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A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities
Published on: December 25, 2015
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Superior performance of a membrane bioreactor through innovative in-situ aeration and structural optimization using
Liguo Shen1, Qihang Wu1, Qunfeng Ye1
1College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, PR China; Key Laboratory of Watershed Earth Surface Processes and Ecological Security, Zhejiang Normal University, Jinhua 321004, PR China.
Water Research
|July 23, 2023
Summary
Optimizing membrane bioreactors (MBRs) structural design reduces membrane fouling. A novel in-situ aeration method significantly enhances antifouling potential by improving shear stress distribution and fluid dynamics.
Area of Science:
- Environmental Engineering
- Chemical Engineering
- Fluid Dynamics
Background:
- Membrane fouling is a critical challenge in membrane bioreactors (MBRs).
- Effective structural design is crucial for mitigating fouling and optimizing performance.
- Computational Fluid Dynamics (CFD) offers a powerful tool for simulating hydrodynamic characteristics.
Purpose of the Study:
- To optimize the structural design and operating conditions of a flat sheet (FS) MBR.
- To investigate key parameters influencing shear stress and liquid velocity for fouling mitigation.
- To evaluate the antifouling potential of a novel in-situ aeration method.
Main Methods:
- Utilized a three-dimensional computational fluid dynamics (CFD) model to simulate hydrodynamic characteristics.
- Investigated the impact of mixed liquor suspended solids (MLSS) concentration on shear stress distribution.
- Optimized bubble diameter and side baffle length for improved shear stress uniformity.
- Assessed a novel in-situ aeration method for enhanced turbulent kinetic energy and bubble streamline uniformity.
Main Results:
- Increased MLSS concentration led to higher and more uniform shear stress.
- Optimized bubble diameter (5 mm) and extended side baffle length improved shear stress distribution.
- The novel in-situ aeration method increased turbulent kinetic energy by 200 times, promoting uniform bubble streamlines.
- The novel aeration method demonstrated superior membrane antifouling potential.
Conclusions:
- The study provides a new approach for structural design and optimization of MBRs.
- CFD modeling combined with optimization techniques and novel aeration advances membrane separation technology.
- The findings contribute to improved efficiency and longevity of MBRs in wastewater treatment.
