Compost from municipal solid wastes as a source of biochar for CO

Increasing greenhouse gas emissions contributing to the global climate change are a major concern of environmental protection. Developing adsorbents from lowcost and renewable resources is an attractive strategy. On the other hand, the high capacity of production rates of municipal solid waste, besides high methane emissions, is the origin of some eco-systemic challenges. The combination of the two environmental problems is considered by introducing the compost from a mechanical biological treatment of municipal solid wastes as a low-cost source of adsorbent for CO2 capture. The obtained compost was thermally and chemically activated and the CO2 adsorption capacities of prepared samples were evaluated. Samples prepared sequentially with sulfuric acid and heated at 800 C and vice versa, respectively, had the highest uptake capacities and were comparable with commercial adsorbents.This work was financially supported by: Project POCI-01-0145- FEDER-006984 – Associate Laboratory LSRE-LCM funded by FEDER through COMPETE2020 Programa Operacional Competitividade e Internacionalização (POCI) and project VALORCOMP (ref. 0119_VALORCOMP_2_P), financed through INTERREG V A Spain Portugal (POCTEP) 2014–2020 by national funds through FCT, and Project NORTE-01-0145-FEDER-000006, supported by Norte’s Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund, and by CIMO under UID/AGR/00690/2019. Mohsen Karimi acknowledges research grant awarded under Project: SFRH/BD/140550/2018 by Foundation for Science and Technology (FCT, Portugal).