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
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摘要
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。
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 m~3/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.
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 m~3/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.
引文
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[7]金卫忠.生活垃圾堆场整治及利用方案研究[D].上海:同济大学,2005.
[8]詹良通,贾官伟,邓林恒,等.湿润气候区固废堆场封场土质覆盖层性状研究[J].岩土工程学报,2012,34(10):1812-1818.
[9]郭敏丽,王金生,刘立才.非正规垃圾填埋场地下水污染控制技术比较[J].水资源保护,2009,25(4):28-30+36.
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[14]LIU Jie,ZHENG Chunmiao,LI Zheng,et al. Ground water sustainability:methodology and application to North China Plian[J]. Ground Water,2008,46(6):897-909.
[15]鞠晓明.地下水污染场地水力控制优化方案研究[D].北京:中国地质大学,2011.
[16]ZHENG Chunmiao,WANG P P. A field demonstration of the simulation optimization approach for remediation system design[J]. Ground Water,2002,40(3):258-266.
[17]LI Fawen,ZHU Jingzhao,DENG Xiyuan,et al. Assessment and uncertainty analysis of groundwater risk.[J].Environmental Research,2018,160:140-151.
[18]中华人民共和国铁道部.铁路工程水文地质勘察规程:TB10049-2004[S].北京:中国铁道出版社,2004.