| O2、NO-3、NO-2为电子受体的生物除磷比较 |
| 摘要点击 2436 全文点击 1756 投稿时间：2008-03-03 修订日期：2008-05-16 |
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| 中文关键词 生物除磷 电子受体 聚磷菌 聚糖菌 计量学 |
| 英文关键词 biological phosphorus removal electron acceptor phosphorus accumulating organism(PAO) glycogen accumulating organism (GAO) stiochoimetry |
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| 中文摘要 |
| 通过平行运行3个分别以O2、NO-3、NO-2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及其内在微生物竞争机制.NO-2不会对经驯化后反硝化聚磷菌（DPAO）的缺氧吸磷产生直接抑制作用，但其作为反硝化除磷电子受体的效能远低于NO-3；具备利用NO-3而缺乏NO-2反硝化酶系的DPAO（DPAO5）流失及聚糖菌（GAO）增殖是根本原因.而NO-3是一种高效电子受体，其反硝化除磷效能与以O2为受体的好氧除磷系统相当，两者在除磷计量学和功能菌群构成上十分接近.作为聚磷菌（PAO）的竞争者，GAO在3个研究系统中均大量存在.基于对不同电子受体的利用能力，PAO包含PO、PN、Pn、PNn、PON、PONn等6个种类.PON和PONn等兼性PAO是生物除磷的主体，其在污泥中比例越高，系统的除磷负荷也越大，即SBRo＞SBRn5＞SBRn3. |
| 英文摘要 |
| By parallel operation of three phosphorus removal systems (SBR) using different electron acceptors of O2, NO-3 and NO-2, process characteristics and inherent competition mechanism of microorganisms were discussed. Although NO-2 had no direct inhibition on anoxic phosphorus uptake after the DPAO cultivation, system performance was still much lower than that with NO-3 as electron acceptor. And it ultimately resulted from the washout of the group of DPAO (DPAO5) that lacked the ability to denitrify NO-2 and the enhanced GAO growth in the system. Being the efficient electron acceptor, NO-3 or O2 supplying SBRs removed phosphorus smoothly and comparatively, in viewpoint of stiochoimetry and constitution of functional bacteria. In all three test systems, mass of GAO was present to exhaust limited organics with PAO population. Moreover, total PAO could be divided into 6 distinct groups, i.e., PO, PN, Pn, PNn, PON and PONn, based on the abilities of utilizing different electron acceptors. And facultative PAO of PON and PONn were found as the main contributors for the phosphorus removal． Ｔhe higher ratio they accounted in sludge, the more capacity the system possessed to remove phosphorus, i.e., SBRo＞SBRn5＞SBRn3. |
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