Variation of the fraction transformations and mobility of Cu and Zn in municipal sludge with pH

摘要

Based on the laboratory experiment, the variation of the fraction transformations and mobility of Cu and Zn in municipal sludge with pH were discussed in this study. The results show that pH has an important influence on the fraction transformations and mobility of Cu and Zn. The oxidizable fraction and residual fraction are the main ones of Cu in sludge solutions, While the percentage of acid soluble /exchangeable fraction and reducible fraction are not negligible to the fractions of Zn in sludge solutions. According to the fractions of Cu and Zn, the stability of Cu is high and the bioavailabilty is poor, but the mobility and bioavailabilty of Zn are all high. It is concluded that with pH level increased the mobility and bioavailabilty of Cu and Zn have dropped according to the experiment result that the fractions of Cu and Zn have been transferred to oxidizable fraction and residual fraction.