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Simulation and Study of Factors Affecting on Distribution of Dissolved Oxygen in A2/O-MBR Process

Authors： YUAN Xing, YANG Min, LUO Nan, FAN Yaobo*

Units： Research Center for Eco-Envionmental Sciences, Chinese Academy of Sciences, Beijing 100085,China

KeyWords： computational fluid dynamics；oxygen mass transfer；A2/O-MBR；distribution of dissolved oxygen

ClassificationCode：X703.1

year,volume(issue):pagination： 2016,36(1):61-71

Abstract：

The fluid characteristics and the distribution of dissolved oxygen in an A2/O-MBR were simulated by coupling computational fluid dynamics (CFD) with the oxygen mass transfer model in this paper. And the factors influencing on the distribution of dissolved oxygen considered for this work were aeration rate, sludge concentration and bubble diameter. The results indicated that the higher aeration rate could result in higher dissolved oxygen concentration and bigger aerobic zone, however, on the contrary, the higher sludge concentration would cause lower dissolved oxygen concentration; with increasing the bubble diameter, the dissolved oxygen concentration decreased significantly and the wall shear stresses on membrane were increased sharply but the liquid velocity in the A2/O-MBR was not affected obviously. It also showed that there may be a lower value of aeration rate and a moderate data of bubble diameter to establish the desire conditions for denitrification and phosphorus removal with lower energy consumption in the A2/O-MBR.

Funds：

国家自然科学基金（51278483）

AuthorIntro：

第一作者简介：袁星（1989-），女，浙江嘉兴人，硕士生，研究方向为计算流体力学（CFD）与氧传质模型耦合方法在一体式A2O-MBR中的应用研究，E-mail:smile19891027@126.com.*通讯作者，E-mail:ybfan@rcees.ac.cn

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