复合调理脱水污泥热解残渣中重金属形态分布  

Speciation Distribution of Heavy Metals in Pyrolysis Residue of Dewatered Sewage Sludge after Conditioned with the Composite Conditioners

作　　者：关若楠 时亚飞[1] 梁莎[1] 虞文波[1] 宋健[1] 徐新宇[1] 郦超 肖君[1] 陈烨[1] 胡久坤 何忠 喻文昊 叶楠[1] 吴旭[1] 胡敬平[1] 杨家宽[1] 

机构地区：[1]华中科技大学环境科学与工程学院,湖北武汉430074 [2]东江环保股份有限公司,广东深圳518057

出　　处：《环境科学与技术》2017年第3期74-78,共5页Environmental Science & Technology

基　　金：教育部科学技术研究项目(113046A);华中科技大学创新交叉重点团队资助项目(0118261077);煤燃烧国家重点实验室开放基金资助项目(FSKLCCA1604)

摘　　要：市政污泥热解可实现无害化与能源转化,而了解重金属在热解残渣中的形态分布显得尤为重要。该文以原泥(RS)、复合调理剂深度脱水泥饼(FS)为研究对象分别进行了不同温度(500、600、700、800和900℃)的热解实验,分析了污泥、热解残渣样品中Cu、Zn、Cr、Pb、Cd 5种重金属元素含量,并采用Tessier形态逐级提取法进一步研究了污泥、热解残渣样品中重金属形态分布规律。结果表明:污泥热解后,重金属在热解残渣中有不同程度的富集,原泥直接热解后Cu和Zn富集效果更明显,而FS中Cr、Pb和Cd富集作用更显著。热解残渣样品中各重金属元素(Cu、Zn、Cr、Pb、Cd)均比其在原泥中以更加稳定的形态存在。The harmless treatment and energy conversion of the sewage sludge can be implemented by pyrolysis,and the understanding of speciation distribution of the heavy metals in pyrolysis residue is particularly important. The pyrolysis experiments were conducted at different temperatures （500, 600, 700, 800 and 900 ℃）, and the contents of heavy metals in raw sludge（RS）and dewatered sludge cake（FS） were studied. The concentrations of Cu, Zn, Cr, Pb and Cd in the pyrolysis residue were determined and the speciation of heavy metals was analyzed following Tessier sequential extraction procedure. An enrichment effect of heavy metals was found during the pyrolysis process. An enrichment of Cu and Zn in the pyrolysis residue was found for the raw sludge and an enrichment of Cr, Pb and Cd was found for the FS. From the chemical state analysis of the pyrolysis residue, most of the heavy metals （Cu, Zn, Cr, Pb, Cd） were presented in a more chemical stable form than those from raw sludge.

关 键 词：污泥 热解 重金属 能源转化 重金属形态 

分 类 号：X705[环境科学与工程—环境工程]