| Water resources are an important guarantee to realize the sustainable development of arid and semi-arid areas in Xinjiang.Hongshaquan No.1 opencast coal mine in Xiheishan mining area is located in Zhundong coalfield of Xinjiang Uygur Autonomous region.It is located in Gobi desert and belongs to arid area.The ecological environment is fragile,water resources are extremely scarce,coal resources are abundant,and the annual production of raw coal is 8 million tons.Since it was put into production in 2015,the water demand has increased year by year.In view of the regional current situation,the annual water consumption has exceeded the total water resources control index by 24%and the local available groundwater quantity is very small.Therefore,on the basis of considering the demand for water resources in all aspects of coal mining,based on the prediction of water demand in the mining area from 2020 to 2024,it is an urgent need to investigate,analyze and optimize the current situation of water resources in the mining area.On the basis of field investigation,experimental analysis and model calculation,the paper comprehensively analyzes the water link and drainage condition in the production process,improves the water treatment efficiency by optimizing the water treatment process design,establishes the mathematical model,optimizes the water resources allocation in the mining area,and realizes the efficient utilization of water resources in the mining area.The main findings are as follows:(1)Through the comprehensive analysis of the production process of opencast coal mine,combined with the field sample collection and analysis,the water quality of the whole production process is evaluated by single factor,principal component analysis and fuzzy comprehensive evaluation method.The evaluation results show that the water quality of mine water is grade V of groundwater quality standard(GB/T 14848-2017)and coal industry pollutant discharge standard(GB20426-2006),and the characteristic pollution factor is CODcr;the effluent quality of domestic sewage treatment station is grade III of pollutant discharge standard(GB18918-2002)of urban sewage treatment plant,The characteristic pollution factors are total phosphorus,ammonia nitrogen,and SO42-and chloride in tap water do not meet the hygienic standard of drinking water(GB5749-2006).(2)In view of the available water sources in the existing production links and according to the use,the flocculating and settling method is adopted for the mine water in the mining area,the domestic sewage integrated treatment facility is adopted for the domestic sewage,and the oily waste water is adopted for the oil removal+sedimentation+filtering sewage treatment facility,optimize the design of water treatment process to improve water quality,to achieve economic utilization of resources.(3)Through the forecasting,comparison and revision of water demand in the study area for 2011-2019,the GM(1,1)model using the grey forecasting method is determined,the water demand for 2020-2024 is predicted according to the actual water use situation,and the water demand for 2020-2024 is predicted to be 355.08,438.05,540.42,666.70,822.5 million t/a.(4)Based on the three objective functions of society,economy and environment,under the constraint that the guarantee rate of water supply in mining area is not less than 95%related to people's livelihood,the guarantee rate of industrial is not less than 85%,and the guarantee rate of environmental protection is not less than 80%,the optimal allocation model of multi-objective water resources is adopted,and genetic algorithm is used to optimize the solution based on Matlab interface.The results of allocation in 2020-2024 years are obtained.The results of allocation meet the constraint conditions of water demand in mining area under the condition of economic minimization,the allocation of water resources in the study area is feasible.Figure 30 table 56 reference 109... |
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