Study On Water Resources Utilization Of Goaf In Yunganggou Mining Area, Datong City, Shanxi Province

Since the last century,the coal industry has been an important pillar industry in Datong,north shanxi.On the one hand,the mining area has left a large number of goaf with a wide area in the long-term mining,which poses a serious threat to the safety development of coal resources affected by it.On the other hand,datong city and mining areas are short of water resources.The per capita water resources possession is only about 300m~3,which is only 1/10 of China's average level and far lower than the international standard of 9200m~3.The utilization of goaf water can not only ensure the safe mining of coal mines,but also solve the water shortage of coal mines and urban public water.This paper takes Yunganggou mining area as an example to study the amount and utilization of water resources in the goaf.The main results are as follows:(1)The formation mechanism of water in the goaf and the water accumulation process in the goaf are analyzed.Based on the results of geophysical exploration and drilling,the water volume in goaf of coal mine is evaluated by analytical method.The results show that the hydrostatic reserve of the goaf in the seven coal mines in the study area is 8.11million m~3.In addition,there are stable water outlet points in some goaf areas of jiangjiawan mine,qingciyao mine and yanzishan mine,with an average daily drainage volume of about 6000m~3.The goaf is rich in water resources.(2)According to the urban miscellaneous water GB/T 18920-2002,the single factor pollution index method was used to evaluate the pollution degree of the water samples in the goaf of the study area.The results show that the turbidity is the main pollution index in the goaf,and the average over-standard is about 5.5,and the highest value is 23.22 times.(3)Based on the water and water quality and water quality evaluation results of the goaf,combined with the actual topography and geomorphology conditions,a set of mobile water treatment process was designed with a daily processing capacity of5000m~3,and the main process principles and equipment parameters were given.(4)Through the practical application,the operation effect of the mobile water treatment process was evaluated.The results showed that the removal rate of suspended solids reached 95%,the removal rate of ammonia nitrogen was 89%,the removal rate of chemical oxygen demand was 77%,and the removal rate of total phosphorus was 82%.The water treatment results reached the standards for road water,flushing water and building construction water in the urban miscellaneous water standard.Through technical and economic comparisons,mobile water treatment equipment not only has good adaptability to poor terrain conditions,but also has low processing and operating costs.Figure 38 Table 15 Reference 77...