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Water Research Foundation Tailored Collaboration # 4448

Water Research Foundation Tailored Collaboration # 4448 Optimizing Filter Conditions for Manganese Control During Conversion to Biofiltration. North Texas Chapter TAWWA Meeting August 22, 2013. Greg Pope Gary Smith Chance Lauderdale Kara Scheitlin John Zwerneman Mary Jo Kirisits.

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Water Research Foundation Tailored Collaboration # 4448

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  1. Water Research Foundation Tailored Collaboration # 4448 Optimizing Filter Conditions for Manganese Control During Conversion to Biofiltration North Texas Chapter TAWWA Meeting August 22, 2013 Greg Pope Gary Smith Chance Lauderdale Kara Scheitlin John Zwerneman Mary Jo Kirisits

  2. The discussed project includes the combined efforts of multiple partners • The Water Research Foundation • Trinity River Authority (Project Sponsor) • Carollo Engineers • The University of Texas • A Project Advisory Committee includes staff from - • Virginia Tech • US EPA • University of Illinois • American Water

  3. The presentation objectives outline project purpose Tarrant Country Water Supply Project (TCWSP) background and Mn history Remaining studies and future work Review of biological filtration enhancement strategies Evaluate Conversion to Biofiltration at TRA Emphasis on Acclimation and Manganese Removal Study summary and preliminary conclusions Pilot-scale biofilter testing of selected enhancement strategies

  4. Tarrant Country Water Supply Project background and Mn history

  5. TRA Basin-Wide Facilities/Projects

  6. Lake Arlington Raw Water Intakes

  7. Manganese Concentration (mg/L)

  8. Winner of the 2013 Best Tasting Water Contest at TWUA NCTRS

  9. TRA-TCWSP Plant

  10. The TCWSP process includes ozonation and conventional process NaOH, Ammonia Alum Ozone Chlorine Polymer BWW Raw Water Effluent Clearwell Ozonation BW Flocculation/Sedimentation Filtration

  11. The process will convert to biofiltration for improved T&O removal and finished water stability NaOH, Ammonia Alum Ozone Chlorine Polymer BWW Raw Water Effluent Clearwell Ozonation BW Flocculation/Sedimentation Biofiltration TRA, Carollo, and the WaterRF are seeking to optimize the conversion process in a 9-month pilot study focused on biofilter enhancement

  12. Biofiltration Basics

  13. Biofiltration is modified conventional filtration Chlorine + = Granular Media Filter Biofilter

  14. Biofiltration improves finished water stability Disinfection Chlorine/ Chloramines • Reduced re-growth potential • Reduced corrosion potential • Reduced taste and odor • Reduced DBPs • Improved residual Filter Influent Enhanced Organic Removal

  15. Biofiltration targets a wide range of contaminants • Organics: dissolved organic carbon, includes regrowth potential, color, DBP precursors • Inorganics: sulfide, iron, manganese • Trace Organics: Tastes and odors (MIB, geosmin), endocrine disruptors, pharmaceuticals, DBPs, pesticides

  16. What is “Engineered Biofiltration™” and how does it help?

  17. “Engineered Biofiltration” Filtration and Biological Activity should drive design and operation of biofilters

  18. Oxygen Nutrients (P, N) Biodegradable Organic Carbon Effective biofiltration requires a nutritional balance EPS Intermediates, Carbon Dioxide, Water

  19. Oxygen Nutrients (P, N) Biodegradable Organic Carbon What happens when the bacteria’s nutritional balance isn’t met? EPS X Intermediates, Carbon Dioxide, Water

  20. Biofilter Enhancement Strategies: Nutrients

  21. Oxygen Nutrients (P, N) Biodegradable Organic Carbon Effective biofiltration requires a nutritional balance EPS Intermediates, Carbon Dioxide, Water

  22. Oxygen Nutrients (P, N) Biodegradable Organic Carbon Effective biofiltration requires a nutritional balance EPS Intermediates, Carbon Dioxide, Water Manganese (Cometabolism)

  23. Biofilter Enhancement Strategies: Substrate

  24. Oxygen Nutrients (P, N) Biodegradable Organic Carbon Substrate may enhance microbial growth Manganese (cometabolism) EPS Intermediates, Carbon Dioxide, Water

  25. Oxygen Nutrients (P, N) Substrate may enhance microbial growth Manganese EPS BDOC BDOC BDOC Intermediates, Carbon Dioxide, Water BDOC BDOC Substrate

  26. Biofilter Enhancement Strategies: pH Adjustment

  27. A MneV-pH diagram illustrates the Mn form for a given water quality Particulate Mn Soluble Mn

  28. During conventional filtration, Mn is removed by chlorine oxidation and filtration Filter Applied pH Chlorinated E0

  29. When chlorine is no longer applied particulateMn formation is less favorable Background pH Chlorinated E0 Background E0

  30. Increasing the filter applied pH shifts Mn towardsa precipitated phase Background pH Background E0

  31. Increasing the filter applied pH shifts Mn towardsa precipitated phase Background pH Enhanced pH Background E0

  32. Pilot Study Basics

  33. Our pilot design mimics potential full-scale strategies Ozonated Influent NutrientsSubstrate Nutrients Nutrients pH Adj. Substrate Mn, MIB F110 F130 F120 F140 15.5 inches 9 inches Effluent/ BW Supply Nutrients, (pH Adjustment, Substrate) Nutrients Control Nutrients, pH Adjustment

  34. Objectives • Enhance/Facilitate the biofilter acclimation process • Identify operational strategies for improved Mn control • Assess robustness (Mn spiking, simulated filter/chemical feed shutdowns) • Microbial Characterization (community analysis) • DOC removal • Trace organic removal (MIB Geosmin) • Distribution system impacts (chloramine demand and DBP formation)

  35. Filtration Performance

  36. Turbidities throughout the Study maintained compliance with the USEPA Surface Water Treatment Rule

  37. Mn Treatment Performance

  38. Collected Mn data illustrate benefits of biofilter enhancement Biofilter Influent

  39. Collected Mn data illustrate benefits of biofilter enhancement Biofilter Influent Control Biofilter

  40. Collected Mn data illustrate benefits of biofilter enhancement Biofilter Influent Control Biofilter Nutrient Biofilter

  41. Collected Mn data illustrate benefits of biofilter enhancement Biofilter Influent Biofilter Influent Nutrient/pH Biofilter Control Biofilter Nutrient Biofilter

  42. Collected Mn data illustrate benefits of biofilter enhancement Biofilter Influent Biofilter Influent Nutrient/pH Biofilter Control Biofilter Nutrient Biofilter Nutrient/pH/ Substrate Biofilter

  43. Collected Mn data illustrate benefits of biofilter enhancement Biofilter Influent Nutrient/pH Biofilter Full-Scale CFE Control Biofilter Nutrient Biofilter Nutrient/pH/ Substrate Biofilter

  44. Collected Mn data illustrate benefits of biofilter enhancement

  45. Collected Mn data illustrate benefits of biofilter enhancement Biofilter Influent

  46. Collected Mn data illustrate benefits of biofilter enhancement Biofilter Influent Control Biofilter

  47. Collected Mn data illustrate benefits of biofilter enhancement Biofilter Influent Control Biofilter Nutrient Biofilter

  48. Collected Mn data illustrate benefits of biofilter enhancement Biofilter Influent Control Biofilter Nutrient Biofilter Nutrient/pH Biofilter

  49. Collected Mn data illustrate benefits of biofilter enhancement Nutrient/pH/ Substrate Biofilter Biofilter Influent Control Biofilter Nutrient Biofilter Nutrient/pH Biofilter

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