The morphology features of the granules were only slightly distinct at different high temperatures. The highest average diameter of the mature granules was 3.36 mm in SBR50, while mature granules with the average diameter of 2.19 mm were found in SBR30 and 2.62 mm in SBR40. Mostly, the measured diameter of the granules above 3 mm were identified only at 50 °C whereas at 30 °C and 40 °C, diameter of the granules predominantly ranged between 2 mm and 3 mm (Supplementary data, Fig. SD 1).