中文摘要：

通过实验方法研究了溶气气浮除油的影响因素及各因素的作用机制。提高溶气压力可增大污水中的气泡数密度及气泡／油滴的碰撞概率，其中数密度增大是改善除油效果的主要原因。表面活性剂和絮凝剂均可改善浮选除油效果。表面活性剂可减小气泡直径并提高油滴／气泡的碰撞效率，而絮凝剂则可使油滴聚集成簇而提高气泡的捕获效率。最后通过对比几种化学助剂的效果表明，无机絮凝剂PAC相较有机絮凝剂PAM及表面活性剂SLS更适于作为溶气气浮的化学助剂。

英文摘要：

The influence factors and mechanisms of emulsified oil separation by dissolved air flotation was studied by experimental method. The bubble number density and collision efficiency of bubbles/oil droplets in wastewater would increase by improving dissolved gas pressure. The bubble number density increasing was the main reason for oil removal efficiency. Also surfactants and flocculants could improve the removal efficiency, surfactants could decrease the bubble diameter in DAF and increase the collision efficiency of bubble/oil droplet, while flocculants could make oil droplets to cluster which could capture micro bubbles more easily. At last, the effects of three chemicals were compared, the results demonstrated that poly aluminium chloride was more effective for DAF than poly acrylamide and sodium lauryl sulfate.