温度对气升回流一体化中试装置脱氮效果的影响

EFFECT OF TEMPERATURE ON THE DENITRIFICATION IN THE AIRLIFT-REFLUX COMBINED PILOT PLANT

针对传统分散式生活污水处理工艺经济性能较差、维护管理不便等缺点,开发了“气升回流一体化”工艺,通过收集曝气池余气实现混合液回流,仅需1台鼓风机即可正常运转,节省能耗;利用缺氧区实现反硝化脱氮以及污泥储存消解,可长期不排泥。通过对容积为10.41 m^3中试装置,以城市市政管网污水为水源,进行为期6个月的运行研究,考察温度对装置运行效果的影响。结果表明,温度在7.8-28.5℃,温度骤降对脱氮效果有较大影响,COD、NH4＋^-N、TN去除效果均下降,分别为70%、60%、50%左右,出水浊度5 NTU左右。温度逐渐稳定在13.5℃左右,COD、NH4＋^-N、TN去除率分别提升至90%、90%、60%左右,出水浊度5 NTU左右。反应器不排泥特性决定了装置具有较强的抗冲击负荷能力以及较好的低温硝化能力。

In order to solve the poor economic performance and inconvenient of maintenance and management of traditional decentralized sanitary sewage treatment process, the ＂airlifting-reflux combined＂ process was proposed. Because the process achieved mixed liquid reflux by collecting residual gas from aeration tank and could run normally with only one blower and it was energy-saving. Moreover, the anoxic zone was used to achieve de-nitrification and store digestion sludge, which didn＇t need to discharge sludge in a long period. Using domestic wastewater as experimental water resources, effect of temperature on the operation of the pilot plant of 10.41 m^3 was investigated in 6 months. The experimental results showed that when the temperature was between 7.8-28.5 ℃, the temperature plunge had a great impact on nitrogen removal and the removal efficiency of COD, NH4＋^-N and TN decreased to 70%, 60% and 50% respectively. The water turbidity was about 5 NTU. When the temperature gradually stabilized at about 13.5 ~C, COD, NH4^＋-N and TN removal rate increased to 90%, 90% and 60% and water turbidity was about 5 NTU. The reactor with no sludge discharge decided that the reactor had a strong ability of resistance to impact load and good nitrification at low temperature.