MOSAIC project aims at addressing “How feasible/profitable is the local-produced biochar to boost quality of Estarreja contaminated soils?” by assessing and transferring technological development over the following hypotheses: (i) biochar can be produced from renewable feedstocks existing in Estarreja; (ii) pyrolysis parameters can be tuned to match biochar production suitable for both immobilisation of soil contaminants and controlled release of valuable plant nutrients; (iii) enhanced activity of the soil microorganisms enriched onto biochar benefits both soil remediation and fertility; and (iv) the microbial-laden biochar can turn into an innovative Estarreja-based fertiliser, providing that its agronomic value and cost-effectiveness are ensured through proper techno-economic assessment. The project team gathers expertise in environmental biotechnology, thermochemical conversion engineering, soil science and economics towards an innovative transdisciplinary research approach that will benefit stakeholders from Estarreja.