pollution evaluation, the overall look of the regional surface water with high sulfate as the main feature, the sulfate is generally higher than250mg/L, showing a pit of water pollution water quality characteristics. Region karst water in general can be divided into micro-pollution, light pollution, pollution, heavy pollution and severe pollution of five levels of major pollutants in the groundwater of SO42-, total hardness, salinity dominated. Fissure water pollution relatively lava water is more common, especially banded distribution Xiaofu River front-line, by the distance followed by contamination from the river, heavy pollution and severe pollution. Quaternary pore water is directly affected by river water quality, Xiaofu River pollution levels are generally heavy pollution and severe pollution, the major pollutants are SO42-, total hardness, TDS, etc.Through the pit water quality characteristics and evolution of research, found that the formation of the chemical composition of mine drainage is from FeS2oxidized, and the results of follow-up series of reactions. Coal mine closure pit water quality feature:high sulfate, high hardness, high salinity.Through the groundwater quality assessment and pollution assessment, we can see that in the Hongshan closure mine karstic water quality distribution law is unlike in other mining areas. There is the problem cross strata pollution. By the pumping test, block test found that three basic methods to control cross strata pollution:cut the pollution channel; control groundwater flow field patterns, to prevent the spread of contamination; pre-control.