不同电子受体生物除磷系统的运行效能对比  

COMPARISON OF BIOLOGICAL PHOSPHORUS REMOVAL BETWEEN DIFFERENT SYSTEMS USING O_2 AND NO_3^- AS ELECTRON ACCEPTOR

作　　者：李亚静[1] 孙力平[1] 

机构地区：[1]天津城市建设学院环境与市政工程学院天津市水质科学与技术重点实验室,天津300384

出　　处：《环境工程》2013年第5期44-49,共6页Environmental Engineering

基　　金：天津市水质科学与技术重点实验室开放研究基金资助项目(TJKLAST-2011-14)

摘　　要：通过平行运行2个分别以O2、NO-3为电子受体的SBR除磷系统,探讨了反硝化除磷区别于好氧除磷的工艺特征、菌群特征和污泥产率系数。通过批次试验分别考察了SBR o(厌氧/好氧)污泥和SBR n5(厌氧/缺氧)污泥吸磷特性。根据所用电子受体的不同,P O、P N、P Nn、P ON、P ONn等不同PAO被两个SBR系统筛选和富集;各系统根据自身电子受体不同而生长专一性强的PAO种类,其中P ON和P ONn等兼性PAO是SBR o系统中生物除磷的主体,P N、P Nn是SBR n5系统中生物除磷的主体;系统中兼性PAO比例越高、PAO种类越丰富,越利于除磷系统的稳定,除磷容量也越高;实验结果表明,在不同的电子受体(O2、NO-3)条件下,真实产率Y H具有显著的不同,SBR o和SBR n5的Y H分别是0.61,0.52 mg/mg,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。不过其表观产率Yobs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。By parallel operation of two phosphorus removal systems（SBR） using different electron acceptors of O2,NO3-,process characteristics and bacterial community structure and sludge yield were discussed.Being the efficient electron acceptor,NO3- or O2 supplying SBR removed phosphorus smoothly and comparatively.The phosphorus uptake of anaerobicoxic（A / O） sludge and anaerobic-anoxic（A / A） sludge were investigated via batch tests,P O,P N,P Nn,P ON and P ONn were selected and enriched in two SBR systems;strong specificity PAO types grow in each system based on the abilities of utilizing different electron acceptors.Facultative PAO of P ON and P ONn were found as the main contributors for the phosphorus removal and P N 、P Nn were found as the main contributors for the denitrifying phosphorus removal.The higher ratio they accounted in sludge,the more capacity the system possessed to remove phosphorus;The results showed that there was significant difference of real Y H at different condition for electron accepter of O2 and NO3-.And it was 0.61 and 0.52 mg / mg for SBR o and SBR n5 respectively.This was because different electrons needed different microbial population,which had different cell yield.But there was no significant difference for observed yield Y obs in SBR o and SBR n5,because the endogenesis respiration of aerobic sludge was stronger consequently more sludge being attenuated.

关 键 词：生物除磷 电子受体 聚磷菌 菌群特性 污泥产率 

分 类 号：X703[环境科学与工程—环境工程]