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

摘要/Abstract

摘要： 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。

Abstract: Wastewater treatment plants produce large amounts of sludge that contain high concentrations of toxic polycyclic aromatic hydrocarbons (PAHs), which would pollute agricultural soil and field crops if the sludge had not been treated properly. In this study, pot experiments with different sludge-to-soil ratios (W0%,sludge-to-soil ratio 0∶1;W25%,1∶3;W50%,1∶1;W75%,3∶1;W100%,1∶0) were conducted to determine the phytoremediation effects of Awnless Brome (smooth bromegrass) on PAH-contaminated sludge. The results show that increases in the sludge/soil ratio did not produce significant differences in the stem length of smooth bromegrass. However, biomass exhibited a pronouncedrising trend. In general, smooth bromegrass showed a strong tolerance to the presence of sludge. The absorption of 14 PAHs in total was the highest in treatment W100%, and the absorption of PAHs with 3 and 4 rings was higher than that with other-numbered rings. There was no significant difference in the removal rate of 14 PAHs in total between treatments W50%, W75% and W100%, and the maximal removal rate of 85.4% was found with treatment W75%. The removal of Pyr, Chry, BaA, BbF, BkF, BaP and InP was more effective than that of the other PAHs, with higher than 80% removal rates. Our results suggest that smooth bromegrass could be used as a plant resource for the remediation of PAH-contaminated sludge, given both its strong tolerance to sludge and its high uptake and removal rate of PAHs. A sludge/soil ratio of 3∶1 was found to be the optimal condition for remediation.

王伟, 冯圣东, 杨志新, 常瑞雪, 李玉灵, 王小敏. 无芒雀麦-污泥系统中泥/土不同比例对PAHs修复效果的影响[J]. 草业学报, 2015, 24(2): 148-160.

WANG Wei, FENG Shengdong, YANG Zhixin, CHANG Ruixue, LI Yuling, WANG Xiaomin. Effects of sludge/soil ratio on the remediation of PAH-contaminated sludge by smooth bromegrass[J]. Acta Prataculturae Sinica, 2015, 24(2): 148-160.

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