低C/N比生活污水对脱氮除磷影响对比试验研究

Research on Effect of Low C/N Ratio on Denitrification and Dephosphorization of Sewage

利用长春市南郊污水处理城市污水为对象，分别采用填料A／AgO和SBR反应器进行低C／N比条件下的脱氮除磷的试验研究。结果表明，相同水力停留时间下，填料A／AgO反应器和SBR反应器的脱氮除磷效果较好，建议水力停留时间为6h；污泥龄和C／N比对填料A／AgO反应器和SBR反应器的COD去除效果影响不大，各种条件下COD去除率在80％左右；推荐填料A／AgO反应器的最适SRT为15d，而SBR反应器的最适SRT为20d；SBR反应器更适合处理低温污水；C／N比值越大，填料A／AgO反应器和SBR反应器的TN去除率越高，最佳范围在4～6之间，其中填料AgA／O反应器的去除效果最好。

Using urban sewage from Changchun city sewage treatment plant as the object, packed A/A/O and SBR reactors were adopted to study denitrification and dephosphorization of sewage under low C/N ratio. The results show that, under the same hydraulic retention time, packed A/A/O reactor and SBR reactor all have better nitrogen and phosphorus removal rate, suitable hydraulic retention time is 6 h; sludge age and C / N ratio have little effect on COD removal rates of packed A/A/O reactor and SBR reactor; under a variety of conditions, COD removal rate is around 80%; the optimum SRT of packed A/A/O reactor is 15 d, while the optimum SRT of SBR is 20d; SBR reactor is more suitable to treat the low temperature sewage; the bigger the C/N ratio, the higher the TN removal rates of packed A/A/O reactor and SBR reactor, the best C/N ratio is in the range of 4 to 6, the removal rate of packed A/A/O reactor is the best under above conditions.