Article
Engineering, Environmental
Zongshuai Yuan, Guangkai Cai, Longfei Gao, Min Wu, Lingxue Kong, Jin Bai, Zongqing Bai, Huaizhu Li, Wen Li
Summary: Thermal treatment is a promising technology for the treatment of municipal solid waste incineration (MSWI) fly ash due to its detoxification and volume reduction. However, the relationship between heavy metal immobilization and mineral transformation during thermal treatment is still unclear. This study investigated the immobilization mechanism of Zn during the thermal treatment process of MSWI fly ash through experimentation and calculation. The results suggest that adding SiO2 promotes the transition of dominant minerals and improves the liquid content and polymerization degree, leading to the physical encapsulation of ZnCl2 and the chemical fixation of ZnO. The order of mineral's chemical fixation ability to ZnO is spinel > melilite > liquid > anorthite. The findings provide insights into the immobilization mechanism of heavy metals during thermal treatment and help prevent the volatilization of heavy metals.
Article
Biochemistry & Molecular Biology
Facun Jiao, Xulong Ma, Tao Liu, Chengli Wu, Hanxu Li, Zhongbing Dong
Summary: The study found that thermal treatment of municipal solid waste incineration fly ash in a reducing atmosphere can promote ash melting and prevent heavy metal vaporization.
Article
Engineering, Environmental
Xuexue Wang, Lei Zhang, Kongyun Zhu, Changjing Li, Yulin Zhang, Aimin Li
Summary: This study investigates the distribution and transition behavior of chlorides in fly ash during pressure-assisted sintering process. The results show that pressure-assisted sintering can effectively decrease the chloride leaching concentration, stabilize chlorides, and improve recycling efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Xinyuan Zhan, Gunvor Marie Kirkelund
Summary: The study explored the use of electrodialytic remediation (ED) as a pre-treatment to remove heavy metals from MSWI fly ash before geopolymerization. The pre-treatment increased the reactivity of Si and Si/Al ratio in fly ash. A mixture of 80% coal fly ash and 20% ED treated fly ash with 8 M NaOH was found to have optimal compressive strength in geopolymerization.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Applied
Guiyun Yang, Qiangqiang Ren, Li Zhou, Pengpeng Li, Qinggang Lyu
Summary: SiO2 and Al2O3 are suitable additives for municipal solid waste incineration fly ash melting. The addition of SiO2 or Al2O3 significantly promotes the release of HCl. SiO2 has an obvious effect on reducing Cl percentage in residues, while Al2O3 is more likely to retain Cl in the residues.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Environmental Sciences
Chunlong Zhao, Shujie Lin, Youcai Zhao, Kunsen Lin, Lu Tian, Mengqin Xie, Tao Zhou
Summary: During the thermal treatment of municipal solid waste incineration fly ash, the migration behaviors of chlorine and metal ions have a significant impact on the harmless and resource of fly ash. It was observed that heavy metals and chlorides showed consistent migration behaviors when the roasting temperature was above 750 degrees Celsius.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Materials Science, Ceramics
Zhikun Zhang, Zhichuan Li, Yibo Yang, Boxiong Shen, Jiao Ma, Lina Liu
Summary: In this study, municipal solid waste incineration fly ash was recycled into environmentally friendly glass-ceramics. The effects of different parameters on the crystalline phases, mechanical properties, and heavy metals leaching of the glass-ceramics were investigated. The results showed that the glass-ceramics exhibited stable crystalline phases, good mechanical properties, high alkali resistance, and low potential ecological risk, indicating their potential application feasibility.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Environmental
Xinyuan Zhan, Li'ao Wang, Jin Wang, Zhengbo Yue, Rui Deng, Yan Wang, Xiaowei Xu
Summary: In this study, a low-aluminum-silicon lightweight ceramisite was successfully prepared as a replacement for traditional lightweight aggregates. The resulting ceramisite met the requirements of commercial lightweight aggregates and posed no harm to the environment and human health.
