电厂粉煤灰场氟离子对地下水影响的试验

Experimental Study on Influence of Fluorine Ions Produced by Fly Ash Pond of Power Plant on Groundwater

在总结前人研究的基础上得知,在自然淋溶条件下,氟离子经常超过生活饮用水卫生标准甚至经常超过污水综合排放标准,是粉煤灰中的主要污染因子。通过室内淋溶试验模拟大气降水对粉煤灰的淋溶过程,以氟离子为模拟因子分析淋溶液对土壤和浅层地下水水质的影响,模拟试验结果表明:不同土层对氟离子都有不同程度的吸附能力;位于不同地层的干灰场对地下水影响不同,并且在干灰场底部增加黏土作为防渗层,可有效缓解其对地下水的污染。

The coal ash contains massive trace elements. During their long-term storage process, as the result of the rain water leaching, they possibly cause the pollution of groundwater environment. On the basis of summarizing the predecessor＇s studies, F^- often exceeds hygiene standard on drinking water, even exceed comprehensive drainage standard on waste water under natural leaching conditions, and is the main pollution factor in the coal ash. Through the leach experiment indoor, in which F^- is considered as a simulation factor, the process of atmosphere precipitation to the coal ash is simulated to analyze the influence of the solution to the soil and th e shallow layer groundwater quality. It is found from the simulation that different soil layer has varying degree of F^- adsorptive capacity, the dry ash field located in different strata influences the groundwater differently and it can effectively alleviate the pollution of the groundwater by adding the clay as against infiltration level on the dry fly ash pond base.