Article
Engineering, Environmental
Zhikun Zhang, Yanli Wang, Yuqi Zhang, Boxiong Shen, Jiao Ma, Lina Liu
Summary: This study investigated the stabilization behavior of heavy metals in hazardous municipal solid waste incineration fly ash (FA) using coal fly ash (CFA) as an additive via hydrothermal treatment. The results showed that most heavy metals were stabilized in the hydrothermal product, and the addition of CFA resulted in the reduction of leaching concentrations and risk assessment code (RAC) of heavy metals. The method with 30% CFA exhibited the most superior performance.
Article
Environmental Sciences
Weichen Yang, Xing Cao, Qiushi Zhang, Rui Ma, Lin Fang, Shiwei Liu
Summary: This study proposes a two-step treatment strategy of microwave hydrothermal degradation coupled with geopolymer immobilization to improve the degradation efficiency of persistent organic pollutants in municipal solid waste incineration fly ash. The results show that microwave hydrothermal dechlorination at a temperature of 220°C, a time of 1 hour, and NaOH addition of 10 wt% is optimal. The alkaline environment provided by microwave hydrothermal promotes the formation of Friedel's salt, which immobilizes heavy metals and chloride ions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Thermodynamics
Agata Mlonka-Medrala, Tadeusz Dziok, Aneta Magdziarz, Wojciech Nowak
Summary: In this study, the potential of Refuse Derived Fuel (RDF) in Poland was investigated, revealing significant limitations due to its high heterogeneity and contamination. Samples of fuel and fly ashes were analyzed to determine their composition and characteristics, while the impact of flue gas treatment on ash morphology and composition was also studied.
Article
Construction & Building Technology
Yanli Wang, Jiao Ma, Longbang Qing, Lina Liu, Boxiong Shen, Shuhao Li, Zhikun Zhang
Summary: This study investigated the carbonation pretreatment of municipal solid waste incineration fly ash (FA) with different carbonate solutions to improve its recyclability by converting it to geopolymers with coal fly ash (CFA). The results showed that the carbonate solutions changed the mineral phases of FA and affected the properties of geopolymers. Geopolymers prepared with Na-FA exhibited the best performance, with a denser microstructure and better compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Energy & Fuels
Xing Chuai, Qinghua Yang, Tiantian Zhang, Yongchun Zhao, Jiang Wang, Guodong Zhao, Xiangzheng Cui, Yili Zhang, Tianle Zhang, Zhuo Xiong, Junying Zhang
Summary: Fly ash from municipal solid waste incineration (MSWI) is classified as hazardous waste due to its high content of heavy metals, dioxins, and other hazardous substances. This study investigated the physical and chemical properties, enrichment pattern, fugacity pattern, and leaching toxicity of four types of MSWI fly ash. The results showed that the content and distribution of heavy metals were influenced by particle size and the injection of CaO.
Article
Construction & Building Technology
Dapeng Zheng, Dongmin Wang, Hongzhi Cui, Xiangsheng Chen
Summary: This study focused on enhancing the pozzolanic activity of circulating fluidized bed fly ash (CFBFA) through ultrafine grinding. The findings revealed that physical activation can improve the early hydration reaction and later strength of cement with CFBFA. The research provides insights for the stability improvement and large-scale application of CFBFA-based cement.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Environmental
Narihito Ogawa, Takahito Amano, Yoshitaka Nagai, Kenta Hagiwara, Takayuki Honda, Yuya Koike
Summary: The study examined the suppression of heavy metal elution from municipal solid waste incineration (MSWI) fly ash using cement or geopolymer solidification. However, it was found that the volume of the solidified body increases with the addition of solidifying agents, necessitating the need for a novel method to suppress heavy metal elution without decreasing disposal capacity. The use of water repellents such as commercially available silane oligomers, alkyl alkoxysilane compounds, and fatty acids was found to effectively suppress heavy metal elution.
