LSP&PNR工艺的脱氮除磷和污泥减量性能研究

Study on LSP&PNR Process for Nitrogen and Phosphorus Removal and Sludge Reduction

在工艺调控的基础上，发现限氧曝气、连续流A／O工艺在长污泥龄条件下融合外排厌氧富磷上清液的侧流除磷技术可以解决污泥减量工艺对氮、磷去除能力低的问题，以此为基础开发了具有脱氮除磷功能的污泥减量LSP＆PNR工艺。应用该工艺处理校园生活污水的试验结果表明，在SRT=50d、DO=0．5～1．5mg／L以及进水COD=332～420mg／L、NH，-N=30～40mg／L、TN=34～51mg／L、TP=6～9mg／L的条件下，出水COD≤23mg／L、NH3-N≤3．2mg／L、TN≤17mg／L、TP≤0．72mg／L；表观污泥产率为0．155gMLSS／gCOD。研究还发现，在LSP＆PNR工艺中同步硝化反硝化是最主要的脱氮形式，约占反硝化脱氮总量的60％；代谢BOD，的需氧量为1．38～1．57kgO2／kgBOD5；进入化学除磷池的侧流液量相当于处理水量的10％～15％。

Based on the process regulation and control, it is found that under the condition of long sludge age, limited aeration and continuous flow A/O process coupled with side stream phosphorus removal technology by draining out anaerobic phosphorus-bearing supernatant can improve nitrogen and phosphorus removal ability of sludge reduction process. Hence, LSP ＆ PNR process for nitrogen and phosphorus removal and sludge reduction was developed. Test results of the process treating campus wastewater show that under the condition of SRT = 50 d, DO = 0.5 mg/L to 1.5 mg/L, the influent COD =332 mg/L to 420 mg/L, NH3 - N =30 mg/L to 40 mg/L, TN =34 mg/L to 51 mg/L and TP = 6 mg/L to 9 mg/L, the effluent COD, NH3 - N, TN and TP are equal to or less than 23 mg/L, 3.2 mg/L, 17 mg/L and 0.72 mg/L respectively. The apparent sludge production rate is 0. 155 gMLSS/ gCOD. Simultaneous nitrification and denitrification （SND） in the process is the primary form of nitrogen removal, which accounts for 60% of the total nitrogen removal, and the oxygen required for metabolizing 1 kg BOD5 is 1.38 kg to 1.57 kg. The anaerobic phosphorus-bearing supernatant drained into phosphorous removal tank is only about 10% to 15% of the influent.