Waste water treating apparatus

Details Waste water treating apparatus Waste water treating apparatus

1981-08-27

1984-01-10

Castel, Benoit

Liquid purification or separation

Constituent mixture variation responsive

210605, 210614, 210629, 210170, 2101953, 210199, 210205, 210746, 210903, 210218, C02F 330

Patent

active

044252315

ABSTRACT:
A waste water treating apparatus includes a circulation type aeration tank having a downward flow chamber and an upward flow chamber extending in the depth direction and communicating with each other at the upper and lower ends thereof. An oxygen containing gas is supplied to the downward flow chamber and waste water and return sludge are supplied to a given position or elevation of the upward flow chamber to be mixed with a mixed liquor flowing through the upward flow chamber, whereby a reduction zone with a low concentration of dissolved oxygen is formed at the upper portion of the upward flow chamber. Denitrification takes place in the above described reduction zone.

REFERENCES:
patent: 3900394 (1975-08-01), Rongved
patent: 4026802 (1977-05-01), Akae
patent: 4159243 (1979-06-01), Okey
patent: 4183810 (1980-01-01), Baenens et al.
patent: 4278546 (1981-07-01), Roesler
patent: 4340484 (1982-07-01), Pollock et al.

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