Study on Treatment of Oily Wastewater by Loop Flotation Column
YAN Chao-yu LIU Yan-sheng CAO Rui JIANG Jing-jing
State Key Laboratory of Heavy Oil, China University of Petroleum State Key Laboratory of Heavy Oil Processing, China University of Petroleum State Key Laboratory of Heavy Oil Processing, China University of Petroleum State Key Laboratory of Heavy Oil Processing, China University of Petroleum
Abstract： The effects of gas velocity, liquid flux, and packing installed in the upper gas-liquid separation region on recovery efficiency of oil were experimentally studied in a loop flotation column. The loop flotation column was composed of an outer cylinder with inner diameter 100 mm and height 932 mm, and a inner concentric draft tube with inner diameter 59 mm and height 780 mm. Air and diesel oily wastewater were used as the media in the experiments. The results show that the recovery efficiency of oil firstly increases and then decreases with increasing the gas velocity. However, the recovery efficiency always decreases with increasing the liquid flux. Compared with the conventional cylindrical flotation column, the loop flotation column can obviously enhance the recovery efficiency of oil. The optimal operation gas velocity and liquid flux determined by the experiments are 0.015~0.02 m/s and 20 L/H, respectively. The maximum recovery efficiency of oil can reach 57.3% under the condition of packing installed in the upper region of the flotation column. Based on the experimental data, an empirical model was established which considered the effects of bubble characteristics, liquid physical properties, gas and liquid flux, and oil droplet back-mixing on the removal efficiency of oil which agreed well with the experimental data.
严超宇 刘艳升 曹睿 蒋晶晶. 环流浮选塔用于含油污水处理的实验研究[J]. , 2010, 10(6): 1010-1114.
YAN Chao-yu LIU Yan-sheng CAO Rui JIANG Jing-jing. Study on Treatment of Oily Wastewater by Loop Flotation Column. , 2010, 10(6): 1010-1114.
2010, Vol. 10 
