Method of improving the backwashing of fixed beds formed of gran

Details Method of improving the backwashing of fixed beds formed of gran Method of improving the backwashing of fixed beds formed of gran

1977-02-25

1978-09-12

Wyse, Thomas G.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 63R, 210 80, C02C 104, B01D 3700

Patent

active

041136128

ABSTRACT:
A method of improving the backwashing of fixed beds formed of granular materials and used during waste water purification or water treatment, wherein the fixed bed, during the course of the backwashing thereof, is maintained during a predetermined time duration filled with a quiescent liquid. This liquid contains at least one substance which is distributed as uniformly as possible therein. In the presence of a spontaneous, catalytically triggered decomposition reaction, this substance releases a gaseous component. Then, the fixed bed is backwashed with water.

REFERENCES:
patent: 1966279 (1934-07-01), Behrman
patent: 2105835 (1938-01-01), Krause
patent: 3282702 (1966-11-01), Schreiner
patent: 3705098 (1972-12-01), Shepherd et al.
patent: 3932278 (1976-01-01), Meidl et al.

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