M

2 = Volume of secondary digester(s), ft3 t1, t2 = Detention time in primary and secondary digesters, days

MTm2 = Mean solids concentration in secondary digesters, %

The following equation calculates digester diameters:

2 = Volume of secondary digester(s), ft3 t1, t2 = Detention time in primary and secondary digesters, days

MTm2 = Mean solids concentration in secondary digesters, %

The following equation calculates digester diameters:

where:

V = Total volume required, ft3 n = Number of digesters n = 3.1416

h = Mean liquid depth, ft where:

V = Total volume required, ft3 n = Number of digesters n = 3.1416

h = Mean liquid depth, ft

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