Phosphorus treatment process

Details Phosphorus treatment process Phosphorus treatment process

1987-04-17

1988-01-26

Wyse, Tom

Liquid purification or separation

Processes

Treatment by living organism

210622, 210630, 210903, C02F 330

Patent

active

047215690

ABSTRACT:
A process is disclosed for decreasing the phosphorus content of an aqueous influent stream containing biodegradable substrates, comprising adding to said stream previous aerobically enhanced and anaerobically stressed bacteria; dividing said stream into separate first and second streams; treating the first stream in an aerobic zone, in the presence of sufficient oxygen, for a time sufficient to cause enhancement of the bacteria to take-up phosphorus in excess of their growth requirements; treating the second stream in an anaerobic zone containing less than about 1 ppm of oxygen, for a time sufficient to stress the bacteria and cause release of phosphorus which is nonessential for the bacteria growth requirements; intimately mixing said treated first and second stream; holding said mixed first and second streams to allow settling of precipitants; removing liquid effluent from the upper portion of the settled stream; removing high solids content sludge, containing bacteria and phosphorus from the lower portion of the settled stream; and, recycling a portion of sludge containing bacteria to the aqueous influent stream. Such process acts to synergistically increase the efficiency of phosphorus removal, without addition of costly chemicals, by significantly increasing the amount of phosphorus taken-up by bacteria.

REFERENCES:
patent: 4279753 (1981-07-01), Nielson et al.
patent: 4431543 (1984-02-01), Matsuo et al.
patent: 4460470 (1984-07-01), Reimann
patent: 4488968 (1984-12-01), Hong et al.
patent: 4522722 (1985-06-01), Nicholas
patent: 4559142 (1985-12-01), Morper

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