Method for color removal from thermally conditioned sludge liquo

Details Method for color removal from thermally conditioned sludge liquo Method for color removal from thermally conditioned sludge liquo

1991-05-01

1991-12-24

Wyse, Thomas

Liquid purification or separation

Processes

Chemical treatment

210756, 210765, 210766, 210917, C02F 176

Patent

active

050750151

ABSTRACT:
A process for removing color and oxidizable organic matter from thermally conditioned sludge liquor is disclosed. The process comprises treating the liquor with 250 to 430 mg/l chlorine which removes 20 to 70 percent of the color and produces a chlorine residual in the liquor. The chlorine-treated liquor is mixed with a small volume of untreated thermal conditioning liquor to remove the chlorine residual, and the dechlorinated mixture is returned to the treatment plant influent for additional treatment.

REFERENCES:
patent: 3272739 (1968-09-01), Earle et al.
patent: 3272740 (1966-09-01), Gitchel et al.
patent: 3359200 (1967-12-01), Gitchel et al.
patent: 3824168 (1974-07-01), Erickson et al.
patent: 4609469 (1986-09-01), Keoteklian
patent: 4626354 (1986-12-01), Hoffman et al.
patent: 4983258 (1991-01-01), Maxham

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