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

217.157 Membrane Bioreactors Treatment Systems (MBR)

Compiled Surveys from Vendors of MembranesCompiled Surveys from Vendors of Membranes Huber, Koch, Kruger, Kubota, Siemens, Zenon Huber, Koch, Kruger, Kubota, Siemens, Zenon

Results of Survey, Literature and Other State RegulationsResults of Survey, Literature and Other State Regulations

ConcernsConcerns Prevention of FoulingPrevention of Fouling Adequate aeration at high MLSS concentrationsAdequate aeration at high MLSS concentrations Achievable rate of flow through membranesAchievable rate of flow through membranes Adequate pretreatment i.e. fine screeningAdequate pretreatment i.e. fine screening HydraulicsHydraulics Ensure IntegrityEnsure Integrity Foam ControlFoam Control WarrantyWarranty Nutrient RemovalNutrient Removal

Membrane Bioreactors (MBR)

ApplicabilityApplicability SubmergedSubmerged Low-pressure, vacuum or gravity Low-pressure, vacuum or gravity Ultrafiltration or microfiltration Ultrafiltration or microfiltration

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

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

Membrane Bioreactors (MBR)

• CBOD5CBOD5 5 mg/l5 mg/l• TSSTSS 1 mg/l1 mg/l• AmmoniaAmmonia 1 mg/l1 mg/l• Total Nitrogen (w/pre-anoxic zone)Total Nitrogen (w/pre-anoxic zone) 10 mg/l10 mg/l• Total Nitrogen (w/pre-anoxic and Total Nitrogen (w/pre-anoxic and

post-anoxic zone)post-anoxic zone) 3 mg/l3 mg/l• Total Phosphorus (with chemical addition)Total Phosphorus (with chemical addition)

• 0.2 mg/l 0.2 mg/l • Total Phosphorus (with Bio-P removal)Total Phosphorus (with Bio-P removal)

• 0.5 mg/l0.5 mg/l• Turbidity Turbidity 0.2 NTU0.2 NTU• BacteriaBacteria up to 6 log removal (99.9999%)up to 6 log removal (99.9999%)• VirusesViruses up to 3 log removal (99.9999%) up to 3 log removal (99.9999%)

If proposed design is for higher quality effluent, If proposed design is for higher quality effluent, Pilot Study or Data from Similar Facility Pilot Study or Data from Similar Facility

Membrane Bioreactors (MBR)Expected Performance

MembranesMembranesHollow fiber or Flat plateHollow fiber or Flat plateNominal Pore Size Nominal Pore Size

Microfiltration 0.10 – 0.40 micronsMicrofiltration 0.10 – 0.40 micronsUltrafiltration 0.02 to 0.10 micronsUltrafiltration 0.02 to 0.10 microns

Common Membrane materialsCommon Membrane materialsPretreatment Pretreatment

Fine Screen - perforated plate or drum Fine Screen - perforated plate or drum Hollow fiber 1.0 - 2.0 mmHollow fiber 1.0 - 2.0 mmFlat plate 2.0 - 3.0 mm Flat plate 2.0 - 3.0 mm No BypassNo Bypass

Primary clarifier Primary clarifier Evaluated for > 1 MGDEvaluated for > 1 MGDGrit Removal Grit Removal excessive I/Iexcessive I/IOil and Grease Removal Oil and Grease Removal 50 mg/l50 mg/l

Membrane Bioreactors (MBR)

OperationOperation

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

Peak Daily Net flux rate @ 20 C 20 gfdPeak Daily Net flux rate @ 20 C 20 gfd

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

Operational Range for TMP Operational Range for TMP

Maximum Operational TMPMaximum Operational TMP

Hollow Fiber 2.0 – 10.0 psi Max Hollow Fiber 2.0 – 10.0 psi Max 12.0 psi12.0 psi

Flat Plate 0.3 - 1.5 psi Max Flat Plate 0.3 - 1.5 psi Max 3.0 psi3.0 psi

Operational Range of MLSS ConcentrationOperational Range of MLSS Concentration

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

Membrane Tank 4,000 – 12,000 mg/lMembrane Tank 4,000 – 12,000 mg/l

Operational control parametersOperational control parameters

SRT 10 – 25 days SRT 10 – 25 days

Membrane Bioreactors (MBR)

OperationOperationAmount of air used per square foot of membraneAmount of air used per square foot of membrane

0.01 – 0.04 SCFM / SF0.01 – 0.04 SCFM / SFMethod of Integrity Testing : In-line Turbidity <=1.0 NTUMethod of Integrity Testing : In-line Turbidity <=1.0 NTUHollow Fiber Pressure Decay TestingHollow Fiber Pressure Decay TestingSurface Wasting to Foam ControlSurface Wasting to Foam ControlRun in full manual mode or backup PLCRun in full manual mode or backup PLCAerationAeration

alpha value of 0.5 or loweralpha value of 0.5 or loweranoxic anoxic 0.5 mg/l DO0.5 mg/l DOaerobic aerobic 1.5 – 3.0 mg/l DO1.5 – 3.0 mg/l DOmembrane membrane 2.0 - 8.0 mg/l DO2.0 - 8.0 mg/l DO

Nutrient RemovalNutrient Removaldeoxygenate recycledeoxygenate recyclerecycle 300 – 600 percentrecycle 300 – 600 percent

Membrane Bioreactors (MBR)

RedundancyRedundancy

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

Peak FlowPeak Flow

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

RAS rate RAS rate

200 – 400 percent of influent200 – 400 percent of influent

WarrantyWarranty

5 year on Membranes5 year on Membranes

May require a 2 year performance bondMay require a 2 year performance bond

Membrane Bioreactors (MBR)

Engineering Report RequiredEngineering Report Required

Common range of valuesCommon range of values

Justification for using parameters outside the common Justification for using parameters outside the common rangerange

May be required to provide 2 year performance bondMay be required to provide 2 year performance bond

217.157 Membrane Bioreactors

Treatment Systems (MBR)

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

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

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

Manufacturers:Manufacturers:• Huber, Koch, Kruger, Kubota, Siemens, ZenonHuber, Koch, Kruger, Kubota, Siemens, Zenon

Membrane Bioreactors

References