This is inline
with the report of Alkan-Ozkaynak and Karthikayan (2011) where
the highest biogas yields were observed at pH 8. The observed increase in pH could have contributed to the reduction in pathogens
in the biofertilizer digestate as most pathogens cannot tolerate
high pH levels. Yun et al. (2000) have also reported that a large
amount pathogen is destroyed by the metabolic heat generated
by microorganisms during anaerobic digestion.