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ROTATING BIOLOGICAL CONTACTOR (RBC) PROCESS. Prepared By Michigan Department of Environmental Quality Operator Training and Certification Unit. ROTATING BIOLOGICAL CONTACTORS. Contactors. Primary Treatment. Secondary Clarifier. Effluent. Influent. Solids Removal.

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ROTATING BIOLOGICAL CONTACTOR (RBC) PROCESS


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    1. ROTATING BIOLOGICAL CONTACTOR (RBC) PROCESS Prepared By Michigan Department of Environmental Quality Operator Training and Certification Unit

    2. ROTATING BIOLOGICAL CONTACTORS Contactors Primary Treatment Secondary Clarifier Effluent Influent Solids Removal

    3. RBC Secondary Treatment Rotating Plastic Media Provides Large Surface Area 1.6 rpm 40 % Submerged Microorganisms “Treat” the Wastewater by Using Organics

    4. New Cells NH3 CO2 H2O Wastewater Slime Layer Cell Membrane Food Storage Oxygen Enzymes (Absorption) Adsorbed Particle Soluble Organics

    5. Oxygen Organics Liquid Film Biomass Media (disc) Oxygen

    6. Liquid Film Liquid Film Random Continuous Sloughing OXYGEN Organics BIOMASS Media

    7. RBC Flow Scheme INFLUENT Primary Treatment Rotating Biological Contactors Pretreatment Disinfection Secondary Clarifiers EFFLUENT Solids Handling

    8. ADVANTAGES OF RBC PROCESS Simple Operation Low Energy Requirements Nitrification Few Nuisances Wide Flow Range Large Biological Population

    9. ADVANTAGES OF RBC PROCESS Simple Operation Low Energy Requirements Nitrification Few Nuisances Wide Flow Range Large Biological Population Handles Shock Loads Low Head Loss

    10. DISADVANTAGES OF RBC PROCESS Limited Controls Enclosures Limited Experience and Training

    11. RBC COMPONENTS CONTACTOR TANK CLARIFIER

    12. RBC COMPONENTS CONTACTOR Discs Shaft Individual Disc

    13. Media “High Density” Polyethylene Carbon Black

    14. Media – Irregular Surface Maintain Spacing Increases Rigidity Increases Surface Area Increases Contact Time

    15. Media – Irregular Surface “Corrugated”

    16. Media – Irregular Surface “Dimpled”

    17. “Random Fill”

    18. Media 1 Inch BIOMASS

    19. 10 to 12 Ft Diameter ~ 25 Ft Long

    20. Media High Density Standard Density 1 inch ¾ inch

    21. Shaft Square Shaft

    22. Round Shaft

    23. Octagonal Shaft

    24. Bearings “Floating” Self-aligning

    25. Bearings

    26. Shaft Bearing Load Cell Coupling for Hydraulic Pump Load Cells

    27. Load Cells Purpose: Determine Weight of Contactor to Determine Amount (Thickness) of Biomass

    28. Drive Systems - Chain

    29. Drive Systems - Direct

    30. Drive Systems - Air Air Cups Air Header Air Diffusers

    31. Drive Systems - Air Air Cups Rotation Air Header

    32. Drive Systems - Air

    33. Drive Systems - Air

    34. Drive Systems - Combination

    35. Containment

    36. Containment Just Large Enough Good Contact Minimal Short Circuiting Good Mixing

    37. “Train” FLOW FLOW RBC Systems Usually More Than One Contactor with Flow Progressing in Series in a “Train”

    38. Flow Schemes Parallel to Shaft Direction of Flow Perpendicular to Shaft Contactors May be Arranged With Flow Either Parallel or Perpendicular to Shafts

    39. Influent Effluent Baffles “Train” Small Systems – Train May be One Contactor with Separations and Baffles

    40. Larger Systems – Contactors are Set in Series in Separate Tanks or in One Tank With Enclosure Effluent Influent Baffles

    41. Baffles

    42. Train Baffles FLOW FLOW Baffles Separate Each Contactor, Dividing the Flow in the Train Into Separate Complete Mix Zones of Treatment

    43. Train Baffles FLOW Each Zone of Treatment is Called a “Stage”

    44. Train Baffles FLOW 5 Stages (Zones of Treatment)