Is 7.5 the optimal pH for microorganisms in the biological tanks used for treating wastewater?
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=== Is 7.5 the optimal pH for microorganisms in the biological tanks used for treating wastewater? Are there microorganisms that are specifically adapted to living in alkaline or acidic environments? ==
It’s not possible for all bacteria to have 7.5 as the optimal pH for growth; what’s sought is an environment in which the desired dominant species can reproduce and carry out metabolic activities effectively within a certain pH range
The environmental conditions to which different microorganisms are adapted must vary. Yeast prefers slightly acidic conditions.
The life activities and metabolic processes of microorganisms are closely related to pH value. Most microorganisms can adapt to a pH range of 4.5–9, with the optimal pH range being 6.5–7.5. When the pH is below 6.5, fungi begin to compete with bacteria; at a pH of 4.5, fungi gain complete dominance in the biochemical tank, which severely affects the sedimentation of sludge ； When the pH exceeds 9, the metabolic rate of microorganisms is hindered. Different microorganisms have varying requirements for their optimal pH range. In aerobic biological treatment, the pH can vary between 6.5 and 8.5 ； In anaerobic biological treatment, microorganisms have strict requirements regarding pH, which should be between 6.7 and 7.4.