污泥特性研究及处置方法探讨

CHARACTERISTICS OF SLUDGE AND DISCUSSION ON TREATMENT METHODS

选取城市污泥和几种电镀污泥,研究其成分、组成、热特性以及所含不同重金属——Zn、Cr、Cd、Pb、Hg、Co、Ni、As在焚烧产物中的迁移规律。研究表明:城市污泥成分较接近黏土,热值也较高,可以替代黏土或者燃料入水泥窑;低温时污泥失重比较大,高温时失重趋于平缓;在焚烧灰渣中Zn和Ni属于容易富集的元素;Cr也容易残留在底灰中;Cu、As和Hg不易富集,易生成气态产物挥发到烟气中。最后根据污泥特性提出处置建议。

Municipal sludge and several electroplating sludges were selected,whose components,composition,thermal characteristic and the distribution of different heavy metals(Zn,Cr,Cd,Pb,Hg,Co,Ni and As)were studied.The results of experiment show that the components of municipal sludge are closed to clay's,so the clay may be replaced with municipal sewage sludge.They have high mass loss at lower temperature and the tend of weight loss is moderate at higher temperature;Zn,Ni and Cr are easy to remain in the bottom ash;Cu,As and Hg are difficult to enrichment,they are easy to volatilize.Treatment suggestion is given according to the characteristic of sludge at last.