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Evaluation Methodology and Comprehensive Performance Evaluation for Optimization of BNR Wastewater Treatment  

Shin, Hyung-Soo (건국대학교 신기술융합학과)
Chang, Duk (건국대학교 환경공학과)
Ryu, Dong-Jin (건국대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.23, no.4, 2009 , pp. 417-430 More about this Journal
Abstract
A BNR comprehensive performance evaluation (BNR CPE) system was established employing system-oriented evaluation methodology for biological nutrient removal (BNR) processes based on the CPE techniques developed by U.S. EPA for evaluation of conventional biological processes. The BNR CPE system applied to five domestic BNR plants adopting $A^2/O$ process confirmed that all target plants except the smallest one had not any serious defective performance and process stability was enhanced with increasing plant size. The system also clearly verified relatively poor performances in anoxic reactors without exception mainly due to influent carbon limit rather than functional defect. Consistent good performances were confirmed even during both winter season and wet weather generally known to be difficult to achieve satisfactory removals. Presentation of evaluation results by modified radar chart system simplified and clarified the evaluation and analysis procedures. The BNR CPE system could not only discover readily the causes of present and prospective poor performances but also facilitate the suggestion of their optimization options. Mutual effect and cause-and-effect among operation parameters and unit processes were also found easily using the evaluation system. The system justified that the adverse effect of defective operating parameters could be compensated by other favorable parameters, especially in anaerobic and anoxic reactors as well as during the winter season.
Keywords
BNR; CPE; process evaluation; system-oriented evaluation methodology; diagnosis;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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