贵州地区灰场的地下水污染风险评价—以易家寨灰场为例

GROUNDWATER POLLUTION RISK ASSESSMENT ON ASH FIELD IN GUIZHOU:TAKING THE YIJIAZHAI ASH FIELD AS AN EXAMPLE

贵州地区岩溶发育强烈,地下水环境脆弱。实际工作中进行地下水污染风险评价是可持续发展的重要举措。从地下水保护的角度出发,以贵州西南部某煤电一体化电厂灰场的地下水污染风险评价为例,系统收集了该地区地下水位埋深、含水层介质类型、包气带介质类型、植被分布、污染途径和功能用途等资料。针对贵州特殊岩溶地下水特征及灰场灰渣对地下水环境的影响,建立岩溶地区灰场的地下水污染风险评价指标体系,并运用层次分析法确定各指标权重,经权重叠加运算得风险性评价结果,从而确定其风险性。实例结果表明该灰场的风险性评价结果为2.7295,风险性低。将层次分析法应用于灰场地下水风险评价为岩溶发育地区的灰场选址和地下水防渗提供参考。

The environment of groundwater is vulnerable in the area of Guizhou with complex karst. It is important to march groundwater pollution risk assessment in reality. The groundwater pollution by ash field in a power factory of coal-electricity integration in Southwest Guizhou Province has been taken as an example for risk assessment. The documents such as depth of groundwater,aquifer media,vadose zone media,vegetation distribution,pollution mode and function of groundwater has been collected. According to the groundwater characteristics in karst area and the influence of groundwater environment from ash,the groundwater pollution risk assessment index system of ash field in karst area has been built. The AHP method has been applied to calculate the weight of all index and total score of risk. The results showed the total score of risk was 2. 7295,which was not high within the low-risk range. This method had potential applicability for groundwater risk assessment on ash field,which provided a reference for field location in karst area and controlling seepage.