Upcycling of air pollution control residue waste into cementitious product through geopolymerization technology

被引:21
作者
Ahmad, Muhammad Riaz [1 ]
Lao, Jiancong [1 ]
Dai, Jian-Guo [1 ]
Xuan, Dongxing [1 ]
Poon, Chi Sun [1 ]
机构
[1] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China
关键词
Air pollution control residue; Geopolymer; Solidification; Leaching; Sewage sludge; SEWAGE-SLUDGE ASH; FLY-ASH; COMPRESSIVE STRENGTH; PLASMA TREATMENT; BOTTOM ASH; INCINERATION; MANAGEMENT; IMPACTS;
D O I
10.1016/j.resconrec.2022.106231
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study explores the possibility of using geopolymerization technology (GT) to immobilize the potentially toxic elements (PTEs, e.g., Zn, Cu, Cr, As) in the APCr and convert it into useful cementitious product. To maximize its recycling, the amount of APCr in the designed product was increased gradually from 20% to 80% by the total solid mass. Leaching test showed that GT can effectively immobilize the PTEs in the APCr solidified samples without any health and environmental concerns. The compressive strength of samples can exceed 18 MPa at 28 days at a highest amount of 80% APCr through GT. Thermogravimetric analysis (TGA) results showed that solidified samples underwent mass loss due to evaporation of free and physically bound water at low temperatures (< 200 degrees C) and melting and evaporation of soluble salts in APCr at high temperatures (> 800 degrees C). Characterization of solidified samples conducted through the X-ray diffraction (XRD), Fourier transform infrared (FTIR) and Scanning electron microscopy-Energy dispersive analysis (SEM) revealed the formation of C-A-S-H and N-A-S-H gels in solidified bodies and verified that APCr was successfully solidified and embedded into the geopolymer network structure
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页数:11
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