用凹凸棒石处理高浓含油废水的研究

研究了凹凸棒石吸附剂(包括其回收再生品)对废水中各种状态油的去除,结果表明,1％凹凸棒石原土与1mg/LPAM组合,可使含油约500mg/L的废水获得90%以上的除油率;若组合使用2.00%凹凸棒石和800mg/L硫酸铝,则易使含油126000mg/L的废乳化液破乳除油,除油率均达98％左右,COD_(Cr)去除率89％:如采用多级连续处理,则可有效地净化水质;油的去除效果是凹凸棒石投加量或初始油浓度的幂函数,且在剩余油量与投加量之间符合Freundlich吸附等温式:整个吸附过程具有不同特征的几个阶段,并随着时间的推延,逐渐呈现一级反应动力学的特征。

Removal of Wastewater Containing Concentrated Oil by Attapulgite

The removal of mineral oil under various states from wastewater by attapulgite adsorbents has been studied. It was found that over 90% removal rate of the floating or coarse dispersed oil could be achieved by using 1% raw attapulgite and 1mg/l PAM, while the initial oil concentration was about 500mg/l. The mixture of 2.00% attapulgite and 800mg/l aluminium sulfate was favourable for demulsification, and the removal rate of oil whose concentration was 126000mg/l, was about 98%, and of CODCr was 89%, and then the wastewater containing emulsified oil could be clarified effectively with multi-stage successive process. The efficiency of oil removal was the power function of attapulgite amount added or the initial oil concentration, and the relationship between the amount added and the remaining concentration corresponding to the Freundlich adsorption equation, and after a lapse of time, the adsorption process could be characterized by the first order kinetics.