污泥龄对LSP & PNR污泥减量新工艺运行效能的影响

通过研究分析污泥龄（SRT）对富磷污水除磷的LSP&PNR污泥减量新工艺运行效果的影响，结果发现，延长污泥龄有利于提高系统的厌氧释磷能力，但不影响其总的除磷率，同时磷的回收比例增大，当SRT=50 d时，磷回收率取得最大值70.4％；LSP&PNR系统污泥龄增加，还有利于污泥产率的降低。试验还发现，排富磷污水除磷的长污泥龄LSP&PNR系统的除磷效率与污泥产率之间不存在制约关系，即系统可以同时获得优异的污泥减量与生物除磷效果，当SRT=50 d时，每降解1 kg COD仅产生0.143 kg污泥，而除磷率达最高值928％；LSP&PNR系统中SRT、DO与SVI之间存在一定的相关性，在供氧充足（DO＝0.8～1.5 mg/L）条件下，SRT增加，SVI越高，但对于SRT为50 d的LSP&PNR系统，稳定运行时没有污泥膨胀之虞。

Influence of sludge retention time on advanced sludge reduction process-LSP&PNR

AbstractThe influence of sludge age on the advanced sludge reduction LSP&PNR process with removing phosphorous by discharging phosphorous accumulating sewage was studied. The results show that extending sludge retention time (SRT) can improve the capability of anaerobic phosphorous release, while total phosphorous removal rate is not influenced by SRT. Meanwhile, the longer the SRT is, the lower sludge production (Ys) is. It also demonstrates that LSP&PNR system, in which phosphorous removal effect is not restricted by sludge production and vice versa, can achieve outstanding sludge reduction and phosphorous removal effect simultaneously in the condition of long SRT, that is, when SRT is 50 d, Ys can reach 0.143 and phosphorous removal rate is up to the maximum 92.8%. Moreover, there are some correlations between SRT and SVI. Generally, when dissolved oxygen (DO) is sufficient (DO is higher than 0.8mg/L), the longer SRT is, the higher SVI. However, there is no need to worry about sludge bulking of LSP&PNR process with SRT being 50 d.