Optimal allocation of goaf water quality utilization in old goaf based on differential evolution algorithm

ZHENG Lijun; YUE Junchao; WEI Yahui; GUO Shuitao; LUO Wenjun; WANG Xinyi

doi:10.16186/j.cnki.1673-9787.2021110001

Abstract：Most mine water has low pollution levels and can be used for drinking,industry,agriculture,ecol-ogy,and other purposes with slight treatment.The water supply in the old goaf of Wucun Mine in Jiaozuo Coalfield is 718 m3/h,and the water demand for drinking,power plants,irrigation,aquaculture,ecology and other users around the mining area is 1 073.74 m3/h.The water in the old goaf can only meet 66.87%of the water demand;The water in the old goaf needs to be treated to meet the standards before it can be supplied to users.There are significant differences in water treatment processes and costs among different users.Opti-mizing the allocation of water in the old goaf based on water quality is of great significance.Objectives In order to maximize the benefits of comprehensive utilization of mine drainage,Methods the water in the old goaf of Wucun Mine in Jiaozuo Coalfield was taken as the research object.Based on the calculation of avail-able goaf water supply and water quality analysis combined with the requirements of drinking water,power plants,irrigation,aquaculture,ecological water demand and water quality around the mining area,a math-ematical model for optimal allocation of 718 m3/h goaf water quality utilization was established,and the dif-ferential evolution algorithm was used to solve the model.Results The results showed that during irrigation period,drinking water reached 6.00 m3/h,power plant consumed 334.95 m3/h,irrigation consumed 353.89 m3/h,aquaculture consumed 19.76 m3/h and ecology consumed 3.40 m3/h;during non irrigation period,drinking water reached 6.00 m3/h,power plant consumed 688.84 m3/h,irrigation consumed 0 m3/h,aquacul-ture consumed 19.76 m3/h and ecological water reached 3.40 m3/h,the annual return on water quality utili-zation in the old goaf was the highest.Conclusions The research results will provide a reference for the re-source utilization of water in similar mine goaf areas and mine drainage.