摘要
为了掌握煤矿地下水库储水过程中的水质演变机制,基于万利一矿地下水库工程实践,通过室内水岩相互作用实验,开展了采空区垮落煤岩对储水水质净/劣化机理与规律研究,据此提出了优化地下水库选址与调水复用的合理对策。结果表明:地下水库储水过程中,水体与采空区垮裂煤岩会发生长期水岩相互作用,得益于吸附、溶滤、离子交换、以及氧化还原等物理、化学过程,大部分水质指标得到明显改善;相比泥质或砂质类岩石,煤对水体的净化效果最好;实验80 d,煤对水体浊度、BOD5、余氯、石油类等指标的削减率可达85%以上,对总碱度、总硬度的降低率超过30%。然而,受水岩相互作用持续时间的影响,COD等关键指标值会出现先降后升的现象,表现出水库储水时间过长而导致的水质劣化效应。实验表明:万利一矿井下污水与煤、砂岩作用后,COD在实验4~5周时达标、而后又出现超标;而与铝质泥岩作用后,COD在实验4~23周内达标、而后超标。充分考虑井下分质用水需求以及岩石岩性对水质的影响规律,对万利一矿分别进行了“消防用水”和“采掘生产用水”地下水库的构建选址与储水时间优化确定。
In order to know the evolution mechanism of water quality in the process of water storage in underground reservoir, based on the engineering practice of underground reservoir in Wanli No.1 coal mine, the mechanism and regulation of water purification or deterioration caused by caving coal and rock in goaf are carried out by conducting water-rock interaction experiments, and the reasonable countermeasures are put forward for optimizing the location of underground reservoir and water reuse. The results show that in the process of underground reservoir water storage, there is long-term water-rock interaction, and most of the water quality indicators have been significantly improved due to physical and chemical processes such as adsorption, leaching, ion exchange and oxidation-reduction;coal has the better purification effect on water body than muddy or sandy rock does;after 80 days of experiment, the reduction rate of turbidity, BOD5, residual chlorine, petroleum and other indicators can reach more than 85%, and alkalinity and hardness can be reduced more than 30%. However, affected by the duration of water-rock interaction, COD and other key indicators will first drop and then rise, which shows the deterioration effect of water quality caused by long reservoir storage time. The results show that the COD of the sewage in Wanli No.1 coal mine reaches the standard in 4 to 5 weeks after it interacts with coal and sandstone and then exceeds the standard;while the water interacts with aluminum mudstone, COD reaches the standard in 4 to 23 weeks and then exceeds the standard. Considered the underground water demand for different quality and the influence of rock lithology on water quality, the construction site selection and water storage time of “fire water supply” and “mining production water supply” underground reservoirs in Wanli No.1 coal mine are optimized.
作者
智国军
鞠金峰
刘润
杨瑞刚
方志远
张成璞
ZHI Guojun;JU Jinfeng;LIU Run;YANG Ruigang;FANG Zhiyuan;ZHANG Chengpu(Wanli No.1 Coal Mine,Baotou Energy Co Ltd,Ordos,Inner Mongolia 0170,China;The National and Local Joint Engineering Laboratory of Internet Application Technology on Mine,China University of Mining and Technology,Xuzhou,Jiangsu 221008,China;IoT/Perception Mine Research Center,China University of Mining and Technology,Xuzhou,Jiangsu 221008,China;School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu221116,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2022年第4期779-785,共7页
Journal of Mining & Safety Engineering
基金
国家重点研发计划项目(2016YFC0501104)
煤炭开采水资源保护与利用国家重点实验室开放基金项目(SHJT-16-30.2)。
关键词
水岩相互作用
煤矿地下水库
水质净化
水质劣化
储水复用
water-rock interaction
underground reservoir in coal mine
water purification
water deterioration
water reuse
