Remediation of PAH-contaminated sediments by Vallisneria natans and its associated microbes
Submersed macrophytes Vallisneria natans(V.natans)possess the potential to restore the polycyclic aromatic hydrocarbons(PAHs)-contaminated sediments.However,the partnership between V.natans and microbes in degrading PAHs were still not well understood.Remediation effect of V.natans to PAHs in Dashui Harbor under different sterilization conditions was investigated.Over 15-day remediation experiment,the removal rate of PAHs in sterilized sediment treatment,sterilized rhizoplane treatment and sterilized both sediment and rhizoplane treatment were 41.81%,31.81%and 25.19%,respectively.The microbial community structure showed that the microorganisms in the rhizosphere and non-rhizosphere sediments of V.natans were mainly composed of Proteobacteria,Chloroflexi,Acidobacteria,Bacteroidetes and Actinobacteria,while the root surface and root interior of V.natans were also enriched with significantly different microorganisms.Proteobacteria were mainly found on the root surface and root interior,and their abundances were 88.5%and 67.7%,respectively.Further analysis showed that the dominant genera were Acinetobacter,Pseudomonas and Herbaspirillum.The results showed that the microbial community in sediment and on rhizoplane can both contribute to the degradation of PAHs.The exist of activity V.natans may promote the recovery of the potential of microbial degrading PAHs in sterilized sediment,thus synergizing with microbes in V.natans,accelerating the degradation of PAHs in sediment.
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