I s a b e l O r t i z , Y . T o r r e i r o , G . M o l i n a , M . M a r o ñ o , J . M . S á n c h e z .
E n e r g y v a l o r i s a t i o n o f f u e l s a n d w a s t e u n i t . E n e r g y d e p a r t m e n t . C I E M A T . M a d r i d , S p a i n .
A feasible application of circular economy: spent grain energyrecovery in the beer industry
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
Summary
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
Introduction (beer industry, beer residues, energy necessities)
Beer industry
Beer residues: BSG
Energy requirements
Valorization of Beer Spent Grain (BSG)
BSG characterization
Integration of BSG gasification in a craft brewing
Conclusions
EU 2nd largest beer producer in the world with 400 million hl
Brewing sector industrial, mid-size, small…
Environmental issues water consumption, wastewater,
solid waste, CO2….
Introduction
By-products produced
BSG 20 kg/hl beer
Hot trub 0.3 kg/hl beer
Yeast 0.2 hl/hl beer
CO2 3.3 kh/hl beer
Energy requirements
CO2 for transfer 0,37 kg/hl beer
Electricity 23.8 kWh/hl beer
Gasoil 31 kWh/hl beer
Total energy 54.8 kWh/hl beer
85%
Beer Brewing Process
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
Introduction
Waste-to-Energy
Gasification of BSG
Diminish waste volumeReduce energy from fossil
fuels
Beer Industry
BSG
Gasification
Engine/Boiler
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
Anaerobic digestionAnaerobic digestion Combustion/GasificationCombustion/Gasification
Biogas production Most common No drying Long degradation
rates/retention time Technical know-how High OPEX and CAPEX
Combustion Good LHV Drying necessary Emission (particles, SOx,
NOx)
Gasification Good LHV Drying necessary Versatile Low environmental impact High electrical performance
Valorization of BSG
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
Moisture (% b.s.)
Ash (% b.s.)
Volatile Matter (% b.s.)
Fixed Carbon (% b.s.)
LHV (MJ/kg b.s.)
76 3 79 18 19
BSG characterization
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
Pretreatment of BSG
Wet BSGH: 76%
BSGpellets
BSGpellets
Dry BSGH: 10%
Dry BSGH: 10%Drying Pelletizing
Energy from non-renewable sources: 192 kJ/kg
Energy consumption = 900 kJ/kg
Gasification of BSG
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
Engine
Boiler
Syngas
LHV = 6 MJ/Nm3
Ygas = 2.2 Nm3/kg
Power = 3.2 kWhth/kgEconsumed = 1 kWhth/kg
Econsumed = 0.03 kWhth/kg
Integrated solution
Beer production
BSG> 100 Ton/y
Drying- 5,4 MWh/y
Pelletizing-6 MWh/y
Gasification69,7 MWh/y
Gas conditioning-0,7 MWh/y
Energy production
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
Beer> 5000 hl/y
Energy:Gasoil: 18.8 hl/y
Electricity: 120 MWh/y
Integrated solution
Beer production
BSG> 100 Ton/y
Drying- 5,4 MWh/y
Pelletizing-6 MWh/y
Gasification69,7 MWh/y
Gas conditioning-0,7 MWh/y
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
Beer> 5000 hl/y
Energy:Gasoil: 18.8 hl/y
Electricity: 120 MWh/y
Boiler41,4 MWh/y
Engine13,7 MWh/y
Boiler
22%Engine
12%
Conclusions
Reduce of fossil fuels (12 - 22 %)
Avoid CO2 emissions
Help to mitigate climate change
Reduce the waste volume
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
Thank you for your attention
6th International Conference on Sustainable Solid Waste Management. NAXOS2018. 13-16 June.
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