217.157  Membrane Bioreactors Treatment Systems (MBR)
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Deborah Helstrom, P.E. Utilities Technical Review Water Supply Division 512-239-6705 dhelstro@tceq.state.tx - PowerPoint PPT Presentation


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217.157 Membrane Bioreactors Treatment Systems (MBR). Deborah Helstrom, P.E. Utilities Technical Review Water Supply Division 512-239-6705 dhelstro@tceq.state.tx.us. 217.157 Membrane Bioreactors Treatment Systems (MBR). Information used to draft What it contains How to use the rule.

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217.157 Membrane Bioreactors Treatment Systems (MBR)

Deborah Helstrom, P.E.

Utilities Technical Review

Water Supply Division

512-239-6705

dhelstro@tceq.state.tx.us


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217.157 Membrane Bioreactors Treatment Systems (MBR)

  • Information used to draft

  • What it contains

  • How to use the rule


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Membrane Bioreactors (MBR)

Compiled Surveys from Vendors of Membranes

  • Huber, Koch, Kruger, Kubota, Siemens, Zenon

    Results of Survey, Literature and Other State Regulations

    Concerns

  • Prevention of Fouling

  • Adequate aeration at high MLSS concentrations

  • Achievable rate of flow through membranes

  • Adequate pretreatment i.e. fine screening

  • Hydraulics

  • Ensure Integrity

  • Foam Control

  • Warranty

  • Nutrient Removal


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Membrane Bioreactors (MBR)

Applicability

  • Submerged

  • Low-pressure, vacuum or gravity

  • Ultrafiltration or microfiltration

  • 217.8(b)(2) Approval of Nonconforming and Innovative Technologies

    • May require pilot study and/or 2 year performance bond


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Membrane Bioreactors (MBR)

Expected Performance

  • CBOD5 5 mg/l

  • TSS 1 mg/l

  • Ammonia 1 mg/l

  • Total Nitrogen (w/pre-anoxic zone) 10 mg/l

  • Total Nitrogen (w/pre-anoxic and

    • post-anoxic zone) 3 mg/l

  • Total Phosphorus (with chemical addition)

    • 0.2 mg/l

  • Total Phosphorus (with Bio-P removal)

    • 0.5 mg/l

  • Turbidity 0.2 NTU

  • Bacteria up to 6 log removal (99.9999%)

  • Viruses up to 3 log removal (99.9999%)

    If proposed design is for higher quality effluent,

    Pilot Study or Data from Similar Facility


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    Membrane Bioreactors (MBR)

    Membranes

    Hollow fiber or Flat plate

    Nominal Pore Size

    Microfiltration 0.10 – 0.40 microns

    Ultrafiltration 0.02 to 0.10 microns

    Common Membrane materials

    Pretreatment

    Fine Screen - perforated plate or drum

    Hollow fiber 1.0 - 2.0 mm

    Flat plate 2.0 - 3.0 mm

    No Bypass

    Primary clarifier Evaluated for > 1 MGD

    Grit Removal excessive I/I

    Oil and Grease Removal 50 mg/l


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    Membrane Bioreactors (MBR)

    Operation

    Average Daily Net flux rate @ 20 C 12 to 20 gfd

    Peak Daily Net flux rate @ 20 C 20 gfd

    Two Hour Peak Daily Net flux rate @ 20 C 24 gfd

    Operational Range for TMP

    Maximum Operational TMP

    Hollow Fiber 2.0 – 10.0 psi Max 12.0 psi

    Flat Plate 0.3 - 1.5 psi Max 3.0 psi

    Operational Range of MLSS Concentration

    Bio Reactor 4,000 - 10,000 mg/l

    Membrane Tank 4,000 – 12,000 mg/l

    Operational control parameters

    SRT 10 – 25 days


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    Membrane Bioreactors (MBR)

    Operation

    Amount of air used per square foot of membrane

    0.01 – 0.04 SCFM / SF

    Method of Integrity Testing : In-line Turbidity <=1.0 NTU

    Hollow Fiber Pressure Decay Testing

    Surface Wasting to Foam Control

    Run in full manual mode or backup PLC

    Aeration

    alpha value of 0.5 or lower

    anoxic 0.5 mg/l DO

    aerobic 1.5 – 3.0 mg/l DO

    membrane 2.0 - 8.0 mg/l DO

    Nutrient Removal

    deoxygenate recycle

    recycle 300 – 600 percent


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    Membrane Bioreactors (MBR)

    Redundancy

    N+1, trains, units or storage. Show calculations

    Peak Flow

    Peak Ratio of 2.5 requires Equalization, off-line storage or reserve membrane capacity

    RAS rate

    200 – 400 percent of influent

    Warranty

    5 year on Membranes

    May require a 2 year performance bond


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    217.157 Membrane Bioreactors

    Treatment Systems (MBR)

    • Engineering Report Required

    • Common range of values

    • Justification for using parameters outside the common range

    • May be required to provide 2 year performance bond


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    Membrane Bioreactors

    References

    • “So, You Decided to Build an MBR?: Tips to help optimize process performance”, Merlo, Rion et al, WE&T, www.wef.org/magazine November 2006.

    • State of Washington, Department of Ecology, “Orange Book”, Sewage Treatment Design Criteria

    • Water Environment Federation, Membrane Systems for Wastewater Treatment, 2006

    • Manufacturers:

      • Huber, Koch, Kruger, Kubota, Siemens, Zenon