典型安全填埋场地下水环境影响评价  

Groundwater EIA of Typical Secure Landfill

作　　者：胡勇[1,2] 杨志勇[3] 赵静[1,3] 严登华[1,3] 

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]安徽省淮河水利委员会水利科学研究院,安徽合肥230088 [3]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038

出　　处：《人民黄河》2014年第8期79-82,共4页Yellow River

基　　金：“十二五”国家科技支撑计划项目(2012BAC19B03);国家自然科学基金资助项目(51021066,51009148)

摘　　要：以杭州湾某安全填埋场为例,在探明水文地质条件的基础上确定研究区范围,并建立研究区水文地质概念模型,使用MODFLOW构建研究区地下水流场和溶质运移模型。结合工程分析结果,确定营运、封场等时段污染源强,并以铬作为特征污染物,运用MT3DMS模拟填埋场渗滤液渗漏增加的地下水铬浓度,采用标准指数法评价模拟结果。结果表明:在局部库区范围内,由填埋场渗滤液渗漏增加的地下水中铬浓度超过水质标准,但不会造成大面积铬浓度超标;填埋场渗滤液渗漏影响地下水是持久的,封场后应尽可能杜绝渗滤液产生,在水力梯度较大的下方向区域可采用工程防污措施减缓对库区外环境的影响。A secure landfill located in Hangzhou Bay was taken as an example to study the groundwater EIA by landfill leachate. The scope of the study area and the hydrogeological conceptual model were determined by the hydrogeological conditions of study area identified by engineering survey and regional hydrogeological report. Groundwater flow field and the solute （taking Cr as the typical pollutant）transport were simulated by the MODFLOW and MT3DMS,respectively. The load of every stage of the landfill was estimated using the empirical formula proposed by Giroud. Using standard index method,the results obtained from the MT3DMS was transformed to an index which charactering the landfill leachate on ground-water. The concentration of chromium in the groundwater under the landfill increased by the leakage from the landfill would exceed water quality standards （GB/T14848）,but the area was limited to part area beneath the landfill. The effect of landfill leachate on groundwater is persistent,so as to leachate generation needs to prevent throughout the life of the landfill,and some reservoir engineering antifouling measures can be used to mitigate the impact of the external environment,especially in the larger area under the direction of high hydraulic gradient.

关 键 词：安全填埋场 地下水 环境影响评价 数值模拟 

分 类 号：X820.3[环境科学与工程—环境工程]