Article
Green & Sustainable Science & Technology
Siyu Han, Kailun Chen, Fanzhi Meng, Yuchen Gao, Jinglin Li, Li Lin, Weikai Qin, Jianguo Jiang
Summary: This study presents a novel pH-controlled sulfuric acid washing method for municipal solid waste incineration fly ash (FA) to enhance heavy metal stabilization and enable the co-recycling of FA and waste sulfuric acid. The leaching rate of heavy metals was significantly reduced by controlling the pH during sulfuric acid washing, and the use of sulfuric acid washed FA (SFA) in lightweight aggregate production improved heavy metal stabilization. XPS analysis further investigated the transformation of heavy metals into stable states during washing and sintering. This study offers insights into the mechanism of heavy metal stabilization and provides an environmentally sustainable solution for FA treatment.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Sihua Xu, Hongyun Hu, Guangzhao Guo, Lifang Gong, Huimin Liu, Hong Yao
Summary: The study demonstrates that molten salt thermal treatment technology has a good effect on the thermal detoxification of MSWI fly ash. The main components and physical properties of used molten salts change during cycling reuse, with increasing concentrations of K+ and SO42- and decreasing Cl-. Different salt components have varying effects on the thermal properties of molten salts, with KCl having the greatest influence on the specific heat capacity.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Chengcheng Fan, Baomin Wang, Yi Qi, Ze Liu
Summary: A novel binder system using MgO and silica fume was developed for solidification/stabilization of MSWI fly ash. The blend showed good compressive strength and controlled leaching behavior of heavy metals, providing a promising method for immobilization of heavy metals in MSWI fly ash.
Article
Engineering, Environmental
Yicheng Wang, Lu Dong, Hongyun Hu, Dahai Yan, Sihua Xu, Chan Zou, Yongda Huang, Guangzhao Guo, Hong Yao
Summary: Molten salt thermal treatment is effective in dissolving heavy metals in MSWI fly ash, but the reactions during the process are not well understood. This study investigated the migration and transformation mechanisms of heavy metals during cyclic thermal treatment at different temperatures. The results showed that molten salts can extract heavy metals and reduce their leaching toxicity in the reacted slags. The reaction characteristics of heavy metals varied, and increasing the temperature facilitated their chlorination and dissolution. Recovery of heavy metals can be achieved by concentrating them on the insoluble matters of molten salt.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Xuexue Wang, Lei Zhang, Kongyun Zhu, Changjing Li, Yulin Zhang, Aimin Li
Summary: The study utilized pressure-assisted sintering method to treat MSWI fly ash, producing high-strength ceramic products with compressive strength significantly higher than conventional construction materials, while heavy metals leaching concentrations were below the standard limit. Increased mechanical properties and decreased heavy metals leaching concentrations were mainly attributed to the increased density and crystalline degree.
Article
Engineering, Environmental
Eirik Nost Nedkvitne, Ornulf Borgan, Dag Oistein Eriksen, Haakon Rui
Summary: Our society generates a large amount of municipal solid waste (MSW), which is mainly incinerated for volume reduction and energy recovery, but incineration produces hazardous air pollution control (APC) residues that need proper treatment. Material recovery as an alternative to landfilling can reduce hazardous waste amounts and regenerate valuable products. Variations in chemical composition of APC residues within and between incineration plants were investigated, with significant differences found in chemical composition of APC residues from countries other than Sweden and Norway, emphasizing the importance of holistic approaches for waste valorization processes.
Article
Construction & Building Technology
Lijuan Su, Guosheng Fu, Bing Liang, Qi Sun, Xiangdong Zhang, Zhen Shen
Summary: This study proposes a scheme for goaf filling using MSWI fly ash as a solution to the problems of MSWI fly ash with no place stacking and the lack of filling materials in goaf. The effects of curing temperature, activator dosage, and MSWI fly ash content on the properties of filling materials were investigated. The results show that increasing the curing temperature improves the compressive strength, degree of polymerization, and heavy metal curing rate of the material. The amount of activator used and the MSWI fly ash content affect the pore structure of the material.
CONSTRUCTION AND BUILDING MATERIALS
(2022)