Eerste Ervaringen metAnaerobe MBR
First Experience withAnaerobic MBR
Jan Pereboom
1. Introduction to Veolia
2
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
3
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
4
1. Introduction BiothaneExperience in Dairy and Related Industries
19 Full Scale Plants
5
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
6
2. Drivers for Anaerobic MBR
7
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
8
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
9
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
10
5. Biothane Anaerobic MBR
11
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
12
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
13
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
14
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
15
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
16
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
17
Thanks for your attention
Please visit our booth with questions
18
Top Related