Article
Engineering, Environmental
M. Wolffers, U. Eggenberger, S. Schlumberger, S. Churakov
Summary: This study provides a detailed characterization of municipal solid waste incineration ashes along the flue gas path, focusing on heavy metal extractability. The results show that different types of ashes have varying chemical and mineralogical characteristics, with electrostatic precipitator ashes exhibiting better leachability.
Article
Chemistry, Physical
Tadeusz Czech
Summary: This study investigated the properties of iron and other metal particles in coal fly ash by analyzing their structure, composition, and phase using various instruments.
Article
Environmental Sciences
Enrique C. Peres, Matias Schadeck Netto, Evandro S. Mallmann, Luis F. O. Silva, Edson L. Foletto, Guilherme L. Dotto
Summary: Geopolymers were synthesized from fly and bottom ashes of a thermoelectrical power plant in Brazil, aiming to add value to waste materials. It was found that geopolymers produced by conventional methods had higher surface area and total pore volume, while ultrasound-assisted synthesis showed better adsorption potential in some cases. Both methods demonstrated good adsorption performance for heavy metals like Ag+, Cu2+, Co2+, and Ni2+, with removal percentages exceeding 90%.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
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
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
Construction & Building Technology
Jan Fort, Jiri Sal, Radek Sevcik, Magdalena Dolezelova, Martin Keppert, Milos Jerman, Martina Zaleska, Vojtech Stehel, Robert Cerny
Summary: The tightening of environmental standards in the EU presents a significant push towards the transition to a circular economy. However, the use of coal fly ash as partial cement replacement may face challenges in the future, leading to the consideration of biomass fly ash as a promising alternative.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Zixing Liu, Wanyu Fang, Zixiang Cai, Jia Zhang, Yang Yue, Guangren Qian
Summary: Policy has a significant influence on the contents and leaching characterizations of municipal solid waste incineration fly ash. The implementation of garbage-classification policy led to changes in the content of chloride and heavy metals. The presence of calcium chloride hydroxide (CaClOH) resulted in a decrease in heavy metal leaching concentrations and more stable chemical speciation. Therefore, adjustments in fly ash treatment technologies and running parameters are necessary after the implementation of the garbage-classification policy.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Multidisciplinary Sciences
Yao Tang, Jingshi Pan, Biqing Li, Suying Zhao, Liguo Zhang
Summary: The study investigated the residual and ecological risks of heavy metals in fly ash from co-combustion of municipal excess sludge (ES) and coal. It found that Cu, Zn, and Mn had higher concentrations in the fly ash and most heavy metals were concentrated in fine particles. Despite lower concentration, Cd accounted for the main fraction of ecological risk in the fly ash.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Maciej Malarski, Piotr Wichowski, Justyna Czajkowska
Summary: Composting enables the recycling of biodegradable waste and ensures its proper disposal. Adding fly ash can increase the concentration of fertilizing substances in the compost. Fly ash addition may also slow down the release of nutrients, providing longer-lasting fertilization for plants.
Article
Green & Sustainable Science & Technology
Chengcheng Fan, Baomin Wang, Hongmei Ai, Yi Qi, Ze Liu
Summary: The study found that using coal fly ash-based geopolymer for MSWI fly ash S/S treatment performed better than Portland cement, with higher compressive strength and higher immobilization rates for heavy metals.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Xinyuan Zhan, Li'ao Wang, Lei Wang, Jian Gong, Xiang Wang, Xue Song, Tengtun Xu
Summary: The study discussed the co-recycling of MSWI fly ash, electrolytic manganese residue, and other materials to produce lightweight ceramisites, determining the optimal mixture and sintering conditions. It also explored the volatilization rates and residual fractions of heavy metals in the ceramisites, providing a feasible method for producing green lightweight aggregates.
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
Green & Sustainable Science & Technology
Weihua Peng, Yingying Liu, Manli Lin, Yan Liu, Cheng Zhu, Linhua Sun, Herong Gui
Summary: The study found that heavy metal concentrations in leachates from coal fly ash and coal gangue were low, but still inhibited the survival and reproduction of Daphnia magna. The toxicity of the leachates to D. magna was influenced by the chemical composition of the leachates and the properties of the coal fly ash and coal gangue.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Xinyuan Zhan, Yan Wang, Li'ao Wang, Chenxuan Li, Xiaowei Xu, Rui Deng
Summary: Municipal solid waste incineration (MSWI) fly ash and electrolytic manganese residue were used to produce lightweight ceramisite by mixing with coal fly ash. The migration, transformation, and stabilization/solidification mechanism of heavy metals during the ceramisite formation process were investigated. Heavy metals in ceramisite pellets were concentrated and transported among solids below 710 degrees Celsius, and then released into the flue gas as chlorides above 710 degrees Celsius, particularly for Pb, Cd, and Cu. The generation of heavy metal chlorides depended on the presence of silicon oxide and aluminum oxide, resulting in a higher volatilization rate of copper compared to Mn, Zn, and Cr. Remaining heavy metals such as Cu, Zn, and Cr in the solid phase were prone to ion exchange, balance charge, and specific adsorption with calcium-bearing minerals in ceramisite at 1160 degrees Celsius based on mineral analysis and principle component analysis.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Energy & Fuels
Shuping Pan, Qi Yao, Wenxiang Cai, Yaqi Peng, Yuhao Luo, Zhizhen Wang, Caiping Jiang, Xiaodong Li, Shengyong Lu
Summary: This study collected 12 fly ash samples from 9 grate power plants in southeastern China and determined their PCDD/Fs and heavy metal concentrations, comparing them to previous data. The results showed that the PCDD/Fs concentration in fly ash ranged from 0.002-0.051 ngI-TEQ/g, with an average of 0.027 ngI-TEQ/g. The study also identified a strong correlation between toxicity and specific PCDDs. Additionally, the heavy metal Pb was found to pose a significant environmental risk.