Low Temperature Aerobic Digestion

Aerobic digesters in small package-type wastewater treatment plants have been studied to provide better operational control at temperatures lower than 20°C. Investigations at treatment plants in British Columbia, Canada have indicated that the SRT must be increased as operating temperatures decrease to ensure acceptable volatile solids reductions (Koers and Mavinic, 1977; Mavinic and Koers, 1979). At temperatures between 5 and 20°C, the system should operate at 250 to 300 degree-days (product of SRT in days and operating temperature in °C) to maintain an acceptable level of volatile solids reduction. Heated air or wastewater can be used to decrease detention time and to prevent freezing of digesters.

Organic Gardeners Composting

Organic Gardeners Composting

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