浸没式膜-生物反应器中污泥浓度对错流速度及传氧速率的影响  

Influence of Sludge Concentration on Cross Flow Velocity and Oxygen Transfer Coefficient in A Submerged MBR

作　　者：张杰[1] 王志伟[1] 

机构地区：[1]同济大学环境科学与工程学院,上海200092

出　　处：《净水技术》2007年第6期41-45,共5页Water Purification Technology

基　　金：上海市市科委项目(062312023)

摘　　要：研究了浸没式膜-生物反应器中污泥浓度与膜面错流速度以及传氧速率之间的关系。结果表明,污泥浓度的提高使传氧速率系数下降,当污泥浓度从4.5g/L变化至21.5g/L,传氧速率系数从0.565降低至0.155。根据气液反应器理论进行传质分析表明,传氧速率系数的降低主要是由于污泥浓度增大引起了混合液粘度增大所致。同时污泥浓度的上升会导致膜面错流速度的降低,不利于控制膜污染。The correlations between sludge concentration and cross flow velocity （CFV） and oxygen transfer coefficient in a submerged membrane bioreactor （MBR） were studied in this paper. The results indicated that oxygen transfer coefficient decreased as sludge concentration increased in the MBR, and it reduced from 0.565 under sludge concentration of 4.5 g/L to 0.155 under sludge concentration of 21.5 g/L. According to the gas-liquid reactor theory, the decrease in oxygen transfer coefficient was mainly coused by the increase in viscosity of the mixed liquors with the increase in sludge concentration. It was also observed that the increase in sludge concentration resulted in the reduction of CFV along membrane surfaces which would influence the operation of the submerged MBR.

关 键 词：浸没式膜-生物反应器 污水处理 污泥浓度 错流速度 传氧速率 

分 类 号：TQ546.5[化学工程—煤化学工程] X703[环境科学与工程—环境工程]