System for removing nutrients from wastewater

Details System for removing nutrients from wastewater System for removing nutrients from wastewater

1996-03-07

1997-03-18

Upton, Christopher

Liquid purification or separation

Processes

Treatment by living organism

210623, 210630, 210903, 210906, C02F 330

Patent

active

056119275

ABSTRACT:
A wastewater treatment system mixes return activated sludge with influent wastewater under anoxic conditions in the presence of luxury uptake organisms to cause release of phosphorous compounds into the surrounding wastewater. The wastewater is then aerated in the presence of nitrifying organisms to convert ammonia into nitrate while the luxury uptake organisms take up the phosphorous compounds. The wastewater is next subjected to alternating anoxic and oxic conditions to reduce the nitrate to nitrogen gas using denitrifying organisms. The resulting effluent is substantially free of nitrogen-based phosphorous-based nutrients.

REFERENCES:
patent: 4655925 (1987-04-01), Tabata et al.
patent: 5037795 (1991-07-01), Schmid
patent: 5076928 (1991-12-01), Ballnus
patent: 5137636 (1992-08-01), Bundgaard
patent: 5196111 (1993-03-01), Nicol et al.
patent: 5536407 (1996-07-01), Petersen

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