Reduction of the phosphate content in waste water from the prepa

Details Reduction of the phosphate content in waste water from the prepa Reduction of the phosphate content in waste water from the prepa

1993-09-27

1996-12-10

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210726, 210754, 210756, 210759, 210906, 549222, C02F 158

Patent

active

055827390

ABSTRACT:
A process for reducing the phosphate content in waste water from the preparation of salts of ascorbic acid 2-monophosphate comprises
A. treating the waste water from the crystallization of the metal salts of ascorbic acid 2-monophosphate with an alkali metal or alkaline earth metal hypochlorite, chlorine or H.sub.2 O.sub.2,
and
B. precipitating, at a pH of 9-12, the inorganic phosphate which has been produced from organically bound phosphorus and/or was present in the waste water, especially as calcium phosphate.

REFERENCES:
patent: 3361528 (1968-01-01), Shen
patent: 4179445 (1979-12-01), Sieb et al.
patent: 4399037 (1983-08-01), Diskowski et al.
patent: 4689154 (1987-08-01), Zimberg
patent: 4724262 (1988-02-01), Shimbo et al.
patent: 4999437 (1991-03-01), Dobler et al.
patent: 5110951 (1992-05-01), Ishimura et al.
patent: 5118817 (1992-06-01), Yoshida et al.
patent: 5149829 (1992-09-01), Seib et al.
patent: 5202445 (1993-04-01), Dobler et al.

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