利用MSWI飞灰构建新型填埋固化基质的研究  

Novel solidification/stabilization matrices for safe landfill by utilizing MSWI fly ash

作　　者：董世翔[1] 钱光人[1] 

机构地区：[1]上海大学环境与化工学院,上海200072

出　　处：《环境科学学报》2005年第8期1052-1057,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.20477024);上海市教委2003年科技发展基金项目~~

摘　　要：介绍了以MSWI飞灰为主要组分,利用富铝组分调控所构建的Friedelettringite为主导相的新型固化体系.考察了固化体系的抗压强度并用美国EPA毒性浸出实验(TCLP),评价固化材料中重金属的浸出特性,使用XRD、DTG分析了固化体系的微观矿物相,FTIR图谱对固化体系矿物相的有关基团振动谱带进行比较,通过重金属的化学形态分布了解重金属在其中的赋存状态.结果表明,新体系可以通过矿物相的晶体化合作用对Pb、Cd、Zn重金属进行有效束缚,实现稳定固化.这种新型固化体系可望用于MSWI飞灰与其它重金属类危险废物的填埋共处置.The possibilities of MSWI fly ash as major constituent of novel solidification/stabilization matrices for safe landfill have been explored by mixing MSWI fly ash with aluminum- silicon component to form Friedel and ettringite phases with high fixing capacities for heavy metals. The physical properties, heavy metalsfixing capacity, mineral phases and its vibration bands in the new matrices have been characterized by compressive strength, TCLP, XRD and DTG and FTIR respectively. The sequential extraction procedure was used to analyses the fractions of chemical speciation for Pb, Cd and Zn ions. The result indicates that new S/S matrices can incorporate Pb, Cd and Zn ions effectively by physical encapsulation and chemical fixation, and they exhibit a great potential in co-landfill treatment of MSWI fly ash with other heavy metals-bearing hazardous wastes.

关 键 词：城市垃圾焚烧飞灰 安全填埋 重金属 固化/稳定化 Friedel相 TCLP浸出 化学形态 

分 类 号：X705[环境科学与工程—环境工程]