Ochrobactrum intermedium and saponin assisted phytoremediation of Cd and B[a]P co-contaminated soil by Cd-hyperaccumulator Sedum alfredii

被引：31
作者：
Tao, Qi [1 ]
Li, Jinxing [2 ]
Liu, Yuankun [2 ]
Luo, Jipeng [2 ]
Xu, Qiang [1 ]
Li, Bing [1 ]
Li, Qiquan [1 ]
Li, Tingqiang [2 ]
Wang, Changquan [1 ]
机构：
[1] Sichuan Agr Univ, Coll Resources, Chengdu 611130, Peoples R China
[2] Zhejiang Univ, Coll Environm & Resource Sci, Key Lab Environm Remediat & Ecol Hlth, Minist Educ, Hangzhou 310058, Peoples R China
来源：
CHEMOSPHERE | 2020年 / 245卷
基金：
中国国家自然科学基金;
关键词：
Biodegradation; Co-contamination; PAHs; Phytoextraction; Saponin; S; alfredii; POLYCYCLIC AROMATIC-HYDROCARBONS; ENHANCED PHYTOREMEDIATION; HEAVY-METALS; LEAD PHYTOEXTRACTION; LOLIUM-MULTIFLORUM; PTERIS-VITTATA; ELEVATED CO2; PLANT UPTAKE; TEA SAPONIN; PAHS;
D O I：
10.1016/j.chemosphere.2019.125547
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Pot-culture experiments were conducted to investigate the potential of microorganism-saponin assisted phytoremediation of cadmium (Cd) and benzo(a)pyrene (B[a]P) co-contaminated soil using Cd-hyperaccumulator Sedum alfredii. Results showed that B[a]P-degrading bacterium (Ochrobactrum inter-medium B[a]P-16) inoculation significantly increased root (by 22.1-24.1%) and shoot (by 20.5-23.4%) biomass of S. alfredii, whereas the application of saponin had no effect on the growth of S. alfredii. The saponin solution at 2 g L-1 extracted more Cd and B[a]P than water, saponin enhanced Cd and B[a]P bioavailability in soil and thus promoted their uptake and accumulation in S. alfredii. The activity of B[a]P-16, dehydrogenase and polyphenol oxidase in co-contaminated soil was promoted by growing S. alfredii, and the application of B[a]P-16 and saponins caused a significant (P < 0.05) increase in both enzyme activities. The maximum B[a]P removal rate (82.0%) and Cd phytoextraction rate (19.5%) were obtained by co-application of S. alfredii with B[a]P-16 and saponin. The B[a]P-16 and plant promoted biodegradation were the predominant contributors towards removal of B[a]P from soil. A significant (P < 0.05) synergistic effect of B[a]P-16 and saponin on B[a]P and Cd removal efficiency was observed in this study. It is suggested that planting S. alfredii with application of B[a]P-16 and saponin would be an effective method for phytoremediation of soil co-contaminated with Cd and PAHs. (C) 2019 Published by Elsevier Ltd.
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页数：9
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