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Deborah Helstrom, P.E. Utilities Technical Review Water Supply Division 512-239-6705 [email protected]

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217.157 Membrane Bioreactors Treatment Systems (MBR). Deborah Helstrom, P.E. Utilities Technical Review Water Supply Division 512-239-6705 [email protected] 217.157 Membrane Bioreactors Treatment Systems (MBR). Information used to draft What it contains How to use the rule.

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slide1

217.157 Membrane Bioreactors Treatment Systems (MBR)

Deborah Helstrom, P.E.

Utilities Technical Review

Water Supply Division

512-239-6705

[email protected]

slide2

217.157 Membrane Bioreactors Treatment Systems (MBR)

  • Information used to draft
  • What it contains
  • How to use the rule
slide3

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
slide4

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

slide10

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
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