一体式膜生物反应器运行参数间运动力学分析

Analysis of Dynamics among Running Parameter in a Submerged Membrane Bioreactor

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反应器内错流流速与曝气量、反应器设计高度、主副腔的过流面积的关系。曝气量越大、反应器主腔高度越高、主腔的过流面积越小、副腔过流面积越大,反应器内错流流速越大;②膜抽吸压力与反应器内膜污染错流临界流速及主腔宽度的关系。减小管膜的抽吸压力,减小主腔的宽度,可减小膜面不淤临界流速;③膜管内污染的临界速度与膜管径、污染物与膜壁吸引力关系,消除膜污染的运行控制条件。

In this paper, the running process is analyzed using dynamics theory of gas, liquid and solid three -phase flow. Three conclusions are received. First, the connection of cross -flow velocity with aeration rate, bioreactor size design, flowing section area of main and subsidiary chamber is obtained, which aeration rate is higher, main chamber height is higher, flowing section area of main chamber is smaller, flowing section area of subsidiary chamber is bigger, so the cross - flow velocity is bigger. Second, the connection of suction pressure with critical velocity of membrane fouling, and width of main chamber is acquired, which suction pressure and width of main chamber are decreased, thus deposit critical velocity of membrane surface can be decreased. Third, the connection of critical velocity of membrane pipe inner fouling with membrane pipe diameter, attraction of pollutants and membrane wall. The control conditions of eliminating membrane fouling are attained.