Process for biologically purifying sewage on a bed of granular m

Details Process for biologically purifying sewage on a bed of granular m Process for biologically purifying sewage on a bed of granular m

1987-09-25

1989-01-24

Castel, Benoit

Liquid purification or separation

Processes

Treatment by living organism

210618, 210150, C02F 330

Patent

active

048000213

ABSTRACT:
Water is purified according to the principle of a biomass fixed on an aerated granular bed acting as a filter in a biological reactor.
The water to be purified is sent, without presettling, upwardly through a multilayer granular bed placed in the reactor. The injection point of oxygenated gas determines two succesive zones, anaerobic and then aerobic. The water is evacuated from the reactor at the top thereof, or at a certain level of the bed. A sudden downward flushing of the filter with water is provided to eliminate the biomass. The filter is periodically washed with air/water and then rinsed with water.

REFERENCES:
patent: 3126333 (1964-03-01), Williams
patent: 3171802 (1965-03-01), Rice et al.
patent: 3968034 (1976-07-01), Tymoszczuk
patent: 4253947 (1981-03-01), Fan et al.
patent: 4521311 (1985-06-01), Fuchs et al.
patent: 4560479 (1985-12-01), Heijnen
patent: 4696747 (1987-09-01), Verstraete et al.

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