基于CFD的内压式MBR污水处理过程的模拟与仿真

Simulation and Simulation of Internal Pressure MBR Wastewater Treatment Process Based on CFD

摘要: MBR (膜生物反应器)是近年来新兴的一种高效水处理技术，其处理原理为利用膜分离设备将污水中的活性污泥和大分子有机物截留住，这个过程的本质就是固液分离。为研究MBR的污水处理过程，我们使用CFD相关软件对这一过程进行模拟仿真。首先选定内压式MBR的膜组件部分进行建模和网格划分。然后使用欧拉多相流模型，分别将膜丝管内流体设置为水与悬浮颗粒。通过FLUENT计算求解本模型，发现500次迭代后，残差曲线约在17次时收敛。最后把计算结果导入后处理软件使其可视化，观察发现膜组件各处压力分布和水流走向与实际情况相符。同时使用某污水厂的真实数据进行了计算验证，证明本模型是可靠有效的。

Abstract: MBR (membrane bioreactor) is an emerging high-efficiency water treatment technology in recent years. Its working principle is to use the membrane separation equipment to intercept the acti-vated sludge and macromolecular organic matter in the sewage. The essence of this process is solid-liquid separation. To study the wastewater treatment process of MBR, we simulated the process using CFD-related software. First, the membrane module portion of the internal pressure MBR is selected for modeling and meshing. Then, we use the Euler multiphase flow model to set the fluid in the membrane tube as water and suspended particles. The model was solved by FLUENT calculation, and it was found that after 500 iterations, the residual curve converges at about 17 times. Finally, the calculation results were imported into the post-processing software for visualization. It was observed that the pressure distribution and water flow direction of the membrane module were consistent with the actual situation. At the same time, the actual data of a sewage treatment plant was used for calculation and verification, which proved that the model is reliable and effective.