Experiment investigation of airlift contact oxidation process performance for domestic wastewater treating

Integrated biological wastewater reactor by a combination of air-lift device and cellular filler reactor was utilized to treat sewage on campus. The experimental results suggest that by vaccinating with an indirect and fast way, COD in effluent water could achieve 32mg/L after 7 days with the removal rates of 63.6%, representing the start-up of reactor. When the air-to-liquid ratio was 16.8:1, the hydraulic load of filler was 4.8m³ / (m³·d), the optimized operation could be achieved and the average COD and NH₃-N removal rates were 80.1% and 58%. The average COD removal increased from 81% to 93.1% with the increasing of influent COD load from 130mg/L increased to 500-600 mg/L. When the filer completely submerged in water, the system still had good resistance to impact load even if the system was influenced by external shocks.