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环境化学  2015 

热传导强化气相抽提处理苯系物污染土壤实验

Keywords: 苯系物,热传导,土壤

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Abstract:

以苯系物(BTEX)污染土壤为研究对象,研究加热源功率和加热时间对土壤苯系物去除率的影响;实验通过分析尾气和冷凝水的污染物浓度来判断实验的终止时间点.结果显示,在3个功率100、200W和400W作用下,各污染物的残留浓度较低,所需要的处理时间分别为168.5、122.5h以及104h,消耗的总电能分别为0.49、0.56KW·h·Kg-1TS以及0.81kW·h·Kg-1TS.功率越高,土壤中BTEX去除效率越高,同时能耗也越大.实验通过分析处理前后土壤中有机质含量,发现在加热的条件下有机质会逐渐减少,功率越高,有机质去除的速率越快,越有利于污染物的去除.本文的结果可证实通过加热可有效提高土壤中苯系物的气相抽提去除效率,对现场中试的开展提供参数依据.

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