NDLI: Pig manure vermicompost (PMVC) can improve phytoremediation of Cd and PAHs co-contaminated soil by Sedum alfredii

Content Provider	Springer Nature Link
Author	Wang, Kai Zhang, Jie Zhu, Zhiqiang Huang, Huagang Li, Tingqiang He, Zhenli Yang, Xiaoe Alva, Ashok
Copyright Year	2012
Abstract	A major challenge to phytoremediation of co-contaminated soils is developing strategies for efficient and simultaneous removal of multiple pollutants. A pot experiment was conducted to investigate the potential for enhanced phytoextraction of cadmium (Cd) by Sedum alfredii and dissipation of polycyclic aromatic hydrocarbons (PAHs) in co-contaminated soil by application of pig manure vermicompost (PMVC).Soil contaminated by Cd (5.53 mg kg$^{−1}$ DW) was spiked with phenanthrene, anthracene, and pyrene together (250 mg kg$^{−1}$ DW for each PAH). A pot experiment was conducted in a greenhouse with four treatments: (1) soil without plants and PMVC (Control), (2) soil planted with S. alfredii (Plant), (3) soil amended with PMVC at 5 % (w/w) (PMVC), and (4) treatment 2 + 3 (Plant + PMVC). After 90 days, shoot and root biomass of plants, Cd concentrations in plant and soil, and PAH concentrations in soil were determined. Abundance of PAH degraders in soil, soil bacterial community structure and diversity, and soil enzyme activities and microbial biomass carbon were measured.Application of PMVC to co-contaminated soil increased the shoot and root dry biomass of S. alfredii by 2.27- and 3.93-fold, respectively, and simultaneously increased Cd phytoextraction without inhibiting soil microbial population and enzyme activities. The highest dissipation rate of PAHs was observed in Plant + PMVC treatment. However, neither S. alfredii nor PMVC enhanced PAH dissipation when applied separately. Abundance of PAH degraders in soil was not significantly related to PAH dissipation rate. Plant + PMVC treatment significantly influenced the bacterial community structure. Enhanced PAH dissipation in the Plant + PMVC treatment could be due to the improvement of plant root growth, which may result in increased root exudates, and subsequently change bacterial community structure to be favorable for PAH dissipation.This study demonstrated that remediation of Cd and PAHs co-contaminated soil by S. alfredii can be enhanced by simultaneous application of PMVC. Long-term evaluation of this strategy in co-contaminated field sites is needed.
Starting Page	1089
Ending Page	1099
Page Count	11
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	12
Issue Number	7
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-05-31
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cadmium Co-contamination Hyperaccumulator Organic fertilizer Phytoremediation Polycyclic aromatic hydrocarbons Environment Soil Science & Conservation Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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