Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1975-04-09
1976-06-22
Wyse, Thomas G.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 8, 210 16, 210DIG27, C02C 106
Patent
active
039649989
ABSTRACT:
A process for removing nitrogen from raw or settled sewage, comprising passing the sewage through a first stage in the form of an anoxic biological denitrification stage, through a second stage in the form of an aerated biological nitrification stage, through a third stage in the form of an anoxic biological denitrification stage, through a fourth stage in the form of an aeration stage to facilitate solids separation, through a solids separation stage to provide a clarified effluent and an active sludge, of recycling mixed liquor from the second stage to the first stage and of recycling at least portion of the active sludge to the first stage. The process adapted for the additional removal of phosphates by regularly wasting sludge, by aerating the fourth stage to maintain a dissolved oxygen concentration of at least 4 mg/l, and by controlling th sludge recycle rate to limit the sludge retention time in the solids separation stage. Apparatus for carrying out the process comprising apparatus stages which correspond to the process stages, and feed means for feeding mixed liquor between the stages, mixed liquor recycling means and active sludge recycling means.
REFERENCES:
patent: 2348126 (1944-05-01), Green
patent: 2419492 (1947-04-01), Green
patent: 2436584 (1948-02-01), Logan
patent: 2529295 (1950-11-01), Hood
patent: 3579439 (1971-05-01), Meiring et al.
patent: 3617540 (1971-11-01), Bishop et al.
patent: 3654147 (1972-04-01), Levin et al.
patent: 3709364 (1973-01-01), Savage
patent: 3764523 (1973-10-01), Stankewich
patent: 3817857 (1974-06-01), Torpey
patent: 3900394 (1975-08-01), Rongred
The South African Inventions Development Corporation
Wyse Thomas G.
LandOfFree
Improvements in and relating to waste water treatment does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Improvements in and relating to waste water treatment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improvements in and relating to waste water treatment will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2286440