Liquid purification or separation – Processes – Treatment by living organism
Patent
1983-02-23
1984-07-17
Castel, Benoit
Liquid purification or separation
Processes
Treatment by living organism
210608, 210612, 210625, 210630, 210631, 2101953, 2102211, 210906, C02F 330
Patent
active
044604700
ABSTRACT:
This invention relates to a process for the biological purification of phosphate-containing wastewater wherein the wastewater is gas-treated, i.e. aerated, in an oxygenation tank in the presence of activated sludge for degrading organic hydrocarbon compounds and absorption of phosphate by microorganisms present in the activated sludge. The wastewater-activated sludge mixture is then withdrawn from the oxygenated tank and divided, in a post clarification stage, into purified, essentially phosphate-free water and phosphate-containing sludge. The phosphate-containing sludge is recycled, at least in part, into the oxygenation tank. A partial stream of wastewater-activated sludge mixture is branched off from the oxygenation tank, and/or recycle sludge is branched off as a partial stream from the post clarification stage, and the mixture is subjected to flotation treatment for thickening. A thus-obtained, low-phosphate flotage, i.e. subnatant liquor, is discharged from the flotation unit. Likewise, resultant, phosphate-rich flotage sludge, i.e. thickened floating sludge, is discharged and heated, and after this heating, is treated anaerobically and mixed with wastewater to be purified. Subsequently, the wastewater-flotage sludge mixture is subjected to a phosphate separation and thus-produced, low-phosphate sludge is recycled into the oxygenation tank, and phosphate-enriched liquid is further treated.
REFERENCES:
patent: 3236766 (1966-02-01), Levin
patent: 4141822 (1979-02-01), Levin et al.
patent: 4183808 (1980-01-01), Ornevich
patent: 4267050 (1981-05-01), Conway et al.
patent: 4274959 (1981-06-01), Roediger
Castel Benoit
Linde Aktiengesellschaft
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