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The objective of this research was to establish the correlation between inactivation of fecal coliforms in batch acid-digesters and semi-continuously fed acid-digesters at both mesophilic (38°C) and low-mesophilic (24°C) temperatures caused by organic acids in their un-ionized
form. Batch acid digesters achieved Class A level of fecal coliforms within 6 to 7 days of digestion at both temperatures. Semi-continuously fed, staged acid digestion systems achieved Class A standard only at mesophilic temperature at SRT of 11 days. Systems operated at low-mesophilic temperature
did not achieve Class A. It was attributed to lower diffusion rates most probably caused by lower vapour pressure of organic acids at lower temperatures.
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