中试规模微气泡曝气生物膜反应器运行性能评估

运行中试规模微气泡曝气生物膜反应器处理校园生活污水,对其运行性能进行评估,并与传统生物处理工艺比较.结果表明,采用中试系统处理校园生活污水原水时,平均COD去除率和去除负荷分别为57.0%和2.68 kg·(m~3·d)~(-1),平均氨氮去除率和去除负荷分别为17.4%和0.17 kg·(m~3·d)~(-1),平均TN去除率和去除负荷分别为15.8%和0.21 kg·(m~3·d)~(-1),平均氧利用率达到100%.采用中试系统处理可生化性较差的生物接触氧化池出水,平均COD去除率和去除负荷分别为46.0%和1.53 kg·(m~3·d)~(-1);平均氨氮去除率和去除负荷分别为17.1%和0.32 kg·(m~3·d)~(-1);平均TN去除率和去除负荷分别为14.1%和0.28 kg·(m~3·d)~(-1);平均氧利用率高于50%.由于微气泡曝气能够加速氧传质过程并提高氧利用率,因此相同进水条件下,中试系统污染物去除能力显著优于传统生物接触氧化工艺和传统曝气生物滤池工艺.

Performance Evaluation of a Pilot-scale Microbubble-aerated Biofilm Reactor

A pilot-scale microbubble-aerated biofilm reactor was operated to treat campus domestic wastewater and its performance was evaluated and compared with conventional biological treatment processes. The results indicated that when the raw campus domestic wastewater was treated in the pilot system, the average COD removal efficiency and loading rate removed were 57.0% and 2.68 kg·(m³·d)^-1; the average ammonia nitrogen removal efficiency and loading rate removed were 17.4% and 0.17 kg·(m³·d)^-1; the average total nitrogen (TN) removal efficiency and loading rate removed were 15.8% and 0.21 kg·(m³·d)^-1; and the average oxygen utilization efficiency reached 100%. When the effluent of biological contact oxidation tank with poor biodegradability was treated in the pilot system, the average COD removal efficiency and loading rate removed were 46.0% and 1.53 kg·(m³·d)^-1; the average ammonia nitrogen removal efficiency and loading rate removed were 17.1% and 0.32 kg·(m³·d)^-1; the average total nitrogen (TN) removal efficiency and loading rate removed were 14.1% and 0.28 kg·(m³·d)^-1; and the average oxygen utilization efficiency was higher than 50%. Furthermore, the contaminant removal performance of the pilot system was much more efficient than conventional biological contact oxidation tank and biological aeration filter tank with the same influent quality, since oxygen transfer and oxygen utilization could be enhanced by microbubble aeration.