基于数值模拟的某临河工业固体废物渣场地下水污染控制研究

简易渣场无规范环保措施,是地下水和土壤的重要污染源。针对简易渣场,以彻底清除污染源和重新规范渣场建设为优先方案,但确无条件实施上述方案时,一些地方也采用封场配套物理阻隔和抽出-处理等措施,最大程度控制和缓解渣场对周边地下水环境的影响。以某临河工业渣场为例,建立了就地封场、就地封场联合水动力阻隔、就地封场联合防渗帷幕及抽出-处理方案的Modflow模型,模拟了各方案的控制效果。结果表明:封场虽可较快恢复渣场区地下水质量,但并未从根本上消除污染物;封场基础上在临河侧设置抽水量170 m~3/d的水井1口亦有较好的控制效果,但存在运行管理困难的问题;封场基础上联合帷幕注浆及抽出-处理,相对有一定优势,但运行管理仍有一定难度。因此,若条件允许,最好的方案仍是彻底清除污染源或重新规范渣场建设。

Research on groundwater pollution control of a riverside industrial solid waste slag field based on numerical simulation

Simple slag without standardized environmental protection measures is an important source of groundwater and soil pollution. Completely removing pollution sources or re-regulating it is a priority plan. However, when unconditionally implementing the above schemes, some places also adopt measures such as physical barrier and extraction-treatment based on field sealing to minimize the impact of slag yards on groundwater environment. Taking a riverside industrial solid waste slag as an example, the Modflow models of in-situ closure, in-situ closure combined hydrodynamic barrier, in-situ closure combined seepage proof and extraction-treatment schemes were established. The numerical simulation results showed that: although the quality of groundwater around the slag would recover in a relatively short time, the pollutants can''t be eliminated completely; a well with pumping capacity of 170 m³/d based on in-situ closure also has good control effect, but it has some problems in operation and management;combining curtain grouting and pumping-treatment based on in-situ closure has some comparatively advantages, but the operation management is still difficult. Therefore, the best solution is to completely eliminate the source of pollution or re-regulate the slag, if conditions permit.