C/N比对反硝化除磷效果的影响

Effect of C/N ration on denitrifying dephosphatation

在厌氧 缺氧 (A2 )SBR反应器中考察了C N比对反硝化除磷效果的影响 .结果表明 :C N比对反硝化除磷系统的运行效果影响很大 ,控制C N比实际上就是控制了系统中反硝化菌和反硝化除磷菌 (DPB)这两类菌的优势生长 .要想获得理想的反硝化除磷效果 ,应尽可能使外碳源和硝酸盐不在同一时间内共存 ,否则需调整二者的比例才能获得氮、磷的完全去除 .本试验条件下 ,当MLSS约为 3g·L- 1 、SRT约为 14d ,若进水中耗氧有机物 (以COD计 )、NO- 3 N和可溶性P的质量比约为 2 5 0∶60∶8,系统的运行效果达最佳 ,去除N、P所需的耗氧有机物 (以COD计 )

The effect of C/N ratio on denitrifying dephosphatation in an anaerobic/anoxic sequencing batch reactor (A_2 SBR) was investigated. The results showed that C/N ratio had great effect on denitrifying dephosphatation. Therefore, rational C/N ratio could provide the optimum operating condition for the predominant growth of both denitrobacter and denitrifying phosphorus removal bacteria(DPB) in the system. To achieve complete denitrifying dephosphatation, the co-existence of exterior carbon source and nitrate should be avoided for the best. Otherwise, the ratio of carbon source and nitrate should be adjusted to achieve the complete nitrogen and phosphorus removal, which could result in more consumption of the required COD. Under the conditions that MLSS was about 3g·L^(-1) and SRT was around 14d in this study, the opitimum removal efficiency was obtained if the influent COD, NO^-_3-N and dissolved P were about 250, 60 and 8mg·L^(-1), respectively. And at this condition, a minimum amount of COD was required to remove both N and P simultaneously.