微生物胶凝材料固结垃圾焚烧飞灰效果及机制

doi:10.11896/cldb.18110033

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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.

Key words： municipal solid waste incineration (MSWI) fly ash microbial cementing material hydrogen bonds consolidation

Published: 16 September 2019

CLC number:

TU52

Fund:This work was financially supported by the National Natural Science Foundation of China (51502195, 51708390), the Key Projects of Tianjin Natural Science Foundation (16JCZDJC39100), Open Foundation of State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering (2015491611), Open Foundation of Tianjin Key Laboratory of Civil Structure Protection and Reinforcement (JGSYS2017-1).

About author:: Hui Rongis currently a Master's supervisor and an associate director in Department of Inorganic Nonmetallic Materials Engineering, Tianjin Chengjian University. He received his Ph.D. degree in June 2014 from Southeast University. Since joining the work, he has been engaged in the research of the interaction between microorganisms and civil engineering materials. He has hosted 10 vertical and horizontal projects such as the National Natural Science Foundation of China, Tianjin Natural Science Foundation, and participated in two sub-projects of the 13th Five-Year Plan and the 12th Five-Year Plan of National Science and Techno-logy Support. And he was awarded the third prize of Tianjin Science and Technology Progress and the first prize of China Building Materials Federation.
Guanqi Weiis a Master degree candidate in material science and engineering, Tianjin Chengjian University, and mainly focusing on the research of green building materials.

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	RONG Hui
	WEI Guanqi
	ZHANG Lei
	ZHANG Ying
	XU Rui
	NING Caizhen
	WANG Xueping

Cite this article:

RONG Hui,WEI Guanqi,ZHANG Lei, et al. Consolidation of Municipal Solid Waste Incineration Fly Ash by Microbial Cementing Material: Effect and Mechanism[J]. Materials Reports, 2019, 33(22): 3757-3761.

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http://www.mater-rep.com/EN/10.11896/cldb.18110033 OR http://www.mater-rep.com/EN/Y2019/V33/I22/3757

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