Cyrous Gilani, P.E. (City of Los Angeles) Kenneth R. Redd, P.E. (City of Los Angeles)

1. A Side-By-Side Test of 4 Different Types of Media in Bio-trickling Filters@Hyperion Treatment Plant Cyrous Gilani, P.E. (City of Los Angeles) Kenneth R. Redd, P.E. (City of Los Angeles) Michael J. Sarullo, P.E. (City of Los Angeles) R. Tim Haug, Ph.D., P.E., (City of Los Angeles) City of Los AngelesDept. of Public WorksBureau of EngineeringEnvironmental Engineering Division WEF/A&WMA ODORS AND AIR POLLUTANTS 2010Charlotte, North CarolinaMarch 2010

2. Project Background The City is building 2 Air Treatment Facilities (ATFs) along the path of two large diameter interceptor sewers. The ATFs involve Bio-trickling filter technology as the primary air treatment stage followed by carbon adsorption as the polishing stage. In an effort to improve the BTF performance, a new media manufactured by Taiwan based Matala Water Technology was identified and tested at the Hyperion Plant. Through a joint effort between Daniel Mechanical Company and City of Los Angeles, a test unit consisting of 4 identical reactor vessels was designed and manufactured to test different types of media under the same condition (a side-by-side comparison test). Installation was completed and testing began June of 2009.

3. 3’ Diameter, 10’ high One level media, 3’ high 2’ Sump at the bottom of each unit Re-cycled Irrigation supplemented with nutrient Continuous Irrigation Continuous make-up water and nutrient 4-Vessels Test unit Fabricated ByDaniel Mechanical Company

4. 4-Vessels Test UnitBy Daniel Mechanical @ HTP

5. 4-Vessels Test UnitTop View

6. 4-Vessels Test UnitBy Daniel Mechanical @ HTP

7. Recirculation and Nutrient System

8. Make-Up Water and Drain Systems

9. Foul Air Supplied to Each Unit Through one Manifold System

10. Separate Nutrient Tank for Each Unit

11. Selected Media

12. Selected Media Matala SM 365 Zander Media Virgin Carbon Lava Rock Media

13. Spray Pattern Adjustment

14. H2S Removal Efficiency (Matala)Start-Up

15. H2S Removal Efficiency (Zander)Start-Up

16. H2S Removal Efficiency (Lava Rock)Start-Up

17. H2S Removal Efficiency (Matala)2nd Start-Up

18. H2S Removal Efficiency (Zander)2nd Start-Up

19. H2S Removal Efficiency (Lava Rock)2nd Start-Up

20. Odor Removal All Media

21. % Odor Removal All Media

22. H2S Removal All Media on the Odor Test Event

23. % H2S Removed All Media on the Odor Test Event

24. H2S Mass Loading, 15 Sec EBRT, Matala

25. H2S Mass Loading, 15 Sec EBRT, Zander

26. H2S Mass Loading, 15 Sec EBRT, Lava Rock

27. Summary of Performance Effective and consistent H2S removal on all three media. The vessel containing the lava rock performed well during the 1st start-up. However, during the 2nd start-up, its performance dropped. The pH of the vessel containing lava rock was measured to be approximately 2.5 for the duration of this test. Numerous attempts were made to lower the pH by reducing the make-up water. Lowering the rate of the make-up water did not affect the pH. Matala and Zander both demonstrated excellent performance in terms of H2Sremoval. Although all three media effectively removed H2S, significant amounts of odors attributed to other odor causing compounds, remained in the outlet air stream of each vessel. Inlet odor measurements ranged from 10,000 to 50,000 odor units, while outlet odor measurements for all three media ranged from 2,500 to 5,000 odor units. There was no direct correlation between remaining odors and H2S levels in the outlet air stream, indicating that the majority of remaining odors were not caused by H2S.

28. NCOS ATF SiteUnder Construction

29. NCOS ATF SiteUnder Construction

30. ECIS ATF SiteUnder Construction

31. ECIS ATF SiteUnder Construction

32. WEF/A&WMA ODORS AND AIR POLLUTANTS 2010Charlotte, North CarolinaMarch 2010 QUESTIONS City of Los AngelesDept. of Public WorksBureau of EngineeringEnvironmental Engineering Division