城市污水处理厂出水总氮的强化调控

Enhanced Regulation and Control Technology of Total Nitrogen in a Municipal Sewage Treatment Plant

为实现污水处理厂出水总氮稳定达标排放,某城市污水处理厂在现有改良氧化沟工艺基础上,不改变现有建(构)筑物,提出一系列强化调控措施,主要包括进水投加碳源、增大回流比、提高生物池污泥浓度、合理控制生物池溶解氧、调整进水配比等。多种总氮强化调控技术的组合使用,使该厂出水总氮稳定降至10mg/L左右,取得了良好的处理效果。

In order to achieve the goal of stable discharge of total nitrogen from sewage treatment plant effluent,some suggestions were put forward on the basis of the existing improved oxidation ditch process in a municipal sewage treatment plant. Enhanced regulation and control technologies mainly included adding carbon source to influent,increasing reflux ratio,increasing sludge concentration in biological pond, reasonably controlling dissolved oxygen in biological pond, and adjusting influx proportion. The combined application of various enhanced control techniques of total nitrogen had resulted in a stable reduction of total nitrogen in effluent from the sewage treatment plant to about 10 mg/L,which achieved good treatment effect.