水处理污泥中几种重金属的浸出变化研究

Study on the Leaching Change of Several Heavy Metals in Sludge from Water Treatment

以电子工业水处理污泥为实例,通过改变浸提剂种类及液固比研究了污泥样品中重金属元素的浸出变化规律。结果表明:以醋酸缓冲溶液为浸提剂时重金属的浸出率显著高于纯水及硫硝混酸浸提剂;由于吸附或共离子效应,不同液固比对浸出结果影响显著,较高液固比时浸出率增加明显。

Taking the case of the sludge from electronics industry water treatment, the variation of leaching rate of the heavy metals in sludge samples was studied by changing the type of extraction agent and the ratio of liquid to solid. Experimental result shows that the leaching rate of heavy metals was higher with acetic acid as leaching agent than that with water and sulfuric acid/nitric acid as leaching agent. In addition, liquid to solid ratio significantly affects the leaching of heavy metals. High liquid to solid ratio contributes more effectively to increasing the leaching of heavy metals due to the adsorption or common-ion effect.