VERTICAL SHAFT BIOREACTOR WITH A DIVIDED HEAD TANK

摘要

A multi-channel vertical shaft bioreactor having a downcomer; a riser operatively in communication with the downcomer to form a loop; an off-gas head tank; a part of the loop being through the head tank; a de-gassing plat e around which effluent liquor is degassed to produce a de-gassed liquor and a n off-gas receivable by the head tank; oxygen containing gas injection means f or injecting gas into the riser; liquid influent injection means to inject influent into the riser; means to extract liquid effluent from the bioreacto r; the improvement comprising one or more vertical baffle plates disposed withi n an upper part of the head tank to define a plurality of off-gas receiving chambers; a plurality of biofilters, a plurality of off-gas conduits in communication with the chambers and the biofilters to operably allow passage of off-gas from the chambers to the biofilters to effect off-gas aeration in the biofilters; and conduit off-gas controls for the treatment of waste wate r. Each of the multiple gas confinement compartments in the single head tank ca n operate at different pressures and enable each of the biofilters to be independently back-washed.