Troubleshooting Bnr Processes

This paper will present common operating challenges at biological nutrient removal (BNR) treatment plants, strategies for identifying potential problem areas, and case studies on several BNR facilities that were out of compliance with permit limits. Each of the facilities in these case studies experienced one or more of the operating challenges that prevented the BNR process from performing successfully. The case studies will summarize the evaluations that were performed and strategies chosen for remedying individual challenges in meeting permit requirements. Alternative approaches to improve process performance to provide consistent nitrogen and phosphorus removal are identified and prioritized.