工业园区污水处理厂低负荷条件下A/O脱氮工艺的优化

Optimization Operation of Nitrogen Removal Process A/O under Low Pollutant Load Condition in an Industrial Park Wastewater Treatment Plant

某工业园区污水处理厂生物处理系统采用A/O工艺,其进水单一,工业废水碳源严重不足,总氮去除效果差。通过在生产运行中不断摸索,调整运行模式,投加葡萄糖作为碳源,调整内回流比,确保缺氧区的DO在0.5 mg/L以下。采取以上强化措施后,出水总氮稳定达标,出水水质达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。

The biological treatment process of an industrial park wastewater treatment plant was A/ O process. The influent of the plant was composed by one kind of wastewater. Since the insufficient organic carbon source in the raw wastewater led to the poor performance of total nitrogen removal. Through continuous exploration in operation, some methods were taken as follows： adding glucose as the carbon source, adjusting the internal reflux ratio and controlling the anoxic zone DO below 0.5 mg/L by adjusting the operation mode. After the enhance treatment method was applied, the total nitrogen of effluent was stable and reached the first level class A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant（ GB 18918 -2002） together with other indexes in the effluent.