The Metropolitan Area of Barcelona, one of the pilot territories of the Biocircularcities project, is characterised by a very dense context and where biowaste management was initially introduced in the early 90s and subsequently extended. Biowaste (from households and commercial activities biowaste plus green waste) represents 39.9% of the municipal solid waste. The source-separated biowaste has been increasing constantly since 2002. There are 4 facilities treating the separately collected biowaste: 2 composting plants that exclusively receive biowaste separated at source and obtain compost as a final product. The other two plants have anaerobic digestion followed by a composting step to obtain compost. A separate biological treatment line, they stabilise the organic output from the mechanical treatment of residual waste. The resulting material cannot be used as compost, as it does not meet the requirements for application in agriculture. The high rate of impurities in the biowaste and the high rate of biowaste that is still in the residual waste indicate that there is room for improvement and there are biowaste flows underexploited in line with biocircular economy principles.
Having in mind these different parameters, the goal for the Metropolitan Area of Barcelona with the Biocircularcities project will be to incentivise quality and quantity of biowaste separately collected in the urban context represented by the area of Barcelona and exploring the feasibility of producing added value bioproducts.
8 December 2021