Oil-water separation process based on microbubble air flotation membrane device and scale-up research
Yuning Liang, Baohui Wang, Ying Chen, Zixuan Yan, Hongbao Liang, Xiaoyu Wang, Hongtao Chen
Abstract
The treatment of oily wastewater is of great significance to oilfield production and ecological environment protection. A microbubble air flotation membrane device integrating air flotation separation and membrane separation is proposed, and a purely physical process of wastewater treatment is designed, which has significant advantages in the treatment of oily wastewater, especially in the treatment of polymer-driven oily wastewater. In this paper, we studied the oil-water separation mechanism and the removal effect of suspended solids of the microbubble air flotation membrane device, examined the handling capacity, reflux ratio, dissolved air water gas-liquid ratio on the oil removal rate, and determined the optimal parameters of the process for the handling volume of 7.8m3/h, reflux ratio of 15.57%, dissolved air water gas-liquid ratio of 1:10. The oily wastewater is discharged from the device and filtered by special quartz sand can be achieved with the oil content and suspended solids content were below 20 mg/L, and the oil removal rate was over 95%, which reached the reinjection standard. This study can help the treatment and utilization of oilfield wastewater, and realize the water resources, energy, energy saving, and emission reduction.