## 4 Conclusions  
In this paper, the simple green and economic process, proposed to transform the OFMSW into an inert material was optimized, by the use of a catalyzed urea-formadehyde matrix. The use of a catalyzed UF matrix allows to significantly reduce the curing temperature of the blends during processing. A reduction of the curing temperature involves the formation of a more compact structure, characterized by a very low porosity.  
This is an important advantage for the implementation of this process in a smart machine to transform the organic waste into fully inert, odorless, sanitized panels/bricks that do not release eluants, leachates or biogases, therefore ensuring a high durability and valorizing the OFMSW without requiring an additional cost for its disposal. Furthermore, a full physical-mechanical characterization showed that the OFMSW/UF blends possess good mechanical properties, comparable to those of the neat thermosetting resin. In addition, the mechanical properties of the catalyzed blends are always higher than those of the non-catalyzed blends, as a consequence of the reduced porosity attained by curing at lower temperatures. The influence of different recycled additives, such as coffee powder, sawdust and sodium bicarbonate on both the curing process and the physical-mechanical properties of the OFMSW/UF blends composites was also assessed. The rheological characterization proved that the presence of the additives does not cause an increase in the curing temperature and time. On the other hand, the mechanical characterization results showed that the presence of both the sawdust and coffee in low amounts do not significantly modify the mechanical properties of the blends. In addition, the possibility of producing foamed materials through the addition of sodium bicarbonate was assessed. Sodium bicarbonate produces a decrease of the mechanical properties compared to the bulk material; however, compared to the foamed structure obtained in unanalyzed blends by water evaporation/boiling, the addition of sodium bicarbonate allows the formation of a controlled porous structure, which in turn results in an increase of the specific modulus.  
Finally, a cost estimation of the developed approach proved the potential cost saving compared to the neat matrix.  
In conclusion, the preliminary results obtained in this paper suggest that the process developed allows to produce valorized OFMSW composites materials, that can be used as building materials for thermal or acoustic insulation, as potential substitutes of the medium-density fibre (MDF) panels' and also for the outdoor garden furniture. The next research will be focused on the design and building of a prototype machine equipped with Arduino-based sensing stations to characterize the material during the different steps of the transformation process (stabilization, inerting, and valorization). In addition, the prototype machine will be equipped with a RFID-based traceability system supported by some remote cloud server functionalities in order to monitor the products along with the whole supply chain.  
[PERSON] and [PERSON] performed the experiments. [PERSON] and [PERSON] supervised the work. [PERSON] is the scientific responsible of the project.  
This work is funded by the project POIROT with CUP code B89J17000370008 supported by the MISE (Ministry of Economic Development) of Italy within the European Union's Horizon 2020 research and innovation program.  
The authors gratefully acknowledge SADEPAN CHIMICAL S.r.l. for supplying the Urea-Formaldehyde resin and for technical support.  
The authors declare no conflict of interest.