Process for completing circulatory systems used to purify water

Details Process for completing circulatory systems used to purify water Process for completing circulatory systems used to purify water

1986-03-05

1988-01-05

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

55 55, 55 68, 55 73, 210705, 210712, 210718, 210724, 210748, 210772, 210906, 210912, 423235, C02F 152, C02F 120

Patent

active

047174846

ABSTRACT:
Water or sewage which contains sludges containing organic waste materials or waste materials which can be chemically precipitated are mixed with a flocculant consisting of a metal salt solution and are subsequently degasified. Thereafter, the pure water and organic sludge containing admixed metal hydroxide are separated from each other. The pH value of the sludge mixture is decreased until the metal hydroxides are dissolved as metal salts so that the organic sludge can be separated from the resulting metal salt solution. The metal salt solution is recirculated for re-use as a flocculant. Because the separated sludge still contains metal salts, it is treated with wash water and may possibly be further acidified. After the separation, the pH value of the wash water is increased to precipitate a metal hydroxide sludge, which is separated from the wash water and recycled to the degasified sewage.

REFERENCES:
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patent: 3828525 (1974-08-01), Copa et al.
patent: 4140651 (1979-02-01), Burnell et al.
patent: 4343706 (1982-08-01), Etzel et al.
patent: 4350597 (1982-09-01), Selm et al.
patent: 4566975 (1986-01-01), Allgulin
Mellor, Inorganic & Theoretical Chemistry, vol. X, 1947, p. 173.
Pp. 4 and 5 of English translation of German Priority Appln. P 35 07 839.1.

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