**4. Conclusions**

The integration between the anaerobic digestion plant of biowaste with thermochemical processes such as hydrothermal carbonization coupled with the evaporation/thickening process and gasification of nonbiodegradable waste has been proposed and described.

The mass and energy balances have been reported in order to evaluate the feasibility of the proposed integrated "smart" facility.

The advantages obtained by using the smart facility design can be briefly summarized as follows:


*Exploitation of Digestate in a Fully Integrated Biowaste Treatment Facility: A Case Study DOI: http://dx.doi.org/10.5772/intechopen.92223*

By an economic point of view, the capital cost of the smart facility increases by a factor of 3. Anyway, the operating costs strongly decreased by considering the savings connected to the above listed advantages.

The strong reduction of transportation of waste and leachate by trucks, the minimization of air pollution and odor emission, the possibility to cover the electricity cost by self-producing itself without grid losses, the reduction of waste volume of more 95%, and the production of clean biofuel (biomethane) and a highadded value char (hydrochar), all these positive features allow to consider the smart facility and even a green facility.
