1. © 2014 HDR Architecture, Inc., all rights reserved. © 2014 HDR, Inc., all rights reserved.

2. © 2015 HDR, Inc., all rights reserved. Dave Kinnear, Erika Bailey, Mario Benisch, JB Neethling ACHIEVING REVISED AMMONIA CRITERIA: DESIGN AND OPERATION

3. Revised Ammonia Criteria Statistical Reliability Design and Operation Conclusions Theory and Modeling

4. 01 REVISED AMMONIA CRITERIA

5. Effluent Ammonia DO Depletion Eutrophication Fish Toxicity Mussel Toxicity 2013 EPA criteria working into State permit writing process: 30 – 60% reduction in in-stream criteria. EPA REVISED AMMONIA CRITERIA Criterion (Duration) 1999 Criteria Based on Juvenile Salmonids Final 2013 Criteria Single Criteria Mussels Present pH 8.0 T=25°C pH 7.0, T=20°C pH 8.0, T=25°C pH 7.0, T=20°C Acute, mg/L (1-hour average) 5.6242.617 Chronic, mg/L (30-day average) 1.24.50.56 1.9 1.0 mg/L MA 0.25 – 0.75 mg/L MA?

6. 02 STATISTICAL RELIABILITY

8. 03 THEORY AND MODELING

9. MIXED LIQUOR FORMATION

10. NITROGEN TRANSFORMATION

11. www.werf.org/nutrients Nutrient Compendium Reference Guide for Proposed Terminology For Nutrient Management Stacey Passaro JB Neethling H. David Stensel

12. MALLARD CREEK WASTEWATER TREATMENT PLANT Q (DAF) = 12.0 MGD Q (ADF) = 7.5 MGD 3-Train MLE Process Tertiary Traveling Bridge Filter Mesophyllic Anaerobic Digestion Influent Nitrogen Mass Equalization

13. BASE Configuration

14. 04 DESIGN AND OPERATION

15. Dewatering Schedule Solids Retention Time Reactor Hydraulics Influent Equalization Aerobic Reactor Volume Environment

16. Dewatering Schedule A

17. Solids Retention Time B

18. B’

19. Aerobic Reactor Volume C

20. Reactor Hydraulics D

21. D’

22. Influent Equalization E

23. E

24. THE IDEAL CASE Staggered Dewatering, 15-day SRT, 8 Reactors, Influent EQ

25. Environment F Effect of Temperature on the BASE Case

26. Environment F’ Effect of Temperature on the IDEAL Case

27. NITROGEN TRANSFORMATION ?

28. NITROGEN TRANSFORMATION

29. 05 CONCLUSIONS

30. RAC may decrease effluent ammonia requirements. Confirm statistical reliability of existing process. Model theoretical potential of the existing process. Apply proven design and operation techniques to optimize performance. Avoid tertiary process requirements. CONCLUSIONS

31. © 2015 HDR, Inc., all rights reserved. Dave Kinnear, Erika Bailey, Mario Benisch, JB Neethling ACHIEVING REVISED AMMONIA CRITERIA: DESIGN AND OPERATION

32. © 2014 HDR Architecture, Inc., all rights reserved. © 2014 HDR, Inc., all rights reserved.