煤矿废水对煤矸石及周围农田土壤中Cu形态变化的影响  

Effect of Acidic Waste Water from Coal Mine on Cu Form Change in Coal Gangue and Surrounding Farmland Soils

作　　者：杨江江[1,2] 龙健[1,2] 李娟[2] 吴迪[1] 刘方[3] 廖洪凯[1] 韩爽[1] 

机构地区：[1]贵州师范大学贵州省山地环境信息系统与生态环境保护重点试验室,贵州贵阳550001 [2]贵州师范大学地理与环境科学学院,贵州贵阳550001 [3]贵州大学资源与环境学院,贵州贵阳550003

出　　处：《贵州农业科学》2011年第9期88-91,95,共5页Guizhou Agricultural Sciences

基　　金：国家973前期项目"喀斯特矿山环境演变与生态安全评价及预警方法的基础研究"(2008CB417209);贵州省科学技术基金"贵州高硫煤矸石山及其周围土壤重金属污染特征研究"[黔科合LKS字(2009)20];贵州省科学技术基金"快速城镇化进程中贵州典型地区土壤和蔬菜重金属污染的风险评价研究"[黔科合J字(2011)2046]

摘　　要：为探索高硫煤矿煤矸石-土壤体系中Cu的迁移转化规律,用酸性煤矿废水连续浸泡贵阳花溪麦坪煤矿煤矸石及周围农田土壤15d,分析了浸滤液中Cu2+浓度、pH及浸泡前后煤矸石及周围农田土壤中Cu的赋存形态变化。结果表明:煤矸石中硫化物矿物分解释放出Cu和H+,是酸性煤矿废水中Cu2+的来源;煤矸石中有机质和铁的胶体对释放出的Cu有部分吸收作用,在pH降低的条件下,吸附的Cu会解吸于煤矿废水中。土壤对酸性煤矿废水中Cu2+有吸附作用,主要结合于酸溶态和可氧化态中;pH是影响吸附量的最重要因素。土壤对酸性煤矿废水中H+的缓冲作用使土壤中Cu含量随煤矸石堆距离的增加呈先增后降的趋势。受煤矸石降尘的影响,周围旱地土中可能会出现Cu的活化。The coal gangue and surrounding farmland soils were soaked with acidic waste water from Maiping coal mine for 15 d and Cu2＋ concentration,pH and Cu deposition form change in their filtrates were analyzed to study Cu mobility in the high-sulfur coal gangue-soil system.The results showed that Cu and H＋ released from sulfide mineral in coal gangue were the main sources of Cu2＋ in acidic waste water from coal mine,the organic matter and ferric colloids were of Cu partial absorption effect,the absorbed Cu could be desorbed in waste water from coal mine under the lower pH condition,the soil was of Cu2＋ absorption effect in acidic waste water from coal mine and Cu2＋ was combined in the acidic soluble state and oxidizable state,pH was the most important factor affecting Cu absorption.The soil Cu content presents the first increase and then decrease trend with distance increase between soil and coal gangue because of buffering effect of soil on H＋ in acidic waste water from coal mine.Cu in the soil from surrounding dry land may be activated under dust fall of coal gangue.

关 键 词：酸性煤矿废水 煤矸石 农田土壤 铜 赋存形态 

分 类 号：S181.3[农业科学—农业基础科学]