Effects of sludge/soil ratio on the remediation of PAH-contaminated sludge by smooth bromegrass

doi:10.11686/cyxb20150217

Abstract

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.

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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