Liquid purification or separation – Processes – Treatment by living organism
Patent
1988-07-20
1991-05-07
Silverman, Stanley
Liquid purification or separation
Processes
Treatment by living organism
210621, 210623, C02F 330
Patent
active
050134418
ABSTRACT:
An activated sludge sewage treatment process wherein sewage is received into a sewage treating basin in first zone into which activated sludge is mixed and retained for a period sufficient to form a non-bulking sludge and absorb biodegradable dissolved compounds into the activated sludge, and aerated and subjected to a quiescent condition to permit settling of the sludge in a zone characterized in that it has less than approximately twenty percent of the biochemical oxygen demand of the original sewage and where in the sludge is non-bulking, decanting treated sewage from the upper portion of the basin after allowing the sludge to settle, and cyclically repeating the process, anaerobically fermenting the influent sewage, and recycling anaerobically fermented partially treated sewage to the input of the influent sewage is disclosed.
REFERENCES:
patent: 3681236 (1972-08-01), Bergles et al.
patent: 4056465 (1977-11-01), Spector
patent: 4271026 (1981-06-01), Chen et al.
patent: 4479876 (1984-10-01), Fuchs
patent: 4655925 (1987-04-01), Tabata et al.
patent: 4663044 (1987-05-01), Goronszy
patent: 4867883 (1989-09-01), Daigger et al.
Hubbard Grant L.
Silverman Stanley
Upton Christopher
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