Duchène P, Cotteux E, Capela S
Cemagref, Unité de recherche qualité et fonctionnement hydrologique des systèmes aquatiques, Parc de Tourvoie, Antony, France.
Water Sci Technol. 2001;44(2-3):203-10.
Because the aeration system in an activated sludge plant typically represents a large part of the total energy requirements, designers and operators need accurate oxygen transfer information to make the aeration system as energy efficient as possible. This paper presents clean water tests performed at 38 wastewater treatment plants. The Specific Aeration Efficiency results (SAE, kgO2/kWh) are reported for: (1) large open channels (volume higher than 1000 m3), (2) small open channels, (3) total floor coverage cylindrical tanks, and (4) cylindrical tanks with a grid arrangement. Some practical guidelines can be drawn, some of them being: (1) high SAE can be achieved at small aeration tanks (< 1000 m3), applying cylindrical tanks with a total floor coverage arrangement of diffusers, volumetric blowers, and moderate air flow rates per diffuser area; (2) the high investment cost of this configuration can be justified with respect to a grid layout characterized by spiral liquid circulation which affects the oxygen transfer; (3) small open channels can meet sufficient SAE values but fail to meet in this range of tank volumes those of total floor coverage cylindrical tanks.
由于活性污泥处理厂的曝气系统通常占总能源需求的很大一部分，因此设计人员和操作人员需要准确的氧气传递信息，以使曝气系统尽可能高效节能。本文介绍了在38个污水处理厂进行的清水测试。报告了以下几种情况的比曝气效率结果（SAE，kgO₂/kWh）：（1）大型明渠（容积大于1000立方米），（2）小型明渠，（3）全地面覆盖式圆柱形水池，以及（4）带有格栅布置的圆柱形水池。可以得出一些实用指南，其中包括：（1）在小型曝气池（<1000立方米）中，采用扩散器、容积式鼓风机全地面覆盖布置且每个扩散器区域空气流量适中的圆柱形水池，可实现较高的SAE；（2）相对于以螺旋液体循环为特征且影响氧气传递的格栅布局而言，这种配置的高投资成本是合理的；（3）小型明渠可以达到足够的SAE值，但在该水池容积范围内，无法达到全地面覆盖式圆柱形水池的SAE值。
