Abstract:Oxygen transfer process from the air bubbles to the water was mainly analyzed in the aeration chamber of a hypolimnetic aerator, parameters characterizing the effectiveness of oxygen transfer were properly determined,a dynamical model of oxygen transfer for hypolimnetic aeration was developed based on the double-layer theory. The effectiveness of oxygenation was well predicted using the developed dynamical model of oxygen transfer for hypolimnetic aeration. Based on the predicted results using the dynamical model of oxygen transfer, when the air flowrate increased or the bubble diameter decreased, the oxygen transfer coefficient and the oxygen transfer rate increased. When the air flowrate and bubble diameter increased, the aeration efficiency decreased. Under fixed configuration conditions of a hypolimnetic aerator, decreasing the bubble diameter and increasing the water depth above the air diffusors would be helpful to improve the effectiveness of oxygenation in the aeration chamber of a hypolimnetic aerator, especially when the bubble diameter was of micrometer level. When the air flowrate increased to a critical value of 0.06m3/s, the effectiveness of oxygenation in the aeration chamber would become weaker. Judged from the influencing characteristic curves of air flowrate on the oxygen transfer rate, aeration efficiency and oxygen input of the aeration chamber per unit time, the optimized operational conditions of a hypolimnetic aerator can be determined.
孙昕, 刘凌炜, 段飞飞, 解岳. 曝气条件对等温层曝气器充氧性能的影响[J]. 中国环境科学, 2015, 35(9): 2690-2697.
SUN Xin, LIU Ling-Wei, DUAN Fei-Fei, JIE Yue. Effects of aeration conditions on the oxygenation performance of a hypolimnetic aerator. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(9): 2690-2697.