厌氧折流板反应器的水力流态模拟及优化

Simulation and Optimization of Hydraulic Flow Pattern in Anaerobic Baffled Reactor

以苏北某化工园区集中式污水处理厂的厌氧折流板反应器(ABR)为原型,利用Flu-ent软件对其反应区的流态进行数值模拟,发现反应区内存在较为严重的短流及旋流现象,导致污泥流失和处理效果不佳。为此提出了优化集水堰布置方式、在反应室底部配水区增设分流挡板等改造措施,以改善反应区上升流态和消除旋流。模拟显示:反应器上部的上升流速较小,且沿断面呈均匀分布,有利于截留污泥;在反应器中部形成三个较为强烈的涡流区,增强了泥水混合效果。采取上述措施进行改造后,ABR反应器的处理效果及抗冲击负荷能力均有较大提高。

The numerical simulation of flow pattern in anaerobic baffled reactor （ABR） used in WWTP in a chemical inddstry park in North Jiangsu was carried out. The results found that serious short flow and vortex flow existed in the reactor, which led to sludge loss and poor treatment efficiency. Im- provement methods of the flow pattern were proposed, including optimizing the wastewater weir layout and adding flow diversion baffle in wastewater distribution zone at the bottom of the reactor. The simulation showed that the flow velocity was small and evenly distributed along the cross-section in the upper part, contributing to the sludge retention. Three relatively strong central vortexes were formed in the middle, which strengthened sludge and wastewater mixing. After reconstruction using the above measures, the treatment efficiency and the shock load resistance of the reactor were improved.