*3.2. Spatial and Temporal Distribution Changes*

Figures S1–S172 show the spatial and temporal changes in piles as follows: temperature (Figures S1–S41) and the concentration of O2 (Figures S41–S85), CO2 (Figures S86–S129) and CO (Figures S130–S169) in individual sections, at weekly intervals during the biostabilization process in individual piles. The right side of the pile was facing to the south and after the semi-permeable membrane was removed, it was exposed to direct sunlight on the day of the measurement, but measurements were taken inside the pile. No heating effect of exposure to the sun was observed inside the pile.

As the terms "hot" and "cold" spots in waste reactors were not found in the literature, they are defined here as localized areas within the pile where all three measured parameters (Table 4) were met in the same place and at the same time. All hot and cold spots recorded in this study are shown in Table 5 (cold spots) and Table 6 (hot spots). Locating these points is of great practical importance.

Hot spots—areas of elevated temperature, liable to loss of stability of the biocenosis (high temperature > 60 ◦C with low oxygen < 15% can cause the loss of valuable microorganisms). Cold spots—areas where conditions for sanitizing the waste by inactivating potential pathogens and parasites cannot be maintained (low temperature < 30 ◦C reduce the efficiency of microorganisms or induce the switch to spore formation).


**Table 4.** Characterization of hot and cold spots identified in this study.

In either case, the quality of stabilized waste may be reduced, or the process time increased.
