污泥回流比对厌氧/好氧工艺除磷效果影响的研究

Effect of recycle ratio on phosphorus removal of anaerobic/aerobic process

以长距离输送的合流制污水为进水,考察不同污泥回流比下厌氧/好氧(A/O)工艺对COD、N、P的去除效果,深入研究污泥回流比对生物除P代谢过程的影响。结果表明,污泥回流比对COD及NH4+-N的去除没有明显影响,但对TN、TP、PO43--P的去除影响较大。随着污泥回流比的增大,聚磷菌(PAO)的厌氧释P量逐渐减小,P的去除率逐渐降低。减小污泥回流比,可延长A/O工艺厌氧池实际HRT,增加PAO在厌氧池可有效利用的碳源,使PAO在厌氧池充分释P,从而提高除P效率。

Series of experiments were conducted to determine the effects of recycle ratio on the anaerobic/aerobic （A/O） system performance （removal of COD,N and P） in treating the combined wastewater which was pipeline transported over a long distance. The effect on the metabolic process responsible for the biological phosphorus removal was also studied. Based on long-term treatment results,the recycle ratio affected the removal of total nitrogen and phosphorus but not the removal of COD and ammonia nitrogen. The anaerobic phosphorus release of phosphorus-accumulating organism （PAO） and the phosphorus removal rate both decreased at a higher recycle rate. Reducing the recycle ratio can prolong the actual hydraulic retention time and increase the carbon source available for PAO to release phosphorus in the anaerobic zone and thus enhance the rates of phosphorus release and removal.