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脉冲放电等离子体修复芘污染土壤的影响因素

DOI: 10.13336/j.1003-6520.hve.2015.10.045, PP. 3512-3517

Keywords: 脉冲放电等离子体,,土壤粒径,土壤初始pH值,土壤初始含水体积分数,芘初始质量分数

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Abstract:

为了说明脉冲放电等离子体修复体系中的主要参数对有机污染土壤修复效果的影响规律,以芘这一典型的多环芳烃持久性有机污染物为目标物,建立了针对芘污染土壤的针-网式脉冲放电等离子体修复体系,考察了主要土壤参数包括土壤粒径、土壤初始pH值、土壤初始含水体积分数、土壤中芘初始质量分数的变化对土壤中芘降解速率的影响规律。研究结果表明1mm粒径土壤中的芘降解速率常数比2mm粒径土壤中的芘降解速率常数高;土壤初始pH值是影响脉冲放电等离子体修复体系中土壤修复效果的关键因素,酸性土壤比中性和碱性土壤更利于其中芘的降解,酸性土壤条件下的芘降解速率常数为0.05976;土壤初始含水体积分数增加导致土壤孔隙减少,不利于活性物质的传输而降低了修复效果;随着土壤中芘初始质量分数的增加,芘降解速率常数降低。

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[25]  通信作者: 王慧娟,1980—,女,博士,副教授,硕导,主要从事等离子体化学反应工程方面的研究,E-mail: hjwang@ujs.edu.cn

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