Eerste Ervaringen metAnaerobe MBR

First Experience withAnaerobic MBR

Jan Pereboom

1. Introduction to Veolia

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Veolia Water NederlandHarnaschpolder / Van Nelle

340,000 emp

100,000 emp

10,000 emp

1. Introduction BiothaneSpecialist in anaerobic wastewater treatment

30 years of experience

500 referencesPart of Veolia since 2008

3 offices worldwide • BC, BSI, BAP

Biothane CorporationCamden NJ

USA

Biothane SystemsInternational

Delft, The Netherlands

Biothane AsiaPacific (VWS SEA)

Singapore

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1. Introduction Biothane TechnologiesUpflow Anaerobic Sludge Bed (UASB) • Granular sludge technology

• Load 8-15 kg COD/m3/d

• 250 references

Expended Granular Sludge Bed (Biobed EGSB)• Granular sludge technology

• Load 15-25 kg COD/m3/d

• 220 references

Biobulk (CSTR)• Suspended sludge technology

• Load 2-5 kg COD/d

• 13 references

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1. Introduction BiothaneExperience in Dairy and Related Industries

19 Full Scale Plants

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Iglo – Lagnese – Heppenheim - Germany

2. Drivers for Anaerobic MBR

Specific wastewater characteristics • FOG (Fat, Oil & Grease) and LCA (Long Chain Fatty Acids)

Hamper granulation in UASB (EGSB)

• High concentrations; e.g. WheyUn-diluted: no granulation in UASB due to high HRT

Diluted: too large UASB reactor volumeSolution low loaded CSTR systems

Higher loading rate in CSTR digester• Uncoupling of HRT and SRT by use of membranes

Higher COD removal efficiencies• More Biogas; smaller post treatment; more compact

Clear effluents

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2. Drivers for Anaerobic MBR

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Characteristic CSTR digester AnMBR

SRTSolids Retention Time

up to 1 – 2 times HRT up to 4 – 8 times HRT

Loading rate 2 – 5 kgCOD/m3/d 5– 10 kgCOD/m3/d

Volume Large Smaller

Footprint Large Smaller

COD removal efficiency Reasonably highup to 85 - 95%

Highup to 99.5%

Effluent quality Poor, high TSS content Good, no suspended solids !!

Energy production High Even higher, energy consumption of membranes more than off-set by additional methane production

3. Early Developments on AnMBRAqua Renaissance Project in Japan 1987-1993 • + 30 companies; lab scale and pilot scale• Combining conventional Anaerobic Reactors with Membranes• Various membranes and wastewatersResults• Technically very difficult; Reactors instable and Membrane Fouling • Commercially not feasible

Starch wastewaterUASB / Flat ceramic

SewageUASB / capillary Sulfonic

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3. Early Developments on AnMBR

Kubota; Japan; flat sheet sub-merged; as off 2000• Food Processing 2~6.5 m3/d 3#• Night Soil 16~20 m3/d 3#• Distillery/Shochu 15~60 m3/d 3#

Kubota/ADI; USA 2009• Food processing; retrofit

• 400 m3/d; 99%COD; 8 kgCOD/m3/d

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4. Challenges for Anaerobic MBR

Only 10-20% of Membrane Flux as compared to Aerobic • Large membrane area; high cost

• Limited to small flows and high concentrations

Scouring, Back-flush and Cleaning not enough• Biogas scouring complex approach

Scaling (inorganics) potentially more pronounced • Scaling also in permeate due to biogas stripping

Optimizing Flux by combination of:• Bioreactor design and operation

• Membrane unit design and operation

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5. Biothane Anaerobic MBR

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Biothane AnMBRSimplified Process Flow Diagram

34-38°C

5. Anaerobic MBR at Daisy Brand (USA)Beta scale operated since 2007

75 m3/d; 50,000 mgCOD/l

HRT 8 days; 5-8 kgCOD/m3/d

99.5% COD removal

Tubular Norit X-flow membranes

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Digester Equalization Tank

5. Anaerobic MBR at Daisy Brand (USA)

ull Scale since 2009 in Texas

90 m3/d; 62,000 mgCOD/l; 11 tonCOD/day

RT 8 days; 5-8 kgCOD/m3/d

ermeate: <200 mgCOD/l; TSS < 1 mg/l

9.5% COD removal

ubular Norit X-flow membranes

econd Full Scale since 2010 in Arizona

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DigesterEqualization Tank

Digester feed 60,000 mg/l on leftAnMBR permeate 200 mg/l on right

5. Anaerobic MBR at Daisy Brand (USA)Full scale Performance Texas

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9 tCOD/day

6. Biothane Anaerobic MBRCompact Digester; low footprint (8 kg/m3/d)

High COD concentrations > 20~30 g/l

Very high COD removal efficiencies

Minimal or no post-treatment

Minimal membrane fouling by• Reactor design; mixing

• Tubular cross-flow membrane units

• Solids and inorganics handling and removal

Modular solution to existing plants

Strategic cooperation with Norit

Unique solution by Biothane - Veolia

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6. Biothane Anaerobic MBR

Cross-flow membranes implies:• Easy access also during operation

• No need for biogas recirculation

• Easy CIP cleaning possible for scaling

• No system shut down for repair, replacement or maintenance of membranes

Short start-up time; any anaerobic seeding

No sludge granulation required

Inorganics can more easily be handled

Robust in handling COD changes, COD load peaks, hydraulic peaks

Modular design; also for small flows

Easy Odor Control

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6. Near Future Outlook Biothane AnMBRDairy and Whey offered to clients

More complex wastewaters; SS, FOG

Lower COD concentrations

Lab Scale Research in Delft and at Universities

Pilot Scale Research at clients

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Thanks for your attention

Please visit our booth with questions

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