Article
Construction & Building Technology
Xiaodong Ma, Tingshu He, Yongdong Xu, Yongqi Da, Hui Wang, Renhe Yang
Summary: This paper summarizes numerous studies and proposes the composite sintering of circulating fluidized bed incineration fly ash with limestone powder. The effects of composite sintering on the physicochemical properties of circulating fluidized bed incineration fly ash and the performance of cement were studied. The results show that composite sintering can effectively decompose chlorine and dioxins, increase the activity of volcanic ash, and produce new minerals. The prepared cement can solve cracking issues, reduce water demand, and increase compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Ceramics
Jian Li, Zhibin Ma, Jianming Gao, Yanxia Guo, Fangqin Cheng
Summary: Using circulating fluidized bed fly ash (CFBFA) to prepare geopolymer as a substitute for cement can reduce CO2 emissions and solve environmental problems. The effects of alkali activator modulus and curing temperature on the mechanical properties of geopolymers were investigated, and their relationship with phase composition, micromorphology, and chemical structure was established. The results show that the compressive strength of geopolymer decreases with the increase of alkali activator modulus and increases with the increase of curing temperature, but decreases after 28 days. The 90 days compressive strength reaches 34.7 MPa under certain conditions.
CERAMICS INTERNATIONAL
(2022)
Article
Construction & Building Technology
Chun-Ran Wu, Bao-Jian Zhan, Zhi-Qiang Hong, Shi-Cai Cui, Peng Cui, Shi-Cong Kou
Summary: The hydration behavior of circulating fluidized bed fly ash (CFBFA) as a cementitious binder in a CFBFA-lime system was investigated. It was found that the hydration behavior of the mixtures changed as the lime content increased, and the hydration reaction of the mixtures could continue after Ca(OH)2 was depleted.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Environmental Sciences
Qi Zhou, Xuguang Jiang, Qili Qiu, Yimeng Zhao, Ling Long
Summary: This study focuses on the fabrication of zeolite from municipal solid waste incineration fly ash (MSWI FA) using microwave-assisted hydrothermal treatment. It systematically analyzes the effects of various factors on the crystallization of zeolite from MSWI FA. The results demonstrate that zeolite with high crystallinity can be successfully synthesized using magnetic stirring and microwave-assisted hydrothermal treatment. Additionally, the synthetic zeolite exhibits excellent adsorption capacity for heavy metals and dyes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Green & Sustainable Science & Technology
Jiawei Li, Zhichao Chen, Liankai Li, Yanyu Qiao, Zhenhua Yuan, Lingyan Zeng, Zhengqi Li
Summary: The study found that coal gasification fly ash (CGFA) has a developed pore structure and high carbon content, with loose carbon structure and good chemical reaction activity, making it suitable for secondary combustion and gasification as fuel.
JOURNAL OF CLEANER PRODUCTION
(2021)
Review
Engineering, Environmental
Yang Xue, Xiaoming Liu
Summary: This review discusses the sources and characteristics of heavy metals and persistent organic pollutants in municipal solid waste incineration (MSWI) fly ash, as well as various treatment methods. It also proposes collaborative treatment methods for degrading dioxins and enriching heavy metals. These suggestions can provide directions for achieving completely harmless treatment of MSWI fly ash.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Construction & Building Technology
Xiaonan Ge, Xiang Hu, Caijun Shi
Summary: Circulating fluidized bed fly ash (CFA) and red mud (RM)-based geopolymers were characterized in terms of setting time, mechanical properties, microstructure, chemical and mineral compositions. The effects of curing duration, curing temperature, and RM/CFA mass ratio were considered. The study found that longer curing time and higher curing temperature increase strength, while a lower RM/CFA ratio causes a reduction in mechanical properties. The results show a strong correlation between strength, porosity, and amorphous phase content. Under ambient curing conditions, an RM/CFA ratio of 39% is identified as the critical upper limit for producing geopolymers with desired mechanical properties and microstructure.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Wei Zhang, Xiaoming Liu, Zengqi Zhang, Yantian Li, Jiarui Gu, Yaguang Wang, Yang Xue
Summary: This study aims to increase the utilization ratio of circulating fluidized bed fly ash (CFA) in cementitious materials and reduce environmental pollution. By increasing the proportion of CFA and reducing the cement clinker content in CFA-based cementitious materials, good performance development and low concentrations of heavy metal leaching can be achieved.
CONSTRUCTION AND BUILDING MATERIALS
(2022)