The function of sludge mixers is to mix and circulate the sludge content of the digesters in order to keep the solids in suspension in the liquid. Draft tube sludge mixers are installed to ensure homogeneous sludge mixing inside digesters.
Each unit is composed of two items - the mixing device and the draft tube.
Sludge circulation is achieved either by means of direct biogas injection, or by an agitator fitted with an impeller.
In both cases the sludge is pumped through the draft tube from the bottom upwards, and recirculated into the digester.
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