中文摘要：

应用PNH工艺处理低碳氮比的氨氮废水，结合氨氮在线和pH值在线，实现在线监测和自动化控制，简化了废水处理的运行管理。工艺条件：维持好氧池DO浓度在3mg／L以上。运行初期调节好氧池的pH值在7．3～7．6，氨氮负荷控制在0．2kgN／（m3·d）左右，稳定运行期调节pH值在7．2-7．4，逐渐提高负荷。结果显示，PNH运行期间，氨氮负荷逐渐提高至0．501kgN／（m3·d），氨氮转化率在90％以上，出水中亚硝态氮浓度低，氨氮硝化完全，出水水质达到《城镇污水处理厂污染物排放标准》（GB18918-2002）中的一级B标准。

英文摘要：

The PNH process was used to treat ammonia nitrogen wastewater with a low C/N ratio. The online monitoring and automation control of ammonia nitrogen and pH values were established, and the operation management of wastewater treatment was simplified. Key control parameters were as fol- lows： the dissolved oxygen in aerobic tank was above 3 rag/L; the pH during the start-up period was be- tween 7.3 and 7.6 ; the ammonia nitrogen loading rate was 0.2 kgN/（ m3 · d） ; and the pH during the stable running period was between 7.2 and 7.4. The results showed that the ammonia nitrogen loading rate gradually increased to 0.501 kgN/（ m3 · d） during the PNH process, the ammonia nitrogen conver- sion rate was more than 90%, and there was a low concentration of nitrite nitrogen in the effluent. Am- monia nitrogen was nitrified completely in the PNH process, and the effluent met the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918 - 2002）.