某电厂灰渣贮灰场对地下水氟污染影响的淋滤实验研究

Leaching Experimental Research on Influence of Ash Storage Field in a Power Plant on Groundwater Fluorine Pollution

针对某电厂灰场灰渣受到降雨淋滤作用而产生的氟对水环境的影响问题,结合其水文地质条件,采用土柱淋滤实验,对土壤淋滤出的溶液进行水质分析,探讨土壤的渗透性能和氟离子浓度变化的规律。结果表明,贮灰场场区土壤渗透性较差,对氟有吸附作用。贮灰场灰渣受到大气降雨的淋滤作用后对灰场场区及周边地区的浅层地下水影响不大,与实际情况相吻合。同时也说明土柱淋滤实验是一种模拟污水渗入过程、确定包气带防护能力的有效手段。

Aiming at the problem of influence of fluoride on the water environment caused by rainfall leaching in a certain power plant ash storage, through soil column leaching experiments combining with the hydro-geological condition of the as storage to analyze the water quality of soil leached solution, the soil permeability and the fluoride ion concentration change rule are discussed in this paper. The results show that the soil in the ash storage field has poor permeability and adsorption effect to fluorine. The ash in ash storage field after the leaching filtrate action of atmospheric rainfall has little effect on the shallow groundwater in ash storage area and its adjacent area, which is accordance with the actual situation. The result also indicates that the soil column leaching experiment is a kind of effective method to simulate wastewater infiltration process and determine the protection ability of aeration zone.