微纳米气泡曝气技术在生活污水处理中的应用研究

Applied Research of Micro-nano-bubble Aeration Technology on Treatment of Domestic Sewage

微纳米气泡曝气作为一种新型的曝气技术,已被逐渐运用在水处理中。本文从实际出发,对比研究了微气泡曝气和底部曝气对生活污水的处理效果。实验结果表明,在相同的曝气强度下,微气泡曝气技术对污水中CODCr的降解效率要明显高于底部曝气,前者的去除率为90.8%,后者仅为86.4%。使用微气泡曝气时,SS的浓度在8 h内达到最低值,去除率为96.3%,而使用底部曝气时,污水中的SS在第12 h才达到最低值,去除率仅为89%。使用微气泡曝气时,污水中氨氮的浓度在14 h左右(底部曝气需20 h)基本达到最低值,去除率为82%,比同时间段使用底部曝气时水中氨氮的去除率要高约15%,低温时更要高出20%以上。此外,使用微气泡曝气对TN和TP的最大去除率分别比底部曝气高7.5%和6%。

As a new type of aeration technology, micro - nano - bubble aeration was gradually used in the water treatment. From the actual practice, a comparison study on treatment efficiency of domestic sewage between the micro - bubble aeration and the bottom aeration was carried out. The results showed that micro - bubble aeration technology could make higher degradation efficiency on CODc~ in sewage than the bottom aeration under the same gas flow. The removal rate of the former was 90. 8% , while the later was 86.4%. The concentration of SS could get the minimum in the 8 h when using the micro -bubble aeration and its removal rate was 96.3%, white the bottom aeration needed 12 h to reach the minimum and the removal rate was only 89%. With the micro - bubble aeration, NH3 - N concentration in sewage fundamentally got the minimum in 14 h （bottom aeration needed 20 h） , and its removal rate was 89% , which was 15% higher than that from the bottom aeration during the same period of time and more than 20% higher when the temperature was low. Additionally, the removal rates of TN and TP came from micro - bubble aeration were 7.5% and 6% higher than those from the bottom aeration.