Abstract:

In order to explore the coupling effect of two opposite wettability plate coalescence media, the hydrophilic and hydrophobic polypropylene materials were arranged alternately, the hydrophilic/hydrophobic composite structure coalescence device was constructed and the oil removal performance of coalescence was studied. The results showed that the coupling effect of hydrophilic/hydrophobic interface had coupling enhancement effect on oil removal efficiency. The removal efficiency of hydrophilic/hydrophobic bonding plates in vertical direction was about 4.4% higher than that of single hydrophilic bonding plates. The spatial structure of coalescing plates was an important factor affecting the coalescence efficiency. The stronger the shape of coalescing plates regularized the flow field, the more conducive to the oil-water two-phase separation. The aggregation behaviour of oil droplets on the upper and lower surfaces of oil-philic and oil-phobic plates was different. The process of oil-water agglomeration was mainly affected by the wettability of the lower surface of the coalescing plates. The upper surface of oil-philic and lower surface of oil-phobic plates were not conducive to the aggregation and separation of oil droplets. Hydraulic retention time and wettability of the coalescing material were important factors affecting whether small oil droplets can coalesce in the coalescing area. The above research results provided ideas and references for the treatment of oil-bearing wastewater with hydrophilic/oleophobic composite materials.

Key words: coalescence, oily wastewater, wettability, double interface coupling

摘要：

为了探究两种相反润湿性板式聚结材料的耦合作用，将水下亲油和水下疏油两种聚丙烯材料交替组合布置，构建亲/疏油复合结构聚结器，研究其聚结除油性能。结果表明，亲/疏油双界面耦合作用对除油效率具有耦合增强作用，亲/疏油聚结板垂直方向相间布置方式比单一亲油聚结板的去除效率提高约4.4%。聚结板的空间结构是影响聚结效率的重要因素，聚结板形状对流场的规整作用越强，越有利于油水两相分离。亲油板与疏油板上下表面油滴的聚结行为各不相同，油水聚结过程主要受聚结板下表面润湿性能影响，亲油板的上表面与疏油板的下表面并不利于油滴聚结。水力停留时间与聚结材料润湿性能是影响小油滴能否在聚结区完成聚结的重要因素。以上研究成果可以为亲/疏油组合材料处理含油废水提供思路和参考。

关键词: 聚结, 含油废水, 润湿性, 双界面耦合