Effects of kaolin-modified loofah sponge biochar on the remediation of PAHs contaminated sediments and microbial response
Kaolin-modified biochar or three-dimensional biochar such as loofah sponge biochar(LSBC)were used to remediate PAH-contaminated sediments in this study and prepared four materials,three-dimensional LSBC(3D-LSBC),three-dimensional K-LSBC(3D-K-LSBC),granular LSBC(G-LSBC),and granular K-LSBC(G-K-LSBC).The result showed that:G-K-LSBC had a significant effect on repairing PAHs-contaminated sediments with the PAHs removal rate of 21.76％and contributed to one order of magnitude improvement in the repair effect.The bioavailability of PAHs in the lower sediments of each group was significantly higher than that in the upper sediments(P＜0.05).The bioavailability of PAHs in sediments was effectively reduced by the addition of G-LSBC and G-K-LSBC,which was 43.99％～78.48％and 39.08％～72.01％,respectively,of the Control group.After 150 days of remediation,there was no significant vertical distribution of PAHs content in sediments(P＞0.05).However,the composition of the sediment microbial community was significantly changed(P＜0.05).The richness and diversity of sediment microbial species were significantly improved with 3D-K-LSBC and G-LSBC.Due to G-K-LSBC,there was significant enrichment of functional bacterial genera with aromatic hydrocarbon degradation and aromatic compound degradation functions in sediment communities.G-K-LSBC exhibited higher potential for PAHs-contaminated sediment remediation.Furthermore,the modification of kaolin significantly improved the stability of LSBC materials.
polycyclic aromatic hydrocarbonscontaminated sedimentskaolin modified loofah sponge biocharremediationmicrobial community
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维普
