宁东煤炭基地梅花井矿区地下水三氮特征及成因  

The evaluation and influencing factors of groundwater tri-nitrogen pollution in the Ningdong coal base,exemplified by Meihuajing field

作　　者：刘瑞平[1,2,3,4] 徐友宁 张江华[1,2,3,4] 陈华清 何芳[1,2,3,4] 乔冈 柯海玲[1,2,3,4] 史宇飞 LIU Ruiping;XU Youning;ZHANG Jianghua;CHEN Huaqing;HE Fang;QIAO Gang;KE Hailing;SHI Yufei(Xi’an Center of Geological Survey, CGS, Xi’an 710054, Shaanxi, China;Shaanxi Tongguan Field Scientific Surveys Base of Mine Geological Environment, MNR, Tongguan 714300, Shaanxi, China;Key Laboratory for Groundwater and Ecology in Arid and Semi-arid Area, CGS, Xi’an 710054, Shaanxi, China;Key Laboratory for Geo-hazards in Loess Area, MNR, Xi’an 710054, Shaanxi, China)

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]自然资源部矿山地质环境陕西潼关野外科学观测基地,陕西潼关714300 [3]中国地质调查局干旱半干旱区地下水与生态重点实验室,陕西西安710054 [4]自然资源部黄土地质灾害重点实验室,陕西西安710054

出　　处：《地质通报》2018年第12期2192-2198,共7页Geological Bulletin of China

基　　金：中国地质调查局项目<秦岭及宁东矿产资源集中开采区地质环境调查>(编号:DD20160336);<青海矿业开发地质环境效应调查>(编号:1212011220224);自然资源部行业科研专项<矿集区地球化学环境累积效应及预警研究>(编号:20111020);陕西省自然科学基础研究计划项目<金矿区水气界面发生交换作用下的河流汞迁移转化规律研究>(编号:2015JM4129);中央高校科研业务费基础研究计划项目(开放基金)<金矿区不同转化类型潜流带中挥发性Hg的运移关键参数测定与影响因素研究>(编号:310829161128)

摘　　要：为研究大规模综合机械化采煤氮污染来源及影响程度,选取宁东煤炭基地侏罗纪煤田鸳鸯湖矿区的梅花井井田为研究对象,通过调查取样分析,对梅花井井田地下水三氮污染分布、物源、水文地质条件进行研究。结果表明:(1)宁东煤炭基地鸳鸯湖矿区梅花井井田三氮NH4+、NO3-、NO2-含量范围分别为0.06～0.12mg/L、4.67～234mg/L、<0.01～2.01mg/L,与国家地下水质量标准Ⅲ类水质限值对比,NO2-达到重度或极严重污染,主要分布在潜水含水层;NO3-污染级别为中度、轻度污染,超标样点占调查样点的75%,垂向上已延伸到承压含水层。水平空间上无论矿权范围还是矿权外,污染样点均有存在。(2)部分水样中NO3-毫克当量百分数超过25%,对水化学类型产生影响。(3)煤矿区NO3-、NO2-的污染首先与丰富的物源有关,还受煤矿开采扰动、地形地貌条件、垂向补给径流、水文地球化学条件等因素的影响。研究结果为风积沙大型机械化煤矿开采区地下水氮污染的防治提供了可参考依据。In order to study the large-scale comprehensive mechanized coal mining nitrogen pollution sources and the influence degree,the authors selected the Jurassic coalfield of Yuanyang Lake mining area of Meihuajing well field as the research object.In order to study the three nitrogen pollutants and the effect of large-scale coal mining on groundwater,the authors conducted the sampling investigation of groundwater spatial distribution,physical source and hydrogeological conditions of Ningdong coal base.Some conclusions have been reached:(1)The ranges of three nitrogen pollutants NH^4+and NO^3-and NO^2-are0.06~0.12mg/L,4.67~234mg/L,and<0.01~2.01mg/L respectively in Meihuajing well field base in Yuanyang Lake mining coal area in the east of Ningxia;compared with the national underground water quality,NO2-reaches the level of severe or very severe pollution,and is mainly distributed in unconfined aquifer;the level of NO^3-pollution is moderate and mild,and the excessive standard sample points reach75%in all sample points,and they extend to the confined aquifer.In space,the pollution sample points are present,regardless of the range of mineral rights and out of mineral rights.(2)The NO^3-mg equivalent percentage of some water samples is more than25%,which affects the chemical type of water.(3)The pollution of NO^3-and NO2-in coal mine area is related first to abundant material source and second to the influence of coal mining disturbance and hydrogeochemical conditions.The results of the study provide a reference for the prevention and control of groundwater nitrogen pollution in the mining area of large mechanized coal mine.

关 键 词：宁东煤炭基地 地下水 氮 污染 影响因素 

分 类 号：P618.11[天文地球—矿床学] P64[天文地球—地质学]