Filter device

Details Filter device Filter device

1993-02-25

1993-11-23

Wyse, Thomas

Liquid purification or separation

Processes

Treatment by living organism

210615, 210150, 435176, 435179, 435310, C02F 310, C02F 334

Patent

active

052641295

ABSTRACT:
A filter device for use in the treatment of water to render it potable, which is of particular value in emergency situations, comprises exo-polysaccharide producing, gram-negative bacteria supported upon a water-permeable material which is non-toxic to microorganisms and to human beings, is resistant to temperatures within the range from -15.degree. C. to +65.degree. C., and is not readily biodegradable. The device may be freeze-dried to enable it to be stored until it is required for use and may then be reactivated by the addition of water. It may be used as the surface layer in a slow-sand filter.

REFERENCES:
patent: 2071591 (1937-02-01), Tholin
patent: 3660278 (1972-05-01), Mimura et al.
patent: 3769164 (1973-10-01), Azarowicz
patent: 3843517 (1974-10-01), McKinney et al.
patent: 4029546 (1977-06-01), Brouillard
patent: 4055490 (1977-10-01), Hasegawa et al.
patent: 4427548 (1984-01-01), Quick, Jr.
patent: 4708792 (1987-11-01), Takarebe et al.
patent: 5096814 (1992-03-01), Aivasidis et al.

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