Co-disposal of MSWI fly ash and spent caustic through alkaline-activation consolidation

被引：39
|
作者：
Tian, Xiang [1 ,2 ,3 ]
Rao, Feng [1 ,2 ]
Alberto Leon-Patino, Carlos [2 ]
Song, Shaoxian [3 ]
机构：
[1] Fuzhou Univ, Sch Zijin Min, Fuzhou 350108, Fujian, Peoples R China
[2] Univ Michoacana, CONACYT Inst Invest Met & Mat, Morelia 58030, Michoacan, Mexico
[3] Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430070, Hubei, Peoples R China
来源：
CEMENT & CONCRETE COMPOSITES | 2021年 / 116卷
基金：
中国国家自然科学基金;
关键词：
Spent caustic; MSWI fly ash; Alkaline activation; Co-disposal; Consolidation; POLLUTION CONTROL RESIDUES; INCINERATION BOTTOM ASH; WET AIR OXIDATION; SODIUM-CARBONATE; HEAVY-METALS; SI-29; SLAG; HYDRATION; FTIR; GEOPOLYMER;
D O I：
10.1016/j.cemconcomp.2020.103888
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This work investigates spent caustic as an alkaline activator for the consolidation of municipal solid waste incineration (MSWI) fly ash through the alkaline activation process. The effects of comparable alkalinity of NaOH solution and spent caustic, and the addition of blast furnace slag (BFS) on consolidation MSWI fly ash were investigated. Compressive strength measurement for alkali-activated MSWI fly ash-based mortars was characterized to evaluate the consolidation effect. The microstructure of mortars was characterized by XRD, FTIR, Si-29 NMR, and SEM measurement. It was found that the compressive strength of spent caustic-activated mortars was higher than that of NaOH-activated mortars. The formation of ettringite and more C-(A)-S-H, and the presence of carbonate and organics in spent caustic-activated mortars enhanced the compressive strength. This work found an emerging cost-efficient alkaline activator in waste management through alkaline activation and could achieve environmentally sustainable.
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页数：9
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