微气泡曝气条件下仿生水草生物接触氧化池对污水的处理效果

Studies on the performance of bionic aquatic filler biological contact oxidation tank for wastewater treatment based on microbubble aeration

采用仿生水草作为生物接触氧化池填料,在微气泡曝气环境下处理模拟生活污水。结果表明,微气泡曝气下,稳定期生物接触氧化池对COD、氨氮、TN的平均去除率分别为86.1%、78.7%、69.8%,明显高于传统曝气(COD、氨氮、TN的平均去除率分别为76.2%、60.9%、54.1%)。仿生水草具有较强的生物富集能力,微气泡曝气下仿生水草表面挂膜生物量达16.45μg/g,生物活性达81.16μg/g,硝化细菌数量达2.8×10^(10)个/g,硝化菌群的平均相对丰度达29.7%。微气泡曝气可以提高氧传质效率,仿生水草表面富集的高浓度硝化细菌可以强化硝化反硝化过程,两者均有助于提升生物接触氧化池的出水水质。

The bionic aquatic filler was adopted as filler of biological contact oxidation tank to treat the simulated domestic sewage under the microbubble aeration environment.The results showed that under the microbubble aeration,the average removal rates of COD,ammonia nitrogen and TN were 86.1%,78.7%and 69.8%respectively during the stable period of biological contact oxidation tank,which was significantly higher than conventional aeration(the average removal rates of COD,ammonia nitrogen and TN were 76.2%,60.9%and 54.1%respectively).Bionic aquatic filler posed better effect on bioaccumulation.The biomass on the surface of bionic aquatic filler reached 16.45μg/g,the biological activity was 81.16μg/g,the number of nitrifying bacteria was 2.8×10 10 cells/g,and the average relative abundance of the group was 29.7%under the microbubble aeration.Microbubble aeration could improve the efficiency of oxygen transfer,and the high concentrations of nitrifying bacteria enriched on the surface of bionic aquatic filler could strengthen the process of nitrification and denitrification.Both of the two factors could improve the effluent quality of biological contact oxidation tank.