电子受体对污泥产率的影响

The Effect of Electron Accepter on Yield of Activated Sludge

本文通过2个SBR和30次分批实验研究了电子受体(O2、NO3-)对活性污泥产率系数(真实产率YH和表观产率Yobs)的影响。分批实验采用的基质是多种多样的,所选用的接种污泥是SBR长期培养出来的。实验结果表明,在不同的电子受体(O2、NO3-)条件下,真实产率YH具有显著的不同,缺氧YH是0.53 mgCOD/mgCOD,而好氧YH是0.68 mgCOD/mgCOD,这是由于不同电子受体需要不同的微生物种群,其细胞产率不同。不过缺、好氧的表观产率Yobs(0.33 g△MLVSS/g△COD和0.35 g△MLVSS/g△COD)的差异并不显著,这是由于好氧污泥的内源呼吸作用更强,有更多的污泥衰减。

The effects of electron accepter of O2 and NO3^- on the real YH and observed yield Yobs of activated sludge were studied through 30 batch tests in two SBR reactors in this paper.In the batch tests multiple sorts of substrate were used and the inoculated sludge was cultivated in SBR reactor for long period.The results showed that there was significant difference of real YH at different condition for electron accepter of O2 and NO3^-.It was 0.53 and 0.68 mg COD/mg COD for anaerobic and aerobic condition,respectively.This was because different electrons needed different microbial population,which had different cell yield.But there was no significant difference for observed yield Yobs（0.33 and 0.35 g △MLVSS/g △COD respectively）at both anaerobic and aerobic conditions,because the endogenesis respiration of aerobic sludge was stronger consequently more sludge being attenuated.