低碳氮比对P-SBR工艺运行效能影响探究

Affect of low carbon-nitrogen ratio on operation effect of P-SBR process

考察P-SBR工艺在低碳源且碳氮比为2.5下的运行情况,结果发现,系统碳源不足,存在硝化和反硝化失衡,且由于系统内的碱度有限,p H值大大降低,呈现弱酸性;系统的去除效率大大降低,NH3-N、TN、TP的去除率由碳氮比为3.9时的99.5%、61.5%、99.3%分别降为49.1%、31.8%、43.1%;在好氧末出现了NO2--N的积累。主反应器内微生物环境的弱酸性和好氧吸磷不足导致系统的含磷率降低,从7.16%(碳氮比为3.9)降低为2.80%。同时强化释磷池内糖原和周期糖原变化比较明显,池内初糖原及周期糖原变化由碳氮比为3.9时的13.0%、1.3%分别升高至31.0%、5.7%。

The operation effect of P-SBR process under low carbon source and 2.5 of carbon-nitrogen ratio were investigated, the results showed that, because of the imbalance between nitrification and denitrifieation caused by insufficient carbon source, and the deficient alkalinity of the system, the sewage pH value reduced greatly which showing faintly acid, and the pollutants removal efficiency of the system was decreased enormously. The removal rates of NH3-N, TN, and TP, once were 99.5%, 61.5% and 99.3% respectively when the carbon-ni- trogen ratio was 3.9, now reduced to 49.1%, 31.8% and 43.1% respectively; NO2-N accumulation was found in the end of aerobic stage. Caused by the faintly acid environment and deficient phosphorus uptake in the main reactor, the phosphorus content of the system decreased from 7.16% （carbon-nitrogen ratio was 3.9） to 2.80%. Besides, the content and cycle of glycogen in the enhance phosphorus tank changed obviously, which were increased from 13.0% and 1.3%（carbon-nitrogen ratio was 3.9） to 31.0% and 5.7% respectively.