A300-gallon anaerobic digester will be loaded daily with a feedstock that contains two parts dairy manure and one-part water by volume. the feedstock contains 6% volatile solids (vs) by weight and has a density of 37.5 lb/ft'. what volume of feedstock would be required each day to maintain an organic loading rate (olr) of 2.0 kg vs/m/day? what is the hydraulic retention time (hrt) in the anaerobic digester tank for a loading rate of 2.0 kg vs/m/day?

The volume of feedstock needed to mantain an organic load rate of 2 kgVS/day is 0.055 m3/day of feedstock.

The HRT is 20.6 days.

Explanation:

First, we calculate how many kg is 1 m3 of feedstock. We know the density, so we can calculate the mass:

If the VS are 6% in weight,

The volume per day needed to feed 2 kg of VS/day is:

The HRT depends on the volume of the tank and the flow. Its equation is

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