Preparation of Ceramic-Volcanic Immobilized Carrier and Remediation of Oil-contaminated Soil
In order to improve the remediation effect of oil contaminated soil,ceramic particle volcanic rock compos-ite carrier was prepared by improving the stirring crosslinking method,and immobilization of microorganisms/laccase.Afterwards,SEM,BET,FTIR,and soil biological characteristics were combined to analyze the properties of immobi-lized carriers and their differences in the remediation of petroleum contaminated soil.One of the results shows that the composite carrier of ceramic particles and volcanic rocks has an improved petroleum hydrocarbon adsorption perfor-mance by about 50％compared to a single carrier.At the same time,the immobilized carrier prepared increased its spe-cific surface area by 3.1％～51.1％and pore volume by 8.6％～50.9％.The immobilized microbial load reaches the order of 109 cells/g.The proportion of living cells stored for 15 days reached 60.89％.The relative activity of immobilized laccase remains above 19％after 5 cycles of recycling,and about 56％after 30 days of storage.The highest remediation effect of soil petroleum hydrocarbons is 58.98％(immobilized bacteria enzyme complex preparation).Soil dehydroge-nase,urease,catalase and polyphenol oxidase were significantly improved.And there is a significant positive correlation with petroleum hydrocarbons.The microbial structure analysis showed that adding immobilized carrier would change the soil microbial community structure and lead to the emergence of dominant species,including Pseudomonas,Virgiba-cillus and Oceanobacillus.
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