生物载体与曝气方式对氧化池氧转移特性的影响

对比研究了不同曝气量条件下,分别采用穿孔曝气和微孔曝气时,装填不同载体的接触氧化池的氧转移特性。结果表明,在试验范围内,各接触氧化池的氧总传质系数均随曝气量的增加而增大,但增加速度逐渐变缓。当曝气量为3.5 m3/h时,网格载体池的氧转移效率和动力效率达到最大值,分别为5.25%和3.22 kgO2/(kW.h),是竖管载体池和悬浮球载体池的1.14倍,是无载体池的1.22倍。当处理对象为生活污水时,接触氧化池内可采用微孔曝气+竖管(或悬浮球)载体;而当处理对象为高浓度有机废水时,可采用穿孔曝气+网格载体+悬浮球载体。

Effects of Bio-carrier and Aeration Modes on Oxygen Transfer Efficiency in Contact Oxidation Tank

The oxygen transfer efficiencies of contact oxidation tanks filled with different carriers and equipped with perforated aeration pipes or micro-pore aeration pipes were investigated at different aeration rates.The results showed that the overall oxygen mass transfer coefficient of contact oxidation tanks sharply increased then gradually increased with increasing aeration rate.When the aeration rate was 3.5 m3/h,the oxygen transfer efficiency and power efficiency of grid bio-carrier tank reached its maximum values of 5.25% and 3.22 kgO2/(kW·h),which was 1.14 times bigger than vertical pipe bio-carrier tank and suspended ball bio-carrier tank and 1.22 times bigger than no bio-carrier tank.Contact oxidation tank equipped with micro-pore aeration pipes and vertical pipe bio-carrier could be used for treating domestic wastewater,and that equipped with perforated aeration pipes,grid bio-carrier and suspended ball bio-carrier could be used for treating high concentration organic wastewater.