微纳米曝气氧传质影响因素分析及经验模型建立  

An Empirical Model for Oxygen Mass Transfer Rate and Its Influencing Factors in Micro-nanometer Aeration

作　　者：胡湛波[1,2] 陆晖[1] 刘恺华 吴慧玲[1] 王璀[1] 徐旻旸 

机构地区：[1]广西大学环境学院,广西南宁530004 [2]广西南方流域生态治理研究院,广西南宁530004

出　　处：《环境科学与技术》2016年第5期95-99,共5页Environmental Science & Technology

基　　金：国家科技重大专项水污染控制与治理专项(2009ZX07317-006-02);广西自然科学基金(2013GXNSFAA019278);南宁市科学研究与技术开发计划(20123112;20132303)

摘　　要：考察微纳米曝气装置在不同空气流量、温度条件下氧传质特性的变化,结果表明：空气流量在1~6 L/min范围内,微纳米曝气过程氧总体积传质系数（KLa）随着空气流量增大而增加,标准氧传质效率随着空气流量增加而减小。微纳米曝气的KLa与标准氧传质效率均高于鼓风微孔曝气。在温度20~35℃范围内,微纳米曝气的KLa与标准氧传质效率随着温度升高而增加,鼓风微孔曝气趋势与其相同。相对于温度而言,微纳米曝气KLa对于通气量变化更敏感。同时,文章还考察了水体污染水质条件对微纳米曝气中氧传质特性的影响。曝气组KLa随着pH增加先下降后上升,在pH在7左右达到最小。水中NH4Cl和浊度也会对曝气时的KLa产生影响,KLa分别随着NH4Cl增大而下降,随着浊度的增大而增大。该研究还建立了溶解氧、不同影响因素和时间之间的经验模型,为微纳米曝气对污染水体曝气过程中条件选择提供了定量依据。Using the micro-nanometer aeration equipment to find out the influence of operation condition and water quality of landscape water on oxygen transfer quality in micro-nanometer aeration, it was found that volumetric oxygen transfer coefficient（KLa） is in positive correlation with air flow, at the same time, negative correlation with standard oxygen transfer efficiency（SOTE） in air flow condition of 1~6 L/min. KLaof micro-nanometer aeration and SOTE are both higher than oxygen jet aeration. Standard oxygen transfer efficiency and KLaof micro-nanometer aeration are in positive correlation with temperature in temperature condition of 20 ~35 ℃, and the same tendency of oxygen jet aeration. Standard oxygen transfer efficiency and KLaof micro-nanometer aeration are more susceptible to air flow than temperature. KLaof micro-nanometer aeration first rises then falling with the increase of pH, to reach the top value around pH 7. KLais influenced by NH_4Cl and turbidity of water, that is a positive correlation with turbidity, and a negative correlation with NH_4Cl. Empirical model is established between dissolved oxygen, different influence factors and time, the model provides the basis for landscape water governance.

关 键 词：微纳米曝气 氧传质速率 通气量 经验模型 

分 类 号：X703.1[环境科学与工程—环境工程]