Treating of waste water with bauxite to remove phosphates from t

Details Treating of waste water with bauxite to remove phosphates from t Treating of waste water with bauxite to remove phosphates from t

1992-03-10

1993-12-21

Silverman, Stanley S.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210906, 423122, 423315, C02F 158

Patent

active

052718484

ABSTRACT:
Bauxite mineral is used directly, to remove phosphates from water, in a high efficiency, highly economical system. The process of the invention involves the step of contacting the waste water stream with Bauxite for a time sufficient to lower the phosphate concentration to a predetermined lower level. The predetermined lower level is typically less than about 2 mg/l of water, and can be to a concentration of less than 1 mg/l. The Bauxite has an average particle size of greater than about 50 mesh. Advantageously, the particle size is at least about one quarter of an inch.
The Bauxite which is used can be washed and graded to produce Bauxite having a particle size on the order of about one quarter of an inch. The Bauxite can be ground to an average particle size of at least about 50 mesh to produce a material having a higher reaction rate.
In one embodiment the waste water flows downwardly through the bed of Bauxite to produce a treated waste water stream having a phosphate concentration less than about 2 mg/l of waste water. The treated waste water is then collected in a settling tank for a time sufficient for precipitated particles to settle out. In another embodiment, the waste water can be subjected to a horizontal flow or upward flow through a Bauxite bed.

REFERENCES:
patent: 3499837 (1970-03-01), Jaunarjs
patent: 3595785 (1971-07-01), Bruce et al.
patent: 4167479 (1979-09-01), Besik
patent: 4184947 (1980-01-01), Demisch
patent: 4826601 (1989-05-01), Spratt et al.

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