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US 4,051,032 AGranted
Water treatment system
AssigneeEnvironmental Filtration Products, Inc.
InventorJack A. Borchardt
Life of this patent
Estimating the term…
Abstract
A water and wastewater treatment apparatus including a tank divided into a horizontal series of filtering subchambers by parallel, perforated septa. Effluent flows through the septa and through a reverse-graded media series including at least one fine medium such as sand. The media may be backwashed by counterflow and right angle flow, the latter being effective to expand and scrub one or more of the layers of media.
Claims16
A waste effluent tratment system comprising:
- means defining a closed chamber having an inlet at one end and an outlet at another laterally opposite end;
- a plurality of perforate septa substantially vertically disposed in spaced relation within said chamber between the inlet and outlet to divide same into subchambers through which an effluent flow path extends;
- a particulate filtering medium in at least one of said subchambers;
- backwash means for directing a backwash flow reversely to said effluent flow through at least one of said subchambers and, additional backwashing means for backwashing said medium at right angles to the flow path.
1 more element
A waste effluent treatment system comprising:
- a closed tank having an effluent inlet at one end and an effluent outlet at an opposite end to provide an effluent flow path substantially horizontally through the tank;
- a plurality of septa disposed in spaced relation within the tank to subdivide the tank into subchambers serially along the effluent flow path;
- a fine particulate medium in at least one of the subchambers to filter the effluent;
- a coarse particulate medium in another subchamber and upstream in the effluent flow from said one subchamber;
- first means for horizontally backwashing at least the coarse medium;
- and second means for vertically backwashing and expanding the fine medium in said one subchamber.
3 more elements
Dependencies are inferred from the claim text.