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What is the solid retention time assumed when the sludge constituting biosolids is treated anaerobically?

What is the solid retention time assumed when the sludge constituting biosolids is treated anaerobically? Correct Answer 15 days

The sludge constituting biosolids can be treated anaerobically also. While carrying out anaerobic treatment, the solid retention time assumed is 15 days. The temperature is maintained at 15-20 degree celsius.

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In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres; ρ = apparent solid density, kg/m3; L = flow rate of dry solids, kg/see.m2 drier cross-section; H = hold up of solid.)