摘要
以大连市MSWI飞灰为研究对象,对MSWI飞灰理化特性、重金属种类、全量分析、重金属污染毒性、酸中和能力和化学赋存形态等展开系统研究,并分别研究浸取环境pH值、浸取周期、浸取环境温度以及震荡方式等因素对MSWI飞灰重金属浸出行为的影响.结果表明,MSWI飞灰主要由含钙矿物相(氢氧化钙和Ca ClOH等)和含氯矿物相(氯化钠和氯化钾等)组成.MSWI飞灰中重金属种类复杂且污染特性显著,Zn和Pb总含量均超过1000mg/kg. Cd、Pb和Zn浸出毒性分别超出国家要求9.7、7.1和0.7倍.本研究为MSWI飞灰的安全处置与资源化利用提供了依据.
Taking MSWI fly ash in Dalian as the research object,the physical,chemical properties and acid neutralization ability of municipal solid waste incineration(MSWI)fly ash,species,total amounts,pollution toxicity and chemical speciation of of heavy metal in MSWI fly ash were studied systematically in this work.And the influence of pH value of the leaching environment,leaching time,leaching temperature and oscillation modes on leaching behaviors of heavy metals in MSWI fly ash was also investigated.The results showed that MSWI fly ash was mainly composed of calcium containing mineral phases(calcium hydroxide and CaClOH,etc.)and chlorine containing mineral phases(sodium chloride and potassium chloride,etc.).The species of heavy metals in MSWI fly ash are complex and it is characteristic of significant pollution toxicity.The total amounts of Zn and Pb are more than 1000mg/kg.The leaching toxicity of Cd,Pb and Zn exceeds the requirements of"Hazardous Waste Landfill Pollution Control Standard"(GB18598-2019)by 9.7,7.1and 0.7times,respectively.In general,the leaching toxicity,migration and diffusion characteristics of heavy metals in MSWI fly ash have no significant mathematical correlation with their total amounts.This study could provide a solid theoretical basis for the safe disposal and resource utilization of MSWI fly ash.
作者
范程程
王宝民
王晓军
FAN Cheng-cheng;WANG Bao-min;WANG Xiao-Jun(Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《中国环境科学》
CSCD
北大核心
2023年第S1期149-159,共11页
China Environmental Science
基金
国家自然科学基金联合基金资助项目(U20A20324)
2020年度大连市科技创新基金项目(2020JJ26SN060)
关键词
垃圾焚烧飞灰
重金属
污染毒性
化学赋存形态
浸出行为
municipal solid waste incineration fly ash
heavy metal
pollution toxicity
chemical speciation
leaching behavior
