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作 者:袁瑞强[1] 章良玉 龙西亭 YUAN Ruiqiang;ZHANG Liangyu;LONG Xiting(School of Environment and Resource,Shanxi University,Taiyuan 030006,China;Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Institute of Deep Earth Sciences and Green Energy,Shenzhen University,Shenzhen 518060,China;Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;The 402 team,the Bureau of Geology and Mineral Resources Exploration of Hunan,Changsha 410014,China)
机构地区:[1]山西大学环境与资源学院,山西太原030006 [2]深圳大学广东省深地科学与地热能开发利用重点实验室,深地科学与绿色能源研究院,广东深圳518060 [3]深圳大学深圳市深部工程科学与绿色能源重点实验室,土木和交通学院,广东深圳518060 [4]湖南省地质矿产勘查开发局四零二队,湖南长沙410014
出 处:《水文》2021年第5期97-102,共6页Journal of China Hydrology
基 金:国家自然科学基金资助项目(42071037)。
摘 要:浅层地下水是洞庭湖上游平原农村居民分散供水的主要水源。地下水中的铁锰污染会威胁居民饮用水安全,带来健康风险。调查了该区域雨旱两季浅层地下水铁锰污染情况,分析了污染来源和形成规律,并讨论了适宜的除铁方法。结果表明,洞庭湖上游西洞庭湖平原浅层地下水中铁含量超过Ⅳ类和Ⅴ类水质标准,污染较普遍。浅层地下水的水化学成分主要来自硅酸岩风化,地层内的赤铁矿和针铁矿构成铁污染的物质来源。该区域含有机质的沉积物环境,偏弱酸性的地下水环境,以及盆地构造和平坦地形形成的地下水流动滞缓的动力环境有利于铁在浅层地下水中富集。雨季降水对平原区浅层地下水的更新交替和稀释作用通过降水入渗和上游山区来水在雨季后逐渐显示出来,使浅层地下水电导率平均降低21%,平均铁含量由1.8±4.5mg/L降低到0.2±0.3mg/L。对pH值小于7.5的地下水推荐使用多级滤柱填充法除铁;对pH值大于7.5的地下水使用氯氧化除铁。对于pH较低且含铁量较大的水源或者p H在7.5附近存在明显季节变化的水源可以通过升高其pH值再除铁。Shallow groundwater is the main water source for the scattered water supply of rural residents in the upper plain of the Dongting Lake.Iron and manganese pollution in groundwater seriously threatens the safety of residents’drinking water and poses health risks.This study investigated the pollution of iron and manganese in shallow groundwater during the rainy and dry seasons,analyzed the sources and formation of the pollution,and discussed suitable iron removal methods.The results show that in the upper plain of the Dongting Lake,especially in the West Dongting Lake Plain,the iron content in shallow groundwater generally reaches ClassⅣor even ClassⅤwater quality,which means iron pollution is common.The chemical composition of shallow groundwater mainly comes from the weathering of silicate rocks,and hematite and goethite constitute the material sources of iron pollution.The organic sediment environment,the weakly acidic groundwater environment,and the dynamic environment of the stagnant groundwater flow formed by the basin structure and flat terrain are conducive to the accumulation of iron in shallow groundwater.The renewal and dilution of shallow groundwater in the plain area by precipitation is gradually revealed after the rainy season through precipitation infiltration and lateral recharge from upstream mountains,reducing the conductivity of shallow groundwater by an average of 21% and decreasing the average iron content from 1.8±4.5 mg/L to 0.2±0.3 mg/L.It is recommended to use the multi-stage filter column packing method to remove iron for groundwater with a pH value less than 7.5.It is recommended to remove iron with chlorine oxide for groundwater with a pH value greater than 7.5.For the groundwater with low p H and high iron content or with seasonal pH values,iron can be removed after the pH increased by alkalifying.
分 类 号:TV211.1[水利工程—水文学及水资源]
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