SUEZ offers a new approach to waste management on landfills in which all resources are used to create positive-impact sites: no methane emissions from the waste, positive energy balance, no leachate released into the natural environment.
Reduction of the carbon footprint of household waste landfills by capturing and recovering biogas in order to produce electricity and heat.
With the Green Landfill project, SUEZ offers municipal waste management with zero environmental impact, and which is adapted to all contexts. This management would result in zero CH4 emissions from the waste breakdown process, no leachate discharges, and no plastic discharges into the environment.
Green Landfills contribute to circular economies by recovering green energy to produce biogas, which can then be reinjected into the gas distribution network or used to produce electricity and heat.
Biogas is produced from the anaerobic fermentation of the organic matter of the waste stored in covered waste compartments. It is collected using vertical wells, mixed or horizontal drains, and then prepared before being recovered for cogeneration. Its recovery into electricity is ensured by a biogas motor and requires prior dehumidification and activated carbon filtration.
On average, biogas production is at approximately 80 Nm3/t of landfill, for biogas containing 50% methane. A biogas motor with a capacity of 500 Nm3/h has an electrical capacity of 1MW.
For example, the Belgrade project includes two biogas motors with a combined electrical capacity of 3.2 MW. The electricity that is produced is used to power the site, in particular the leachate treatment unit, and/or sold to the electricity distribution network.
Heat production can be recovered, in particular, through the district heating network. In Belgrade, it reduces the natural gas consumption of the Konjarnick thermal power plant by almost 80% during the cold season.
Biogas is also used as a heating source for the site, replacing the fuel oil used in the boiler for the evaporation of concentrates from the membrane treatment of leachates.
Direct emissions generated by the company's activity.
Indirect emissions associated with the company's electricity and heat consumption.
Emissions induced (upstream or downstream) by the company's activities, products and/or services in its value chain.
Carbon sinks creation, (BECCS, CCU/S, …)
Emissions avoided by the activities, products and/or services in charge of the project, or by the financing of emission reduction projects.
Example taken from Belgrade :
Scope 1 - Reduction of diffuse CH4 emissions via biogas capture
- Quantification : - Annual reduction of approximately 150,000 t CO2e compared to the current uncovered landfill
Scope 2 - Reduction of emissions due to * the partial elimination of the site's own electricity consumption * the substitution of fossil energy used to reduce leachate treatment by-product
- Quantification : - 1 500 t CO2e per year
Emission Removal - Inorganic carbon (plastic, etc.) is sustainably sequestered in the waste compartments
- Quantification : Currently being determined
Avoided Emissions - Reduction in the consumption of natural gas for district heating and of non-renewable electricity for public distribution of electricity.
- Quantification : 22,000 t CO2e emissions avoided per year
(1) i.e. an average reduction in the volume of annual emissions from 225,000 tCO2e to 75,000 t CO2e (ADEME quantification protocol applied)
(2) Calculated on the basis of the “Protocol for the quantification of greenhouse gas emissions from waste management activities”, or “EPE Protocol”, and data from the IEA on the carbon content of the local electricity mix. Both protocols are in line with the GHG Protocol
In addition to its contribution to SDGs, this zero-impact landfill project introduces numerous co-benefits 11, 12 and 13:
- Production of water from treated leachates, which can be reused for agricultural or industrial ends (SDG 6 Clean Water and Sanitation)
- Conservation of natural assets (soil, water) and biodiversity thanks to site remediation, preservation of wildlife in the landfill zone (wetlands, nesting sites, etc.), elimination of leachate discharges into the natural environment (SDG 14 Life Below Water and SDG 15 Life on Land)
- Job creation: 50 direct jobs created in Belgrade in terms of operations (SDG 8 Decent Work and Economic Growth)
- Contribution to public health by avoiding fires, the use of aerosols and the dissemination of solid waste in the environment (ODD 3 Good Health and Well-being).
The Green Landfill project can be reproduced in any municipal waste recovery context. It is particularly well-suited for the remediation of existing landfills in emerging countries or countries in the process of integrating the EU, while also meeting increasingly strict regulations.
The success of this project relies on various factors:
* Compliance with local regulations in order to obtain an operating permit
* The presence of energy buyers on a local level (e.g. Electricity distribution network and district heating network)
Depending on the contractual model, a number of contracts (design, construction, operation) can be signed with local authorities and project partners.
Example taken from the Belgrade landfill: a construction contract and a 25-year operation and maintenance contract by a consortium composed of SUEZ, Itochu and the Marguerite Fund.