Stabilisation/solidification of municipal solid waste incineration fly ash by phosphate-enhanced calcium aluminate cement

Chen, Liang1; Wang, Yan-Shuai1; Wang, Lei2; Zhang, Yuying1; Li, Jining3; Tong, Lizhi4,5; Hu, Qing5; Dai, Jian-Guo1; Tsang, Daniel C. W.1

2021-04-15

10.1016/j.jhazmat.2020.124404

JOURNAL OF HAZARDOUS MATERIALS   影响因子和分区

0304-3894

1873-3336

Landfill disposal of municipal solid waste incineration fly ash (MIFA) presents significant environmental and economic burden. This study proposed a novel and high-efficiency approach for stabilisation/solidification (S/S) of MIFA by phosphate-modified calcium aluminate cement (CAC). Experimental results showed that the presence of Pb (the most leachable metal contaminant in the MIFA) retarded the early-stage reaction of CAC, resulting in an extension of setting time and a significant decline of compressive strength of CAC pastes. The incorporation of phosphate additives (10 wt% of binder), especially for trisodium phosphate, in CAC system effectively mitigated the negative impact of Pb on the CAC reaction and reduced the Pb leachability. Elemental mapping results illustrated that Pb2+ coordinated with phosphate to generate insoluble precipitates (e.g., Pb-3(PO4)(2)). The S/S treated MIFA samples fulfilled the compressive strength and leachability requirements for on-site reuse. Overall, this study demonstrated that phosphate-modified CAC is a promising binder for S/S of hazardous MIFA.

Hazardous waste treatment High-alumina cement Phosphate additives Green and sustainable remediation Metal leachability

SCI ; EI

英语

ESI高被引

其他

Hong Kong Research Grants Council, China[E-PolyU503-17]

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:000620379100005

ELSEVIER

20204509473022

Alumina ; Compressive strength ; Additives ; Stabilization ; Waste incineration ; Waste treatment ; Sodium Aluminate ; Aluminum oxide ; Leachate treatment ; Hazards ; Municipal solid waste

Municipal and Industrial Wastes; Waste Treatment and Disposal:452 ; Industrial Wastes Treatment and Disposal:452.4 ; Chemical Agents and Basic Industrial Chemicals:803 ; Inorganic Compounds:804.2 ; Accidents and Accident Prevention:914.1

ENGINEERING

Web of Science

1.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Kowloon, Hung Hom, Hong Kong, Peoples R China
2.Tech Univ Dresden, Inst Construct Mat, D-01062 Dresden, Germany
3.Nanjing Normal Univ, Sch Environm, Nanjing 210023, Jiangsu, Peoples R China
4.Minist Ecol & Environm, South China Inst Environm Sci, 7 West St, Guangzhou 510655, Peoples R China
5.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

Chen, Liang,Wang, Yan-Shuai,Wang, Lei,et al. Stabilisation/solidification of municipal solid waste incineration fly ash by phosphate-enhanced calcium aluminate cement[J]. JOURNAL OF HAZARDOUS MATERIALS,2021,408.

Chen, Liang.,Wang, Yan-Shuai.,Wang, Lei.,Zhang, Yuying.,Li, Jining.,...&Tsang, Daniel C. W..(2021).Stabilisation/solidification of municipal solid waste incineration fly ash by phosphate-enhanced calcium aluminate cement.JOURNAL OF HAZARDOUS MATERIALS,408.

Chen, Liang,et al."Stabilisation/solidification of municipal solid waste incineration fly ash by phosphate-enhanced calcium aluminate cement".JOURNAL OF HAZARDOUS MATERIALS 408(2021).