## 3 Results and Discussion
### Commissioning of Full-Scale Technology and Adjustment of Process Parameters  
The process begins in a batching machine by feeding raw material into four hoppers, from which different volumes of ash, subject to subsequent granulation, are dosed (Figure 2a). SHA from each hopper is fed along a separate conveyor belt to the main belt elevator (Figure 2b). The SHA feeding volumes are determined by changing the rotation frequency of the individual conveyor belts in the range of 12-120 Hz. The main belt elevator transports the SHA samples to the mechanical grinder where the larger fractions are crushed, and the entire sample volume is brought to a powdery state (Figure 2c). The next stage of the process covers the mixing of SHA samples and it is performed in a humidifying mixer where the sample is prepared for granulation (Figure 2d). The facility includes an open vessel equipped with two counter-rotating shafts, each covered by 20 blades. According to the commercial granularot facility requirements, the inlet moisture of the samples has to be in the range of 20-25 wt. % to carry out the process of granulating. Since the supplied SHA from different source are characterized with moisture contents in very wide range of 3-30 wt. % because of their different manners of storage and logistic, the preliminary treatment is required. Primary experiments and analyses have shown that very low moisture content in SHA samples (<5 wt. %) leads to a loss of material in the bunkers and the main elevator belt due to its high volatility, while very high moisture content (>15 wt. %) leads to the deposition of SHA on the walls of the facilities. All the supplied samples with a moisture content outside the estimated range are subjected to preliminary exposure to atmospheric conditions, protected from rainwater, to release or adsorb water content. The commissioning process continued with setting the operating parameters of the humidifier mixer. We performed tests in the following sequence: measuring the SHA sample moisture with an IR analytical scale at the inlet of the humidifier mixer (W\({}_{\text{in}}\) in wt. %); dosing of technical water flow through nozzles placed in the shafts (G\({}_{\text{tw}}\) in  
Figure 2: Delivered and constructed facilities by Green Circle Biotech Ltd. at the Polski Trambesh site: (**a**) the batching sector consists of four bunkers; (**b**) individual conveyor belts; (**c**) main belt elevator; (**d**) humidifying mixer. L/min); measuring the SHA sample moisture with an IR analytical scale at the outlet of the humidifier mixer (W\({}_{\text{out}}\) in wt. %). Numerous experimental tests and optimizations were performed, and, as a result, the operating parameters of the water pumps were defined, depending on the necessary flow based on the initial moisture of the SHA samples and the targeted W\({}_{\text{out}}\) = 22 wt. %. Table 3 presents the established working regimes of the humidifying mixer with an optimal load for a full-scale system of 4 tons per hour for final production. After the humidifying mixer, the process continues in the granulator as the SHA sample is transported through another belt elevator. The granulator is a closed vessel with a diameter of 1.8 m, a length of 12 m, a constant rotation speed of 14 rpm, and a 2\({}^{\circ}\) slope (Figure 3a). A rubber insert layer with a 0.008 m thickness covers the total inner surface of the vessel. During the commissioning, we observed the adhesion of SHA to the inner walls, and, as such, we installed an additional hammer mechanism outside of the granulator facility. The next stage of the process is drying the obtained granules in a rotary drum heater with a diameter of 1.8 m, a length of 18 m, and a constant speed of 4 rpm (Figure 3b). A propane-butane burner produces the heat for the drying process, and a fan with capacity of 20,000 m\({}^{3}\)/h ensures the air flow.