电镀污泥标准浸出方法的比对

采用3种固体废物浸出毒性标准浸出方法处理电镀污泥,考察浸提剂、样品粒径、液固比、振荡时间、振荡方式等因素对电镀污泥中重金属浸出效果的影响,用电感耦合等离子体原子发射光谱法同时测定浸出液中铜、锌、镍、铬、铅、镉、钡等元素。试验表明:醋酸缓冲溶液体系浸出液中重金属浓度最高;样品粒径越小,浸出毒性越大;翻转振荡比水平振荡更有利于重金属浸出;液固比增大,重金属浸出量增加;虽然液固比和振荡时间对重金属浸出效果均有影响,但很难确定最佳值。

Comparison of the Standard Leaching Methods of Electroplating Sludge

Cu,Zn,Ni,Cr,Pb,Cd and Ba in electroplating sludge were extracted by 3 standard methods of solid waste leaching, and determined by inductively coupled plasma atomic emission spectrometry. Extraction experiments on the leaching agents, diameter of sample particles, liquid solid ratio, oscillation time and form resulted that acetic acid buffer solution, smaller size of sample particles, flip oscillation and larger liquid solid ratio would produce more amount of heave metals in lixivium. Liquid solid ratio and oscillation time both had effect on heavy metal leaching, but it was difficult to achieve its optimum.