BIOLOGICAL SEWAGE TREATMENT APPARATUS

摘要

The disclosed apparatus includes an elongated semicylindrical trough closed at its ends and divided lengthwise into a series of neighbouring compartments, each partially accomodating a group of biological organism support members having axially or radially extending paddles or fins and co-rotatable with each other on a common shaft extending lengthwise of the trough; said trough being installed into the upper regions of a sewage settlement tank so that its bottom is spaced above the bottom of the settlement tank and its top is located slightly above the anticipated level of the sewage in the tank; a sewage inlet into the tank being provided at one corner thereof near the top of the tank and an inlet weir into the trough being provided into the top of the first compartment at one end of the trough diagonally opposite the location of sewage inlet into the tank so that sewage entering the tank through said inlet is required to flow diagonally across the tank and under the trough into said first compartment through said inlet weir, said first compartment having also slotting in its bottom; other weirs being provided in the tops of the partitions separating the compartments to establish a meandering path for said liquid flowing from said first compartment to the last through the intervening compartments; a discharge outlet being provided from said last compartment into an adjacent final settlement tank incorporating a chemical treatment zone.