Overview
ABSTRACT
Anaerobic digestion has various advantages: waste recovery, low-carbon energy, local production, circular economy... In order to improve the profitability of the sector, a co-product can be reused: CO2. Although the technical and economic feasibility of reuse of CO2 from anaerobic digestion depends on local conditions of production, transport, market, uses... the possibilities are numerous. Among these, agricultural uses - cultivation of algae, greenhouse cultivation - or methanation are of real interest.
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Read the articleAUTHORS
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Laurent DUMERGUES : Environmental impact assessment project manager APESA, Montardon, France
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Christine PEYRELASSE : Biomass and effluent project manager APESA, Montardon, France
INTRODUCTION
With a view to achieving national carbon neutrality targets by 2050, methanization offers a number of advantages. A true case of the circular economy, methanization enables organic waste to be converted into renewable energy (biogas) and agricultural fertilizers/fertilizers (digestates). This low-carbon activity boosts local economic activity and helps limit greenhouse gas emissions linked to outsourced production (energy, fertilizer manufacture, etc.).
In order to reinforce these assets (control of GHG emissions, circular economy, increased farm income...), the methanization sector has an interest in valorizing the emissions of one of its co-products: the CO 2 derived from biogas. Several CO 2 recovery prospects exist, notably with agricultural uses or biological methanation.
After a reminder of the issues involved and an overview of GHG emissions from anaerobic digestion, this article will look at the main viable recovery methods and the conditions for their application (regulatory, technical, economic, etc.).
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KEYWORDS
CO2 | methanation | anaerobic digestion | power to gas | reuse | cultivation of algae | greenhouse culture
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