question_answer

What causes the spent slurry to overflow into the outflow tank in biogas plant?

A) Biomass decomposes in the digester chamber and expands, and the gas produced presses down the slurry.

B) Biomass decomposes in the mixing tank and expands  and the gas produced presses down the slurry.

C) The upper part of the digester has an outlet for gas.

D) All of these

E) None of these