Dual Optimization Strategy for N and P Removal in a Biological Wastewater Treatment Plant

A systematic approach is proposed to find optimal operational conditions for nitrogen and phosphorus (N, P) removal in a biological nutrient removal process. The approach is a dual optimization strategy using modeling, variable selection, design of experiments, and optimization with multiple respons...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2009-07, Vol.48 (13), p.6363-6371
Main Authors: Kim, MinHan, Rao, A. Seshagiri, Yoo, ChangKyoo
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
General purification processes
Pollution
Process Design and Control
Sewerage works: sewers, sewage treatment plants, outfalls
Wastewaters
Water treatment and pollution
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Summary:A systematic approach is proposed to find optimal operational conditions for nitrogen and phosphorus (N, P) removal in a biological nutrient removal process. The approach is a dual optimization strategy using modeling, variable selection, design of experiments, and optimization with multiple response surface methodology. The study focused on determining interactive effects between independent variables for N and P removal, which were selected through a new sensitivity analysis considering the effluent quality index. After selecting key operational variables, a multiple response surface model based on a new desirability function was used for the dual optimization of both N and P removal. The proposed method was applied to a standard A2O process and obtained the optimized removal efficiencies of 78.0% and 80.0% for N and P, respectively. This study confirmed that the proposed dual optimization method was useful to systematically optimize N and P removal in a biological nutrient removal process and also can be applied to any other biological processes.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie801689t