Impact of pressure and surfactant on oxygen mass transfer characteristics under cycle aeration
WANG Ying1,LEI Hongjun2,HU Xingji1,ZHANG Zhenhua1*
1. School of Resources and Environmental Engineering, Ludong University, Yantai, Shandong 264025, China; 2. School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China
The effects of the working pressure(0.05, 0.10 and 0.15 MPa)and the surfactant twelve alkyl sulfate(SDS; 0, 5, 10 and 15 mg/L)on the mass transfer coefficient of dissolved oxygen and oxygen in the process of cyclic aeration were studied by using the water and gas coupled automatic irrigation equipment. The results showed that in the cycle aeration, the saturation dissolved oxygen increased by more than 36%(P<0.05)with the increase of working pressure, and the addition of active agent significantly increased the saturation dissolved oxygen(P<0.05), and the maximum value of the lifting was 22.82% compared with the water condition. The increase of the working pressure on the mass transfer coefficient of oxygen is more than 17%, and the increase of the concentration of active agent on the mass transfer coefficient of oxygen is above 52%. Considering the dissolved oxygen and oxygen mass transfer coefficient in aeration process, the working pressure of 0.15 MPa and the concentration of 5 mg/L activator are suitable aeration combination. The results can provide theoretical support for the optimization of aeration parameters.
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