Abstract: A water treatment plant comprising a generally horizontal cylindrical tank and an upstanding cylindrical tank usually having a diameter less than the horizontal tank and being integrally attached to and intersecting an end wall portion thereof. The horizontal tank includes a transverse partition and a longitudinal partition which extends from an intermediate portion of the transverse partition to the upstanding tank and divides the first tank into an aeration chamber, a sludge holding chamber and a purifying or chlorine contact chamber. The second tank comprises a clarifying chamber including an upper portion having influent and effluent pipe means and skimming means and a bottom portion having a circular bottom surface, an outlet and scraper means for moving sediment into the outlet for recirculation either to the aeration chamber or to the sludge holding chamber.

Abstract: A water treatment plant including a cylindrical water storage tank provided with spaced opposite end walls with a longitudinal axis therebetween, a generally cylindrical pressure tank having a smaller diameter than the storage tank and provided with spaced curved end walls with a longitudinal axis therebetween, and an equipment chamber attached to one end wall of the storage tank wherein the end wall forms a common wall with the equipment chamber. One curved end wall of the pressure tank intersects and is rigidly connected to the common wall between the storage and pressure tanks. The longitudinal axis of the storage tank and pressure tank are parallel and generally coincident and spacer means rigidly connect the tanks.Water normally passes through an aerator prior to being deposited in the storage tank. From the storage tank the water passes through a series of interconnected pipes, is chlorinated and alternatively fed either to the pressure tank or to a discharge pipe.