膜生物反应器中影响膜透水率的几个因素

本文研究了影响膜 -好氧生物反应器中中空纤维膜透水率的几个因素 ,如组件长度、操作压力、膜面流速、活性污泥浓度和温度。中空纤维膜内 ,压力沿料液流动方向呈抛物线型分布 ,所以在膜内径和膜面流速一定的情况下 ,存在一个最佳的膜组件长度 Llin使得膜利用率最高 ,且最省能 ;操作压力对膜透水率的影响分为三个区域 ,各个区域膜的主要过滤阻力不同 ,不同污泥浓度时 ,为了使中空纤维膜内腔不堵塞 ,膜面流速必须高于某一范围 ,膜透水率随温度呈正比例关系变化。

SEVERAL FACTORS AFFECTING MEMBRANE FLUX IN MEMBRANE BIOREACTOR

In membrane bioreactor(MBR), module length, the mixed liquid suspended solid concentration(MLSS), operating pressure, cross flow velocity and temperature of mixed liquid all influence the water flux of membrane bioreactor. In the hollow fibre membrane, pressure distribution is in the form of parabola, thus, under the condition of membrane internal radio and flow rate on membrane surface given, there is an optimum membrane module length L lin which makes the membrane utlization ratio to be the highest and the energy consumption to be the most economic. In order to not block the inner pore of hollow fiber membrane, the cross flow velocity on membrane surface must be higher than a given range. The membrane flux changes directly proportionally with temperature.