Filtering apparatus having positively buoyant and negatively buo

Details Filtering apparatus having positively buoyant and negatively buo Filtering apparatus having positively buoyant and negatively buo

1996-06-13

1998-03-03

Silverman, Stanley S.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Filter cleaning

210138, 210169, 210275, 210290, 2104162, A01K 6304, C02F 306

Patent

active

057230439

ABSTRACT:
A filtration system having a volume of positively buoyant particulate material and a volume of negatively buoyant particulate material. The system includes a vessel having an upper port, a lower port and an intermediate drain port. As contaminated liquid travels between the upper and lower ports, it is filtered through both volumes of particulate material. The system may be operated with the liquid flowing in either direction between the upper and lower ports. To clean the system, the drain port is opened and cleaning liquid is pumped into the upper port and/or the lower port and flushed out the drain port. An alternate embodiment of the filtration system includes a vessel, two tubular members, a volume of positively buoyant particulate and a volume of negatively buoyant material. The two tubular members extend into the vessel and have slotted areas for travel of liquid into and out of the tubular members. A check valve, a motorized slide valve and a backwash controller are provided to automatically reverse flow through the vessel.

REFERENCES:
patent: 1737202 (1929-11-01), Runnels
patent: 3471025 (1969-10-01), Dobson
patent: 3616915 (1971-11-01), Whitlock
patent: 3814245 (1974-06-01), Hirs
patent: 3814247 (1974-06-01), Hirs
patent: 3956128 (1976-05-01), Turner
patent: 4246119 (1981-01-01), Alldredge
patent: 4322296 (1982-03-01), Fan et al.
patent: 4519917 (1985-05-01), Martinola
patent: 4806236 (1989-02-01), McCormack
patent: 5453183 (1995-09-01), Hoffa

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