气升循环分体式MBR中H循环管水力学研究  

Hydraulic research of H circulating pipe in airlift external circulation membrane bioreactor

作　　者：张晴[1] 樊耀波[1] 徐荣乐[1] 

机构地区：[1]中国科学院生态环境研究中心,北京100085

出　　处：《膜科学与技术》2014年第1期39-44,共6页Membrane Science and Technology

基　　金：国家自然科学基金(51278483)

摘　　要：以气升循环分体式MBR为研究对象,采用计算流体力学数值模拟方法,展开H循环管水力学条件优化研究.对H循环管的作用及H循环管管径大小的影响进行了模拟分析,并推导出H循环管循环流速U的计算公式.结果表明,H循环管对于气升循环分体式MBR具有必要性;膜单元与生物单元之间的循环流量随H循环管管径增大而增大,而当D/L(H循环管管径/膜池回流口长度)=22.2%时,H循环管平均循环流速最大,循环效率较高;推导得出H循环管内流速计算公式为:U=1/n R2/3(H0/l)(Qa1/v1A1-Qa2/v2A2[])1/2.本文研究结果可为MBR水力学研究与气升循环分体式MBR研究与应用提供科学依据和参考.Computational fluid dynamics （CFD） was implemented to study the hydrodynamic characteristics of H circulating pipe in airlift external circulation membrane bioreactor （AEC-MBR）. The role of H circulating pipe and the effect of different diameters of H circulating pipe on circulation were modeled and analyzed. Furthermore, formula of circulation flow velocity in H circulating pipe was deduced. The resultscirculating pipe asU=1/nR 2/3[（H0/l）（Qa1/u1A1-Qa2/U2A2）1/2 . The results and research method provide by thispaper can be used as a reference for？ further hydraulic study of MBR.

关 键 词：气升循环分体式膜生物反应器 H循环管 计算流体力学 

分 类 号：X703.1[环境科学与工程—环境工程]