不同固废基载体材料固定化菌剂的制备及其对复合污染土壤的修复效果比较

Preparation of Immobilized Microbial Agents of Different Solid Waste-Based Carrier Materials and Comparison of Their Remediation Effects on Composite Contaminated Soils

为了更加高效绿色地修复重金属多环芳烃复合污染土壤,将3种PAHs高效降解菌毛霉、黑曲霉和分枝杆菌复配后,选择不同的固废基材料作为载体制备固定化菌剂,考察了不同固定化菌剂对土壤中重金属和多环芳烃的修复效果。结果表明:小麦秸秆在马弗炉700℃无氧煅烧2 h制得的生物炭作为载体的固定化菌剂,对土壤中镉和多环芳烃的修复解效果最好;当投加的固定化菌剂的质量分数为1%时,复合污染土壤中phe(菲)的降解效率高达86.78%以上,pyr(芘)的降解率高达60.77%;污染土壤中Cd的钝化率达到23.99%。

In order to remediate the heavy metal-polycyclic aromatic hydrocarbons(PAHs)composite contaminated soil more efficiently and greenly,three kinds of PAHs highly efficient degrading bacteria,Mucor mucedo,Aspergillus niger and Mycobacterium gilvum SN12,were compounded,and different solid waste-based materials were selected as carriers to prepare immobilized microbial agents,and the remediation effects of different immobilized microbial agents on heavy metals and polycyclic aromatic hydrocarbons in the soil were investigated.The results showed that biochar prepared from wheat straw calcined at 700℃for 2 h was used as an immobilized agent for the carrier,and had the best effect on the remediation of cadmium and polycyclic aromatic hydrocarbons in soil;when the mass fraction of immobilized microbial agent was 1%,the degradation efficiency of phe in the composite contaminated soil was as high as 86.78%,the degradation rate of pyr was as high as 60.77%,and the passivation rate of Cd in the contaminated soil reached 23.99%.