Chelating agents on activation effect of heavy metals in sludge Mn and Zn
Plant extraction technology has become the most promising method for removing heavy metals from sludge. However, most available form content of heavy metals in sewage sludge is low, which seriously hinders the absorption of plants. In this paper, the four-step of BCR was used to study the effects of EDTA-Na2 and tartaric acid on the morphology of Mn and Zn and the change of their morphology. The results show that Mn and Zn in the raw sludge acid extractable content are relatively low. After EDTA-Na2 and tartaric acid were added, the heavy metal forms of Mn and Zn in the sludge were changed, the heavy metal Mn and Zn acid extractable content increased with the increasing concentration of the chelating agent and then tends to be stable. The concentration of chelating agent is significantly correlated with Mn and Zn.
heavy metal chelating agenteffective formthe activation of heavy metals
NETL
NSTL
万方数据
维普
