www.berghofmembranes.com Optimization of biogas generation plants with tubular membranes THE LEADER IN TUBULAR MEMBRANES
www.berghofmembranes.com
Optimization of biogas generation plants with tubular membranes
THE LEADER IN TUBULAR MEMBRANES
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Berghof MembranesThink Outside the Box
Berghof Membrane Technology GmbH,
part of the Berghof Group, is the
leading manufacturer of tubular
membranes for the filtration and
separation of process streams and
wastewater for industrial applications.
Berghof Membranes
The Leader in Tubular Membranes
1,500 +
Installations
50 + Years of
Experience
MBRRO
Concentrate
Energy
Reduction
Wastewater
Recycling
Reduced
External
Water
Reuse of
Valuable
Materials
AnMBR
Berghof Membrane Technology GmbH part of the
Berghof Group, is the leading manufacturer of tubular
membranes for the filtration and separation of process
streams and wastewater in a variety of industries.
Biogas Plants
Anaerobic Membrane Biorreactor (AnMBR) for
high-strenght and high-solid wastewaters (food and
beverage, dairy, ethanol, distilleries, vinasses)
Digestate treatment:
• MBR
• Direct Filtration
External Filtration System
Feed Membrane Membrane surface Flux Permeate flowrate Energy Measures
TSS Diameter Material Module Skid Average Skid Average Maximum skid
g/l mm m2 l/m2.h m3/h kWh/m3 L*W*H
AnMBR 20-308 mm PVDF
PVDF CR
53.4 374-74820-55 7.5-41.0 1.8-4
10.5*2.0*2.4MBR 10-25 55-65 20.0-48.0 0.5-0.8
Direct Filtration 0.3-10 5 mm 67.2 470-941 75-100 35.0-94.0 0.3-0.5
Anaerobic membrane bioreactor (AnMBR)
Anaerobic membrane
bioreactor (AnMBR) combines
anaerobic digestion with
membrane filtration.
Anaerobic membrane bioreactor (AnMBR)
• B-SMART® external filtration system coupled to simple CSRT digester
• Higher Organic Loading Rate (OLR), 6-10 kg
COD/m3.day, respecting conventional CSTR digester
• Uncoupled hydraulic and solids retention times with
complete solids retention and controlled sludge age.
• Suitable for highly concentrated organic wastewater
streams with COD concentrations in excess of
15g/l up to 250g/l
• The process is more tolerant to TSS and FOG than
granular anaerobic systems and thus provides
simplified pre-treatment requirements.
Advantages of AnMBR
• No need granular sludge. Very short star-up time and less operational
problems. Robust process
• Greater tolerance of TSS, FOG and salinity. Simpler pre-treatment.
• Superior quality effluent. Complete SST removal and tipically >98%
COD removal. Some cases even direct application of RO after the
AnMBR is possible.
• No need for post-treatment or lower requirements. Smaller footprint.
• Higher biogas production, up to 25%
• Excellent solution for high-strenght and high-solid wastewaters
(Food and Beverage, Dairy, Ethanol, distilleries, vinasses,…
Advantages of AnMBR
Anaerobic
reactor
Wastewater UF permeate
AnMBR
Operational Conditions
Anaerobic Digester
MLSS 20 g/L (standard)
OLR 6-10 kg COD/m3.day
Berghof B-SMART®
Flux 20-30 Lmh
Crossflow velocity 1-2 m/s
Energy demand 1,8-4 kW/m3
AnMBR
Configuration
Containerized UF system
Anaerobic
Bioreactor
Feed and
CIP/Flushing/back
wash station skid
UF skid
AnMBR
Dairy Industry
Project Site: Wisconsin
Permeate Flow: 2160 m3/day
System: External AnMBR
COD Influent: 50.000 mg/L
COD removal: >99%
Membranes: 8mm PVDF, back washable
Filtration skids: 2 double loop
Energy: 3 kW/m3
Membrane
lifespan: 5 years
Application: Treat anaerobic discharge at dairy facility
and generate additional heat & electricity
Digestate Treatment
This biogas production process generates a residual product called anaerobic digestate.
The characteristics of this residual product are: organic matter difficult to biodegrade, high
presence of suspended solids and an elevated nitrogen concentration.
Digestate Treatment
MBR
Digestate treatment is a multi-step process that encompasses the following steps: MBR with
B-SMART® external UF and double stage/double pass Reverse Osmosis.
Benefits Generated by this process:
• 80% pure water which meets all discharge limits. Example:
COD levels up to 10ppm. Companies reutilize this rich
source of pure water for their industrial needs on site.
• 20% Reverse Osmosis concentrate that can be either
evaporated into an organic fertilizer or utilized in the
humidification process for compost production
COD reduction 99,8%
TS reduction 99,5%
TKN reduction 99,4%
Recovery RO 75-80%
Digestate Treatment
MBR
Case study - Italy
MBRDigestate from the fermentation of municipal solid waste.
Digestate treatment
Direct Filtration
Another option for the treatment of the digestate is to replace the biological treatment (MBR) with
a direct filtration with external B-SMART® UF and then an RO stage can be added or not.
CONCENTRATE
Case study- Italy
Direct Filtration
Digestate from the fermentation of slaughterhouse wastewater.
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