Liquid purification or separation – Flow – fluid pressure or material level – responsive – Float
Patent
1988-07-29
1989-04-18
Hart, Charles
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Float
137118, 210151, B01D 3500
Patent
active
048224855
ABSTRACT:
A recirculating sand filter system for the treatment of waste water comprises a septic tank (10) for receiving waste water, a recirculating pump tank (18) connected to the septic tank for receiving effluent from the septic tank and one or more sand filter modules (12, 14). The recirculating pump tank has a pump (48) connected to a pump outlet line (32) connected to the sand filter modules. A distribution pipe (28) connected to the pump outlet line is positioned to spray water over a surface of the sand filters. The pump is controlled by a timer (74) to periodically pump water to dose the sand filters. The sand filters have one or more collection pipes (34, 36) at the bottom of the filter for collecting filtrate and returning the filtrate to the recirculating pump tank via a return line (42) by gravity feed. A recirculating valve (52) in the recirculating pump tank is connected between the return line and a discharge line exiting the recirculating pump tank. The recirculating valve comprises a T-pipe (54) consisting of a horizontal straight section and a downwardly directed branching arm (66) having a large radius curvature allowing for smooth, nonturbulent flow. A float valve is connected to the branching arm for blocking the flow of water into the circulating pump tank when a level of water in the tank exceeds a predetermined maximum level.
REFERENCES:
patent: 2604110 (1952-07-01), Gilder
patent: 2807275 (1957-09-01), Steidley
patent: 3496261 (1970-02-01), Parr
patent: 3679053 (1972-07-01), Koulovatos et al.
patent: 3804253 (1974-04-01), Wellman et al.
patent: 4005726 (1977-02-01), Fowler
patent: 4011162 (1977-03-01), Oldham et al.
patent: 4120331 (1978-10-01), Kvivanek
Hart Charles
Whitham C. Lamont
Whitham Michael E.
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