The selected Roll-Up system (Figure

The selected Roll-Up system (Figure8) for household scale was designed to work under the following conditions: aeration regulation, leachate recycling, thermal and aeration control and effective microorganism additives. The 1st experimental phase included preliminary experiments in a stationary unit (Figure 99) with air supply and lasted 21 days. The whole process consisted of 3 experimental groups of input material (60 kg of organic MSW and 4 kg of straw). C/N ratio was measured, whereas the 1st experimental group was subjected to an aeration velocity of 2 L min-1. The 2nd followed with an aeration velocity of 3 L min-1 and 4 L min-1. Finally, the 3rd group included leachate collection and recirculation through the organic mass of the composting pit. The second experimental phase used the Roll-Up system and the degradation process lasted 15 days. The material was rolled at 50 cycles/min and resulted to less odour generation compared to results of the 1st experimental phase. Although the degradation process in the Roll-Up system was shorter than in a stationary unit (15 days instead of 21) and also gave fewer odors, several parameters in the Roll-Up system could not reach the appropriate standards of the process (e.g. temperature curve). The unit’s fast rolling may have resulted to these problems and it was thus decided to reduce rolling speed to less than 50 cycles/min.