压力与表面活性剂对循环曝气氧传质特性的影响

Impact of pressure and surfactant on oxygen mass transfer characteristics under cycle aeration

利用水肥气耦合自动灌溉设备进行曝气,研究工作压力(0.05,0.10和0.15MPa)和表面活性剂十二烷基硫酸钠(SDS;0,5,10和15mg/L)2因素12个组合条件对循环曝气过程中溶解氧及氧传质系数的影响.结果表明:在循环曝气中,饱和溶解氧随着工作压力的提高显著提升36%以上(P<0.05);与清水条件相比,活性剂的添加显著提高了饱和溶解氧值(P<0.05),提升的最大值为22.82%.工作压力的升高对氧传质系数的提高均在17%以上,活性剂浓度的升高对氧传质系数的提高均在52%以上.综合曝气过程中溶解氧及氧传质系数,0.15MPa的工作压力和5mg/L的活性剂添加浓度是适宜的曝气组合.研究结果可为曝气参数的优化提供理论支持.

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 show that in the cycle aeration,the saturation dissolved oxygen increases by more than 36%(P<0.05)with the increase of working pressure,and the addition of active agent significantly increases the saturation dissolved oxygen(P<0.05),and the maximum value of the lifting is 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.