Abstract:

In order to study the characterization of polyphosphate-accumulating organisms (PAOs) community structure in an enhanced biological phosphorus removal system, the phosphorus uptake of anaerobic-oxic (A/O) sludge and anaerobic-anoxic (A/A)sludge were investigated via batch tests.The experiment results indicated that the A/O sludge had a higher aerobic phosphorus uptake rate than the anoxic phosphorus uptake rate, however, the aerobic phosphorus uptake rate of the A/A sludge was less than the anoxic phosphorus uptake rate of that sludge.Based on these results, the presently used method, in which the ratio of the anoxic phosphorus uptake rate (q^Pa) to the aerobic uptake rate (q^Po) gives the relative proportion of denitrifying polyphosphate-accumulating organisms (DPAOs) in the PAOs，is unreasonable.Furthermore, the PAOs community structure was related to the electron acceptor type.According to the type of electron acceptor, three groups of the PAOs could be proposed as follows：P_ON(using oxygen and nitrate as electron), P_O(using only oxygen as electron acceptor) and P_N (using only nitrate as electron acceptor).

Key words:

强化生物除磷, 聚磷菌, 反硝化聚磷菌, 电子受体, 菌群特性

摘要：

为了研究强化除磷系统中聚磷菌（PAOs）菌群特性，通过批次试验分别考察了厌氧/好氧（A/O）污泥和厌氧/缺氧（A/A）污泥吸磷特性。试验结果表明：A/O污泥好氧吸磷速率（q^Po）大于缺氧吸磷速率（q^Pa），而A/A污泥q^Po却小于q^Pa。基于此试验结果可得出目前普遍应用q^Pa与q^Po的比值表征反硝化聚磷菌（DPAOs）占PAOs的相对百分比的方法不合理。聚磷菌菌群构成与电子受体类型有关，根据电子受体类型可将PAOs分为三种，即：P_ON（既能以氧作为电子受体，也能以硝态氮作为电子受体）、P_O（只能以氧作为电子受体）和P_N（只能以硝态氮作为电子受体）。

关键词:

强化生物除磷, 聚磷菌, 反硝化聚磷菌, 电子受体, 菌群特性