VORRICHTUNG FÜR DIE ABWASSERBEHANDLUNG.

摘要

Waste water treatment plant of the type in which liquid and solid components of waste water are first separated by settlement, biomass in the waste water is then subjected to digestion by microorganisms supported on rotary contactors (29, 30) which periodically expose the biomass to air, and finally the waste water undergoes a second settlement to separate remaining solids. The plant comprises a plurality of rotary contactor units (29, 30), each accommodated in a biozone tank (22, 24, 26) arranged in a row above respective primary settlement tanks (12, 14, 16). The axes of rotation of the units are transverse to the row of tanks, and each unit has its own individually controllable drive. A sludge storage tank is provided to receive settled sludge from the primary settlement tanks (12, 14, 16), the tank being divided into compartments (38, 40, 42), one per primary settlement tank. Pumps (44) are provided to transfer sludge from the primary settlement tanks (12, 14, 16) to the storage tank. The floors of the settlement tanks and sludge tanks are benched to localise the sludge for easy removal.