Advanced BioWin Modeling for MBR Process Design Optimization: A Case Study of a Split Conventional/MBR Design
Over the past few years, utilization of advanced activated sludge process simulation models such as BioWin and GPS-X has increased significantly. These process simulation models are powerful tools for evaluation, optimization, and design of BNR/ENR plants. The use of MBRs has also increased significantly. MBRs pose unique process design challenges when considering enhanced biological phosphorus removal and nitrogen removal. The air scour in the membrane tank creates high DO conditions and then this mixed liquor with elevated DO is returned to the bioreactor at 4 to 5 Q which results in challenges to effective biological phosphorus removal and denitrification, while at the same time maintaining high mixed liquor concentrations in the upfront anaerobic and anoxic tanks to maximize the MBR effectiveness (lower volume). Process simulation models can be used to effectively evaluate the impacts of different air scour routines on membrane tank DO, different operating mixed liquors and recycle flows, and to evaluate different recycle configurations and influent feed points to optimize the design. Utilization of a properly developed and calibrated process model, such as BioWin, using site specific wastewater characterization is highly recommended for the biological process design of MBRs, especially when considering stringent effluent permit limits.
Document Type: Research Article
Publication date: 2008-01-01
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