AUTh/ LHTEE BIOREGIO 5th International Conference on Sustainable Solid Waste Management Perspectives of energy recovery from food waste generated from hotels G. Perkoulidis and N. Moussiopoulos Aristotle University Thessaloniki, Lab. of Heat Transfer and Environmental Engineering E-mail: [email protected]
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AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Perspectives of energy recovery from food waste generated from hotels
G. Perkoulidis and N. MoussiopoulosAristotle University Thessaloniki,
Lab. of Heat Transfer and Environmental EngineeringE-mail: [email protected]
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Aristotle University Thessaloniki (AUTh) – Faculty of Engineering - Laboratory of Heat Transfer and Environmental Engineering (LHTEE)
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Preparation, buffet and customer plate leftover waste in a hotel
Source: Papargyropoulou et al., 2016
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
17,240 biogas and 367 biomethane plants in Europe
Source: European Biogas Association, 2017
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
The aimTo propose an economic and environmentally sustainable solution for energy recovery from food waste in hotels located in Central Macedonia, Greece
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Hotels are located in urban and rural areas
Source: Google Earth ®
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
The seven regional units of Central Macedonia, Greece
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Number of beds in hotels in Central Macedonia
Source: Papadimitriou, 1995 Source: Regional Association of Solid Waste Management Agencies of Central Macedonia, 2016
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Percentage of produced food waste in the regional units of Central Macedonia
• Occupancy rate of beds in hotels during the tourist season: 70% of hotels’ capacity
• 68 t of food waste / day = 70% x 88,196 beds x 1.1 kg of food waste per customer and day
Source: Regional Association of Solid Waste Management Agencies of Central Macedonia, 2016
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Produced biowaste during the 6 months of tourist season in the regional units
Co-digestion Biodegradable municipal waste: 600 t/d; food waste: 80 t/d
306
Co-digestion Biodegradable municipal waste: 1,200 t/d; food waste: 500 t/d
571
Anaerobic digestion and pyrolysis
Sludge: 300 t/d; food waste: 200 t/d 561
Source: De Clercq et al., 2016
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Calculated treatment cost in low capacity anaerobic digestion facilities
Low-cost systems can produce electricity and be economically viable in ways similar to the large-scale, capital-intensive systems
Source: Lansing et al., 2008
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Contribution of anaerobic digestion process to climate (1/2) By diverting 1 t of biodegradable waste from a landfill
towards anaerobic digestion to produce biogas and fertilisers could prevent up to 2 t of CO2 equivalent emissions as it was stated by a review of comparative Life Cycle Assessment of food waste management systems and by European Commission
The emission factor of 185 kg CO2 eq./t of biowastetreated through anaerobic digestion was proposed by Smith et al. (2001) for calculating the total greenhouse gas flux, where the sum of fossil and sequestered C were taken into account
Sources: Bernstad and la Cour, 2012, EU, 2017, Smith et al. 2001
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Contribution of anaerobic digestion process to climate (2/2) The emission factor of
126 kg CO2 eq./t of biowaste treated through anaerobic digestion was proposed by DEFRA (2011) for calculating the total greenhouse gas flux
Sources: Athens Biowaste model software, 2015
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Energy recovery potential during the 6 months of tourist seasonRegional
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Conclusions (1/2)
The amount of food waste that has to be disposed in landfills in the regional units of Central Macedonia could be reduced by 10% w/w [68 t of food waste from hotels / (35% w/w * 1,900 t of municipal solid waste)]
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management
Conclusions (2/2)
The total greenhouse gas emission savings from the anaerobic digestion of hotel biowaste in the seven regional units of Central Macedonia during the tourist season of six months will be 2,261 t CO2
AUTh/LHTEE
BIOREGIO5th International Conference on Sustainable Solid Waste Management