Filter medium

Details Filter medium Filter medium

1986-04-21

1987-11-24

Castel, Benoit

Liquid purification or separation

With gas-liquid surface contact means

210505, 210508, C02F 304

Patent

active

047087927

ABSTRACT:
A filter medium comprising first and second filter mediums joined together. The first filter medium provides relatively large voids and has high porosity, while the second filter medium provides relatively small voids and has low porosity. Raw water is mainly introduced into the first filter medium, and water branching therefrom flows through the second filter medium, at which biological filtering is conducted by aerobic microorganisms breeding therein.

REFERENCES:
patent: 3347381 (1967-10-01), Minch et al.
patent: 4165281 (1979-08-01), Kuriyama et al.
patent: 4451362 (1984-05-01), Spelsberg
patent: 4461708 (1984-07-01), Hakulinen et al.

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