Related to physic-chemical analyses results, temperature and
pH values were very similar in all samples (16–16.5 C, pH: 7.5–8.8)
except in the case of S12, where temperaturewas higher because it
comes from the ATAD digesters, which operate at 60 C. Regarding
dissolved oxygen, values were similar in water samples (6–8 mg/l)
but near zero in all sludge samples because of aerobic organic
matter decomposition.