(1.中国人民解放军理工大学工程兵工程学院,江苏南京 210007;2.河北科技大学环境科学与工程学院,河北石家庄 050018;3.天津科技大学海洋科学与工程学院,天津 300457)
(1.Engineering Institute of Engineering Corps, PLA University of Science and Technology, Nanjing Jiangsu 210007, China;2.College of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang Hebei 050018, China;3.College of Marine Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China)
Microbubble aeration is a new type of bubble aeration, and contaminants in waste water has great influence on oxygen transfer in microbubble aeration. The effects of different typical contaminants on oxygen transfer in microbubble aeration were investigated by using a gas-water circulation type microbubble generator, including surfactants, soybean oil, phenol and nitrobenzene as well as suspended solid (kaolin). The results indicate that different from traditional bubble aeration, microbubble aeration seems like milk-turbid due to very small bubble size. The soluble organic contaminants improve generation and stability of microbubbles, resulting in higher gas holdup and gas retention time. The range of oxygen transfer coefficient KLa is 7.44~11.56h-1, and the range of α-factors is 0.77~1.20in microbubble aeration with the typical contaminants under all test conditions, larger than those in traditional bubble aeration. The improvement of microbubble generation and stability in presence of the contaminants should be responsible for the reduction of negative effect of contaminants on oxygen transfer. The gas hold-up and contaminant type are the important influencing factors for oxygen transfer in microbubble aeration.
吕 越,刘 春,杨 枭,吴克宏.典型污染物对微气泡曝气中氧传质特性的影响[J].河北科技大学学报,2012,33(5):469-474复制