三相流运动力学对减缓膜生物反应器膜污染的理论分析

Analysis of decreasing the membrane fouling mechanisms based on three-phase flow dynamics theory

运用气、液、固三相流运动力学原理对一体式膜生物反应器运行过程分析,得出:①反应器膜外污染的临界流速与膜管抽吸压力及主腔宽度、曝气条件的关系;②膜管内膜壁存在或不存在凝胶层条件下,产生污染的临界速度与膜管径、污染物粒径、膜管内抽吸压力、膜管内流态及膜壁对污染物吸附力的关系;③消除膜污染运行控制措施及条件.

The performance of submerged membrane bioreactors was analyzed by using gas, liquid and solid three - phase flow dynamics theory in this paper. From the theoretical analysis, it can be seen that the relationship between the critical velocity of membrane outer surface and suction pressure, the width of cross - flow section and the aeration , the relationship between the critical velocity of membrane inner surface with or without gel layer and membrane pipe diameter, particle size, suction pressure, flow condition and attraction force of the particles. The counter- measures to eliminate membrane fouling were also discussed.