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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。
The influencing factors of dissolved air flotation degreasing and the mechanism of action of each factor were studied through experimental methods. Increasing the dissolved gas pressure can increase the number density of bubbles and the collision probability of bubble / oil droplet. The increase of number density is the main reason to improve the oil removal efficiency. Surfactants and flocculants can improve the flotation degreasing effect. Surfactants can reduce the bubble diameter and increase the collision efficiency of oil droplets / bubbles, and flocculants can make the oil droplets coalesce into clusters to improve the bubble capture efficiency. Finally by comparing the effectiveness of several chemical additives show that inorganic flocculant PAC compared to organic flocculant PAM and surfactant SLS is more suitable as dissolved air flotation chemical additives.