Impact of the repetition of oxygen deficiencies on the filamentous bacteria proliferation in activated sludge.
Impact of the repetition of oxygen deficiencies on the filamentous bacteria proliferation in activated sludge.
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DOI：
10.1016/s0043-1354(02)00421-9
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发表时间：
2003-05
期刊：
影响因子：
12.8
通讯作者：
G. Gaval;J. Pernelle
中科院分区：
文献类型：
--
作者：
G. Gaval;J. Pernelle
在污水处理厂（WWTP）中经常会出现低压力的情况。由于它们对工厂运行没有明显的影响，因此通常不会引起注意。然而，这类案件的积累似乎会造成严重的业务问题。在污水处理厂试验中，研究了重复缺氧对丝状细菌球衣菌（Sphaerotilus natans）、海葵（Haliscomenophyll hydrossis）、Eikelboom型021 N和硫杆菌属（Thiothrix spp）增殖的影响。两个不同的缺氧系列进行了测试。采用荧光原位杂交技术监测活性污泥中丝状菌的演化。对于弱的缺陷，没有显着的变化，在丝状细菌的反应水平记录，而更严重的缺陷，丝状细菌的反应大大增加了应力数的增加。从所获得的结果来看，似乎存在强度和频率阈值，当连续施加应力时，超过该阈值，丝状细菌响应水平增加。这种“缺氧重复”似乎是出现膨胀的一个重要因素。
Cases of low stress can frequently occur in a wastewater treatment plant (WWTP). As they have no visible impact on the plant operation, they generally go unnoticed. Nevertheless, it would appear that an accumulation of such cases can result in serious operational problems. The impact of the repeated application of oxygen deficiency on the proliferation of the filamentous bacteria Sphaerotilus natans, Haliscomenobacter hydrossis, Eikelboom type 021N and Thiothrix spp has been studied on WWTP pilots. Two different oxygen deficiencies series were tested. Filamentous bacteria evolution in activated sludge was monitored using fluorescent in situ hybridization. For the weak deficiencies, no significant variation in the filamentous bacteria response level was recorded, whereas with more severe deficiencies the filamentous bacteria response increased considerably with the increase in stress number. From the results obtained, it would appear that there is an intensity and frequency threshold beyond which the filamentous bacteria response levels increase when the stress is applied in series. This “oxygen deficiencies repetition” appears to be an important factor in the appearance of bulking.