Liquid purification or separation – Processes – Treatment by living organism
Patent
1984-01-19
1985-02-19
Wyse, Thomas
Liquid purification or separation
Processes
Treatment by living organism
210625, 210630, 210903, 210906, C02F 308
Patent
active
045004293
ABSTRACT:
A process and apparatus are provided for the biological purification of phosphate-containing wastewater, wherein the wastewater is treated, in the presence of activated sludge at least a portion of which is fixed on a carrier material. The process is conducted in at least one aerobic, an anaerobic, and optionally an anoxic zone, to thereby discharge a substantially phosphate-free wastewater stream. In order to attain a high purifying effect with low cost expenditure, the activated sludge is carried on a movable carrier. The carrier material is conveyed from the anaerobic zone, optionally through the anoxic zone, to the aerobic zone, and simultaneously a like amount of carrier material is returned from the aerobic zone, optionally through the anoxic zone, to the anaerobic zone. In this process, the activated sludge is enriched with phosphates, and a portion of the phosphate-enriched activated sludge is separated from the discharged effluent.
REFERENCES:
patent: 4026802 (1977-05-01), Akae
patent: 4055490 (1977-10-01), Hasegawa et al.
patent: 4167479 (1979-09-01), Besik
patent: 4279753 (1981-07-01), Nielson et al.
patent: 4415454 (1983-11-01), Fuchs
Frydman Allen
Fuchs Uwe
Reimann Hans
Linde Aktiengesellschaft
Wyse Thomas
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