The effects of washing solvents on the properties of ceramsite and heavy metal immobilization via the cosintering of municipal solid waste incineration fly ash and Cr-containing waste glass

粉煤灰 城市固体废物 废物管理 浸出(土壤学) 磷酸 核化学 环境科学 化学 环境化学 有机化学 工程类 土壤科学 土壤水分
作者
Jianli Huang,Xu Chu,Zhifei Shu,Xinxin Ma,Yiying Jin
出处
期刊:Journal of environmental chemical engineering [Elsevier BV]
卷期号:11 (1): 109089-109089 被引量:19
标识
DOI:10.1016/j.jece.2022.109089
摘要

Various washing solvents are being extensively researched to remove chlorides from municipal solid waste incineration fly ash (FA) and they have significant impacts on the recycling and reutilization of FA. The cosintering of FA and waste glass (WG) containing chromium (Cr) was explored in this study, as well as the effects of washing solutions (water [W-FA], phosphoric acid [P-FA], and sodium carbonate [Na-FA]) on the treated FA compositions, ceramsite characteristics, and heavy metals speciation. The findings demonstrated that washing process increased calcium oxide (CaO) content while reducing soluble salt level. The particle strength increased from 290.50 N to 926.78 N at 800–1050 °C, while increased from 228.68 N to 820.23 N when WG increased from 20% to 60%. Raw-FA ceramsite had a lower sintering temperature than treated FA ceramsite due to the higher particle strength and lower water absorption rate. At 1000 °C, the acid-soluble fraction of Cr of Na-FA and P-FA ceramsite was 64.72% and 9.07%, showing a promoted and inhibited effect on Cr leaching, respectively. The ecological risk index for P-FA and Na-FA ceramsite, both of which were produced at 1100 °C, were 30.61 and 46.68, respectively, indicating low environmental risk. Wollastonite was the dominating mineral phase in W-FA and Na-FA ceramsite, whereas chlorapatite and halite predominated in P-FA and Raw-FA ceramsite. Chlorine in P-FA ceramsite was combined with phosphates and calcium to generate stable minerals. Washing pretreatment reduced the environmental risk of ceramsite, and introduction of phosphorus could enhance heavy metal immobilization.
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