Experimental study on the washing characteristics of fly ash from municipal solid waste incineration

The disposal of fly ash with high salt content has become an important bottleneck for the further application of municipal solid waste incineration (MSWI). In this study, the soluble salt content and composition of fly ash from different MSWI were analysed. The composition of fly ash was affected by...

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Published in:Waste management & research 2022-08, Vol.40 (8), p.1212-1219
Main Authors: Yan, Mi, Jiang, Jiahao, Zheng, Rendong, Yu, Caimeng, Zhou, Zhihao, Hantoko, Dwi
Format: Article
Language:English
Subjects:
Calcium chloride
Chlorine
Combustion
Composition
Cost analysis
Energy costs
Evaporation
Flue gas
Fly ash
Incineration
Incinerators
Municipal solid waste
Municipal waste management
Salts
Solid waste management
Solid wastes
Variance analysis
Washing
Waste disposal
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Summary:The disposal of fly ash with high salt content has become an important bottleneck for the further application of municipal solid waste incineration (MSWI). In this study, the soluble salt content and composition of fly ash from different MSWI were analysed. The composition of fly ash was affected by incinerator type and flue gas cleaning system, especially the type of deacidification solvent. The soluble salt content in fly ash from MSW grate incinerator can be over 35.16%. Most of the soluble salt was calcium salt and chloride salt. The effect of washing parameters including liquid/solid (L/S) ratio and washing time on salt removal from fly ash were studied. Raw fly ash contained high chlorine (Cl) with the maximum of 19.83% and it can be significantly reduced by washing. Double-washing and secondary-washing had better performance than single-washing on salt removal. The secondary-washing did not only save water, but also reduced the energy cost during evaporation for crystallising soluble salt. Based on the analysis of variance (ANOVA), L/S ratio was the most principal factor for salt and Cl removal of fly ash by washing.
ISSN:0734-242X
1096-3669
DOI:10.1177/0734242X211068253