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草业学报  2015 

无芒雀麦-污泥系统中泥/土不同比例对PAHs修复效果的影响

DOI: 10.11686/cyxb20150217, PP. 148-160

Keywords: 无芒雀麦,PAHs污染修复,泥/土组合,最佳组合比例,去除率

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Abstract:

城市污水处理厂污泥中含有较高浓度的有毒有害物质多环芳烃(PAHs),且污泥产量大,如果不经过处理直接农业利用或堆放会导致土壤和作物的污染。本研究利用污泥和土壤不同配比组合(W0%,泥土比0∶1;W25%,泥土比1∶3;W50%,泥土比1∶1;W75%,泥土比3∶1;W100%,泥土比1∶0)的盆栽试验,探讨无芒雀麦-污泥系统对污泥多环芳烃的修复效果。研究结果表明,随污泥含量增加对无芒雀麦株高的影响差异不明显,而生物量却呈现出明显的上升趋势。无芒雀麦对污泥的耐受性表现良好;无芒雀麦对泥/土组合14种PAHs的吸收总量以W100%处理最高,且对3环、4环多环芳烃的吸收量比其他环数优势明显;在不同泥/土组合处理下,无芒雀麦-污泥系统对泥/土14种PAHs总量的去除率在W50%、W75%、W100%处理间没有明显差异,以W75%组合去除率为最高,达85.4%。且含有污泥的所有组合对高环芳烃Pyr、Chry、BaA、BbF、BkF、BaP、InP单体的去除优势表现非常突出,均达到80%或90%以上。综合考虑无芒雀麦的生长状况、吸收量及去除率认为,将耐抗性和去除率高的无芒雀麦作为优选植物资源直接用于城市污泥PAHs的修复是可行的,且以泥土比3∶1为最佳修复组合。

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