Consolidation of Municipal Solid Waste Incineration Fly Ash by Microbial Cementing Material: Effect and Mechanism
RONG Hui1,2, WEI Guanqi1, ZHANG Lei1,3, ZHANG Ying1,4, XU Rui1, NING Caizhen1, WANG Xueping1
1 School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin 300384 2 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098 3 Tianjin Construction Waste and Coal-fired Waste Utilization Technology Engineering Center, Tianjin 300384 4 Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin 300384
Abstract: Using ordinary Portland cement to consolidate the municipal solid waste incineration (MSWI) fly ash brings about the problems of large energy consumption and serious environmental pollution. Aiming at relieving this problem, microbial cementing material was employed to consolidate the MSWI fly ash, and its consolidation effect was investigated. Furthermore, the consolidation mechanism of MSWI fly ash by microbial cementing material was analyzed by X-ray diffraction, scanning electron microscopy, infrared spectroscope and atomic absorption spectroscope. Research results demonstrated that the consolidation of loose MSWI fly ash particles as a whole could be achieved by various mixing media, including water, supernatant, bacterial fluid, chemical CaCO3, microbial gelling material, microbial cementing material and supernatant fluid, microbial cementing material and bacterial fluid.While, microbial cementing material and supernatant fluid exhibited superior consolidation strength and consolidation effect of heavy metal ions of MSWI fly ash among those mixing media, presenting 33% and 32% consolidation rate for Pb and Cd, respectively. Regarding to the mechanism, there were dual effects of microbial cementing material in consolidation of MSWI fly ash. Specifically speaking, one action was the generation of the hydrated product (Ca2SiO4· 0.30H2O) which was the same with other consolidation products, another action was the formation of a large number of intermolecular hydrogen bonds resulted from the interaction between the organic matrix in the microbial cementing materialand the O atom of Si-O bonds and C-O bonds in MSWI fly ash and calcite respectively.
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2019, Vol. 33 
