Apparatus and method for denitrification of waste water

Details Apparatus and method for denitrification of waste water Apparatus and method for denitrification of waste water

1975-07-07

1976-11-30

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 11, 210 80, 210 82, 210195R, 210275, C02C 106

Patent

active

039948030

ABSTRACT:
Apparatus and method for periodic backwashing and inoculating with anaerobic denitrifying bacteria a columnar filter bed in a waste water treatment system. A minor portion of backwash water containing a substantial quantity of denitrifying bacteria is retained for return to the filter bed media by gravity flow after completion of the backwash cycle. The apparatus and method have particular utility in an activated sludge sewage treatment system the effluent from which contains nitrates (converted from organic nitrogen and ammonia) and suspended solids which are removed in a filter bed comprising several discrete layers of filter sand of different particle sizes supported on coarse gravel.

REFERENCES:
patent: 2888140 (1959-05-01), Hebert
patent: 3286842 (1966-11-01), De Jong
patent: 3709364 (1973-01-01), Savage
patent: 3713543 (1973-01-01), Heaney
patent: 3817378 (1974-06-01), Ross
patent: 3829377 (1974-08-01), Hashimoato

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