Na2S稳定生化剩余污泥重金属的作用研究

摘要

Stabilizing heavy metals for sludge harmlessness is of great significance. The results of ICP and Tessier analysis of heavy metals in biochemical residual sludge of a certain refinery showed that the contents of Ni,Cu,Pb,Zn,Ba,Cr,Cd,Ag,As,and Hg are high,and these metals exist in five differ-ent forms;Na2S has a good stabilizing effect on these heavy metals from the unstable state into the steady state,so that the leaching concentration of heavy metals from the sludge reaches the reguirement of the national standard on solid waste.%重金属处于稳定态对污泥无害化意义重大.采用ICP 元素分析和Tseeier 形态分析等方法对某炼油厂生化剩余污泥重金属含量及形态进行研究,发现炼油厂生化剩余污泥中 Ni,Cu,Pb,Zn,Ba,Cr,Cd,Ag,As,Hg 等10种重金属含量较高,且以5种不同形态存在,Na2S对这10种重金属具有良好的稳定作用,可将不稳定态转变为稳定态,从而使污泥重金属浸出浓度达到国家一般固体废物标准要求.