能源环境保护2025，Vol.39Issue(6)：84-94,11.DOI:10.20078/j.eep.20250209
熟石灰对城市生活垃圾焚烧飞灰中重金属固化的影响
Effects of Slaked Lime on Heavy Metal Stabilization in Municipal Solid Waste Incineration Fly Ash
摘要
Abstract
Fly ash from municipal solid waste incineration(MSWI)is a hazardous waste that contains various toxic heavy metals,posing significant environmental risks if not properly treated.The leaching of these heavy metals restricts the resource utilization of fly ash and threatens the environment.This study investigates the influence of the slaked lime pre-addition during flue gas purification on the subsequent chelation and solidification treatment of MSWI fly ash.It focuses on the impact of slaked lime dosage and purity on the stabilization efficiency of heavy metals.Additionally,the mechanism of heavy metal solidification is elucidated by analyzing the micro-structure,mineral composition,and the distribution of heavy metal speciation.The experimental results indicated that the optimal solidification efficiency for most heavy metals was achieved when the slaked lime dosage reached 8％;specifically,the solidification efficiencies of Zn,Se,and Cr(Ⅵ)were 97.6％,82.9％,and 53.3％,respectively.Moreover,the solidification efficiencies of Cu,Pb,Cd,and Ni reached 100％.The addition of slaked lime increased the leaching concentrations of Ba and As;however,these concentrations did not exceed the regulatory limts for landfill disposal.Notably,using high-purity slaked lime significantly reduced the leaching concentrations of heavy metals,highlighting the crucial role of lime purity in stabilization.Microstructural analysis revealed that the addition of slaked lime densified the internal structure of fly ash,promoting the solidification of heavy metals.Mineral composition analysis showed that the presence of alkaline substances enhanced heavy metal stabilization.Heavy metal speciation distribution analysis indicated that the distribution of heavy metals shifted to more stable forms,further demonstrating the benefits of slaked lime addition.This study emphasizes the importance of pre-addition of slaked lime during flue gas purification in enhancing the subsequent chelation and solidification treatment of MSWI fly ash.The findings provide valuable insights into optimizing lime dosage to improve heavy metal stabilization,contributing to more effective and sustainable waste management practices.关键词
城市生活垃圾/焚烧飞灰/重金属/固化/熟石灰Key words
Municipal solid waste/Incineration fly ash/Heavy metals/Solidification/Slaked lime分类
资源环境引用本文复制引用
朱玲霞,蔡建军,吴浩,钟日钢,陈思杨,刘红..熟石灰对城市生活垃圾焚烧飞灰中重金属固化的影响[J].能源环境保护,2025,39(6):84-94,11.基金项目
桂林市科技局资助项目(20210218-3) （20210218-3）
国家自然科学基金资助项目(52266011) （52266011）
中国博士后科学基金资助项目(2023M741516) （2023M741516）
