Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1974-01-31
1979-07-03
Castel, Benoit
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 16, 210 17, 210DIG28, C02C 106
Patent
active
041599454
ABSTRACT:
A method for denitrification of aqueous nitrate-containing solutions is disclosed. Specifically the invention provides for denitrification of the effluent from an activated sludge sewage treatment process. Effluent from the settling zone of an activated sludge sewage treatment process containing nitrogen compounds such as nitrates and nitrites, is passed through a deep bed filter, the filter media of which has been innoculated with bacteria that converts the nitrogen compounds to nitrogen gas. The filter, in addition to removing the nitrogen compounds, also removes suspended solids from the settling zone effluent, so that the final effluent from the filter is concurrently clarified and denitrified. By controlling the backwash of the filter, bacteria is retained thereon so as to enable continuous use of the filter for denitrification.
REFERENCES:
patent: 3617539 (1971-11-01), Grutsch
patent: 3617540 (1971-11-01), Bishop et al.
patent: 3713543 (1973-01-01), Heaney
St. Amant et al., "Treatment of High Nitrate Waters", J.A.W.W.A., Dec. 1969, vol. 61, pp. 659-662 (P.O.S.L.).
Requa et al., "Kinetics of Packed Bed Denitrification", J. W.P.C.F., vol. 45, No. 8, pp. 1696-1707 (8/8/1973).
English et al., "Removal of Organics from Wastewater by Activated Carbon", Ch. Eng. Symp. Series Number 107, vol. 67, pp. 147-153 (1971).
Castel Benoit
Dravco Corporation
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