During WP5, the following activities will be performed:
• HTC tests on selected substrates, varying the process conditions and characterizing the process products in terms of their chemical and physical characteristics;
• identification of the most significant properties of the HTC products for them to be used in hydroponic systems (i.e., the process liquid as a solution for fertirrigation and the hydrochar as a solid substrate for plants growth);
• evaluate any post-treatment necessary to obtain products eventually compatible with hydroponic systems.
The experimental tests on the digestates selected in the WP4 will be carried out in cooperation with the Free University of Bolzano, using a lab scale HTC reactor made and developed by HBI. Different process variables (e.g., temperature and water-substrate ratio) will be varied and the effects of these variations will be assessed in terms of yield and product characteristics.