Liquid purification or separation – Processes – Treatment by living organism
Patent
1984-12-03
1985-12-03
Therkorn, Ernest G.
Liquid purification or separation
Processes
Treatment by living organism
210614, 210626, 210709, 210718, 210744, 210903, C02F 312
Patent
active
045564914
ABSTRACT:
The problem of rising sludge in biological wastewater treatment secondary clarifiers is overcome by minimizing entrainment of nitrogen gas with mixed liquor entering the transfer pipe to the clarifier such that the level of dissolved nitrogen in the biomass settling in the clarifier remains less than that in equilibrium with nitrogen gas at the pressure prevailing in the biomass. This invention is most efficacious in cases where soluble oxides of nitrogen are present and are reduced by the biomass to elemental nitrogen. In accordance with one described embodiment the excess nitrogen is removed by degassing of the mixed liquor in the effluent pit of the system by deepening and widening the usual pit in such manner that the rate of descent of mixed liquor therein to a discharge outlet is less than 0.4 feet per second and the depth is greater than 4 feet, thus permitting the gas-containing macrobubbles to rise to the surface of the pit where these are degassed. The mixed liquor thus freed of macrobubbles is then passed through a hydraulic pressure zone enroute to the clarifier in which pressure zone the nuclei microbubbles are caused to dissolve.
REFERENCES:
patent: 1202474 (1916-10-01), Bolton
patent: 2065123 (1936-12-01), Downes
patent: 2780360 (1957-02-01), Bon
patent: 3617579 (1971-11-01), Gunderloy
patent: 3623976 (1971-11-01), Cessna
patent: 3730883 (1973-05-01), Lefrancois
patent: 3824185 (1974-07-01), Caldwell
patent: 3892659 (1975-07-01), Kirk
patent: 4056465 (1977-11-01), Spector
patent: 4183810 (1980-01-01), Boenens
patent: 4216089 (1980-08-01), Boon
patent: 4315823 (1982-02-01), Witt
Power Special Report, Waste-Water Treatment, R. H. Marks, Jun. 1967.
Hong Sun-nan
Seebohm Robert P.
Spector Marshall L.
Air Products and Chemicals Inc.
Innis E. Eugene
Rodgers Mark L.
Simmons James C.
Therkorn Ernest G.
LandOfFree
Avoidance of rising sludge in biological wastewater treatment cl does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Avoidance of rising sludge in biological wastewater treatment cl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Avoidance of rising sludge in biological wastewater treatment cl will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1393552