Microbial Induced Solidification of Municipal Solid Waste Incineration Fly Ash
To investigate the applicability of microbial induced calcite precipitation (MICP) to the solidification of municipal solid waste incineration (MSWI) fly ash, the following work are carried out. Firstly, three ureolytic strains, UR1, UR2 and UR3, were isolated and identified as Sphingobacterium cladoniae, Bacillus aryabhattai and Raoultella ornithinolytica, respectively. Secondly, the fly ash samples were solidified by the above three strains, and the case with strain UR2 displayed largest unconfined compressive strength of 0.740 MPa. Lastly, heavy metal leaching test was carried out for the solidified samples. The immobilization ratios for Cu, Pb, and Cd were in the range of 41–77%. The case with UR1 displayed higher immobilization ratios for Cu, Cr, and Cd, and UR2 exhibited higher immobilization ratio for Pb. Overall, strains UR1 and UR2 provide promising use for the solidification of MSWI fly ash.
KeywordsMSWI fly ash Heavy metal Immobilization rate Microbial induced calcite precipitation (MICP)
We are grateful to Dr. Greg Duns for his valuable comments on the paper.
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