亚硝态氮在补连塔矿地下水库的迁移转化规律研究  

Migration and transformation of nitrite nitrogen in underground reservoir of Bulianta Mine

作　　者：赵丽[1,2] 孔伟芳 张庆 许峰 张攀群 邢明飞 ZHAO Li;KONG Weifang;ZHANG Qing;XU Feng;ZHANG Panqun;XING Mingfei(Department of Resource&Environmental Engineering,Henan Polytechnic University,Jiaozuo 454000;Shaanxi Key Laboratory of Coal Mine Water Disaster Prevention Technology,Xi'an 710077,China)

机构地区：[1]河南理工大学资源环境学院,焦作454000 [2]陕西省煤矿水害防治技术重点实验室,西安710077

出　　处：《干旱区资源与环境》2024年第4期114-120,共7页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(52370135);陕西省煤矿水害防治技术重点实验室开放基金项目(2021SKMS04);2022年度河南省高等学校重点科研项目(22B610002);河南理工大学博士基金(B2022-38);杰出青年基金(J2022-2)联合资助。

摘　　要：水资源短缺的西部地区,多通过地下水库充填煤矸石技术对矿井水进行临时储存和净化,但关于亚硝态氮在地下水库中的迁移转化研究较少。以补连塔矿富含生产废水的矿井水中亚硝酸盐为研究对象,通过模拟补连塔矿地下水库的水文地质环境,开展柱动态淋滤实验,研究亚硝态氮在采空区充填矸石中的迁移转化规律。研究结果表明:淋出液中NO_(3)^(-)-N、NH_(4)^(+)-N、TIN和TDS浓度均经过急剧上升、缓慢下降、最后趋于稳定三个阶段,亚硝态氮的去除率在78.9%~89.8%,淋出液TDS值约是淋滤用液2倍。整个实验过程中,约15.65%的无机氮被充填矸石吸附或转化为N_(2)、N_(2)O或NO等氮化合物。煤矸石中的氨氮易在前期大量溶出,随着时间的推移溶出量逐渐减少并趋于稳定。氨氮对pH的缓冲作用、氮素的生物转化及煤矸石碱性组分的溶出使得淋出液pH值逐渐升高但始终低于淋滤用液。研究结果可丰富氮素循环理论,对于评价我国西部煤矿区地下水库对矿井水的预处理效果及水质净化机理具有重要意义。In the water-scarce western regions of China,the temporary storage and purification of mine water are commonly achieved through the utilization of underground reservoirs for coal gangue backfilling.However,research concerning the migration and transformation of nitrite nitrogen in underground reservoirs has been notably scarce.This study focuses on nitrate nitrogen in mine water containing industrial wastewater from the Bulianta mine,simulates the hydrogeological conditions of the Bulianta mine's underground reservoir,and conducts the dynamic column leaching experiments,which aim to further investigate the migration and transformation laws of nitrite nitrogen within the backfilled gangue in the goaf area.The research findings indicate that the concentrations of nitrate nitrogen(NO_(3)^(-)-N),ammonia nitrogen(NH_(4)^(+)-N),total inorganic nitrogen(TIN),and total dissolved solids(TDS)in the effluent exhibited similar overall trends,characterized by three distinct phases:a rapid increase,followed by a gradual decrease,ultimately stabilizing.The removal efficiency of nitrite nitrogen ranged from 78.9%to 89.8%,with the TDS value in the effluent being approximately twice that of the influent.Throughout the experiment,approximately 15.65%of the inorganic nitrogen was adsorbed or converted into nitrogen compounds such as N_(2),N_(2)O,or NO by the backfilled coal gangue.Ammonia nitrogen within the coal gangue exhibited initial substantial leaching,which progressively decreased over time,eventually stabilizing.The buffering effect of ammonia nitrogen on pH,nitrogen's biological transformation,and the leaching of alkaline components from coal gangue collectively contributed to a gradual increase in the effluent's pH level.However,it consistently remained below the influent pH level.The research findings can enrich the theory of nitrogen cycle,which hold significant importance in assessing the pre-treatment effectiveness of underground reservoirs in western China coal mining areas for mine water and understanding the water p

关 键 词：地下水库 煤矸石 亚硝态氮 迁移转化 无机氮 

分 类 号：P641[天文地球—地质矿产勘探]