摘要
微气泡气浮旋流技术是将气浮分离与旋流分离相结合的一种新型高效分离方法.利用微气泡气浮旋流技术进行油水分离,探究了溶气水微气泡、旋流场、絮凝剂3种因素对油水分离效果的影响,并用高速成像技术考察了微气泡与油滴、微气泡与絮体的结合过程.结果表明,溶气水微气泡可大幅缩短油水分离时间,相比纯水静置缩短了50%.在油水混合物初始质量浓度为400 mg/L时,气浮+旋流+絮凝剂组合工艺的最佳实验条件为油水混合物与溶气水的体积比1∶4、旋流速度370 r/min、复合絮凝剂(PAC∶CPAM)的复配比2∶1,此条件下污水最终含油质量浓度低于10 mg/L,满足《污水综合排放标准》(GB 8978-1996).静水条件下,微气泡-絮体结合体的平均投影面积约为微气泡-油滴结合体的6倍,投加絮凝剂有利于提升油水分离效果.交互实验证明,相比纯水静置处理,经微气泡气浮、气浮+旋流以及气浮+旋流+絮凝剂3种工艺处理后,污水含油率分别降低38.7%、71.4%、76.5%.就最终油水分离效果来说,3因素组合>溶气水微气泡+旋流场>溶气水微气泡.
Abstract
Microbubble air flotation cyclone technology is an innovative and efficient separation method combining flotation separation and cyclone separation.Using this technology for oil-water separation,the effects of dissolved gas water microbubbles,cyclone fields,and flocculants on separation efficiency were investigated.High-speed imaging technology was utilized to study the interaction between microbubbles and oil droplets,as well as between microbubbles and flocs.The results showed that dissolved gas water microbubbles significantly reduced oil-water separation time,cutting it by 50%compared to static settling in pure water.At an initial oil-water mixture concentration of 400 mg/L,the optimal experimental conditions for the combined flotation+cyclone+flocculant process were:Oil-water mixture to dissolved gas water volume ratio of 1∶4,cyclone velocity of 370 r/min,composite flocculant ratio(PAC∶CPAM)of 2∶1.Under these conditions,the final oil concentration in wastewater was less than 10 mg/L,meeting the requirements of the Integrated Wastewater Discharge Standard(GB 8978-1996).In static water conditions,the average projected area of microbubble-floc aggregates was approximately six times that of microbubble-oil droplet aggregates,indicating that the addition of flocculants was conducive for improving oil-water separation.Interaction experiments demonstrated that,compared to pure water static settling,oil content in wastewater decreased by 38.7%,71.4%,and 76.5%after treatment using mi-crobubble air flotation,flotation+cyclone,and flotation+cyclone+flocculants,respectively.The final oil-water separation effectiveness was in order of three-factor combination>dissolved gas water microbubbles+cyclone field>dissolved gas water microbubbles alone.
维普
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