中文版 | English
Title

Safe disposal of hazardous waste incineration fly ash: Stabilization/solidification of heavy metals and removal of soluble salts

Author
Corresponding AuthorZhang,Zuotai
Publication Years
2022-12-15
DOI
Source Title
ISSN
0301-4797
EISSN
1095-8630
Volume324
Abstract
Hazardous waste incineration fly ash (HFA) is considered a hazardous waste owing to the high associated concentrations of heavy metals and soluble salts. Hence, cost effective methods are urgently needed to properly dispose HFA. In this study, geopolymers were prepared by alkali-activation technology to stabilize and solidify heavy metals in HFA. In addition, the effects of three different aluminosilicates (metakaolin, fly ash, and glass powder) on the heavy metal immobilization efficiency were investigated. Because the soluble salt content of HFA is too high for their direct placement in flexible landfill sites and water washing can lead to heavy metal leaching, water-washing experiments were conducted after alkali-activation treatment to remove soluble salts. The results suggest that the concentrations of heavy metals leached from geopolymers can satisfy the Chinese Standard limits (GB18598-2019) when the addition of aluminosilicates exceeds 20 wt%. More than 77% of Cl and >64% of SO in geopolymers could be removed via water-washing treatment. The Zn leaching concentration was maintained below approximately 0.52 ppm. After alkali-activation treatment, the water-washing process could efficiently remove soluble salts while inhibiting heavy metal leaching. Sodium-aluminosilicate-hydrate (N-A-S-H) gel, a product of the geopolymerization process in this study, was demonstrated to act as a protective shell that inhibited heavy metal leaching. Hence, HFA-based geopolymers are considered suitable for disposal in flexible landfills.
Keywords
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
First ; Corresponding
Funding Project
National Key Research and Development Program of China[2018YFC1902904];National Science Fund for Distinguished Young Scholars[52225407];Shenzhen Science and Technology Innovation Program[JCYJ20200109141227141];Shenzhen Science and Technology Innovation Program[JCYJ20200109141437586];Shenzhen Science and Technology Innovation Program[JCYJ20200109141642225];Shenzhen Peacock Plan[KQTD20160226195840229];
WOS Research Area
Environmental Sciences & Ecology
WOS Subject
Environmental Sciences
WOS Accession No
WOS:000874553400006
Publisher
ESI Research Field
ENVIRONMENT/ECOLOGY
Scopus EID
2-s2.0-85138348787
Data Source
Scopus
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/402629
DepartmentSchool of Environmental Science and Engineering
Affiliation
1.School of Environmental Science and Engineering,Southern University of Science and Technology (SUSTech),Shenzhen,518055,China
2.College of Engineering,Peking University,Beijing,100871,China
3.China Everbright Greentech LTD,Hong Kong,Hong Kong
First Author AffilicationSchool of Environmental Science and Engineering
Corresponding Author AffilicationSchool of Environmental Science and Engineering
First Author's First AffilicationSchool of Environmental Science and Engineering
Recommended Citation
GB/T 7714
Wei,Xuankun,Xie,Feng,Dong,Chunling,et al. Safe disposal of hazardous waste incineration fly ash: Stabilization/solidification of heavy metals and removal of soluble salts[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2022,324.
APA
Wei,Xuankun.,Xie,Feng.,Dong,Chunling.,Wang,Pengju.,Xu,Jiyun.,...&Zhang,Zuotai.(2022).Safe disposal of hazardous waste incineration fly ash: Stabilization/solidification of heavy metals and removal of soluble salts.JOURNAL OF ENVIRONMENTAL MANAGEMENT,324.
MLA
Wei,Xuankun,et al."Safe disposal of hazardous waste incineration fly ash: Stabilization/solidification of heavy metals and removal of soluble salts".JOURNAL OF ENVIRONMENTAL MANAGEMENT 324(2022).
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