The motion law of oil droplets and bubbles in air flotation-cyclone
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.
micro-bubblesair flotation-cyclone processoilfield produced wateroil-water separation
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维普
