混合滤料的润湿性及其过滤处理含油废水性能

为了探究两种润湿性相反的特殊润湿性滤料的耦合作用,将超疏水超亲油石英砂滤料和超亲水水下超疏油石英砂滤料均匀混合,研究了混合滤料的润湿性以及过滤除油性能.结果表明,两种滤料混合组成的固体表面润湿性不满足每种滤料润湿性的加权平均关系,更符合二次曲线关系,决定系数高达0.9992;交替润湿性对过滤除油效率具有耦合增强作用.混合滤料的疏水亲油性越强,其除油效率、归一化附着效率和渗透系数都越大,反之亦然.滤料粒径越小,归一化附着效率的变化斜率越大,而滤速和床深对归一化附着效率的变化斜率影响不明显.滤料的疏水性具有增阻的效应,流速的增加有助于增大滤层的渗透系数.以上研究成果可为特殊润湿性混合滤料过滤处理含油废水提供研究思路和参考.

Wettability of mixed filter media and its performance in filtering and treating oily wastewater

To investigate the coupling effect of two special wettability filter media with opposite wettability, the superhydrophobic and superhydrophilic quartz sand filter medium and the superhydrophilic and underwater superhydrophobic quartz sand filter medium were mixed, and the wettability and filtration performance for oil removal of the mixed filter media were studied. The results showed that the wettability of the solid surface composed of the two kinds of filter media did not satisfy the weighted average relationship with the wettability of each filter medium. It was more consistent with the relation of conic curve, and the determination coefficient is as high as 0.9992. The oil removal efficiency of filtration was coupled with the alternate wettability. The more hydrophobic and lipophilic the mixed filter media was, the greater the oil removal efficiency, normalized adhesion efficiency and permeability coefficient were, and vice versa. The smaller the particle size of filter material was, the greater the slope of the normalized adhesion efficiency was, while the effect of filter speed and bed depth on the slope of the normalized adhesion efficiency was not noticeable. The hydrophobicity of the filter material has the effect of increasing resistance; the increase of the filter rate increased the permeability coefficient of the filter layer. This work demonstrated the filtration of mixed filter media for oil removal and provided a new idea for filtration treatment of oily wastewater.