低温条件下微孔曝气氧化沟中试装置的调试及启动

采用微孔曝气氧化沟中试装置处理实际污水处理厂沉砂池出水,研究了中试装置在低温条件下实现启动的可行性和可靠性。结果表明,中试装置抗冲击负荷能力较强,在低温条件下(13~18℃),控制好氧区DO浓度为0. 5~1. 0 mg/L,系统运行稳定;试验后期,中试装置出水指标除TP外其余均满足《城镇污水处理厂污染物排放标准》一级A标准要求。因此,在低温条件下中试装置可通过降低系统曝气量实现启动。分析了除磷效果不佳的原因,主要与排泥不规律、接种污泥除磷能力较差、回流污泥中含有硝态氮等有关。

Commissioning and Start-up of Pilot-scale Microporous Oxidation Ditch at Low Temperature

A pilot-scale microporous aeration oxidation ditch was applied to treat the effluent from a grit chamber of a wastewater treatment plant,and the feasibility and reliability of starting up the pilot plant at low temperature were investigated.The pilot plant had strong shock load resistance,and the system operated stably at low temperatures between 13℃to 18℃when maintaining dissolved oxygen concentration between 0.5 mg/L and 1.0 mg/L.Except TP,the effluent quality of the pilot plant reached the first level A criteria of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant during the late period of the test.The pilot plant could be started up by reducing the aeration rate at low temperature.The reason for poor phosphorus removal was mainly related to irregular sludge discharge,poor phosphorus removal capacity of inoculated sludge and nitrate in the reflux sludge.