Chemical detoxification of sewage sludge

Details Chemical detoxification of sewage sludge Chemical detoxification of sewage sludge

1981-07-10

1983-01-25

Castel, Benoit

Liquid purification or separation

Processes

Treatment by living organism

210613, 210614, 210901, 210912, 210919, 210746, C02F 1102, C02F 1112

Patent

active

043702333

ABSTRACT:
A method is disclosed for the chemical detoxification of anaerobically digested organic sludge containing toxic heavy metals in insoluble form. A quantity of the sludge is transferred from a conventional anaerobic digester to an insulated reactor vessel where the sludge is mixed and aerated at a rate sufficient to raise the oxidation reduction potential of the sludge to above +300 mv. and to maintain this condition for a period of 6-12 hours during which the heavy metals are converted to their desired oxidation state. The sludge is then acidified under controlled conditions to pH 1.0-3.0 for a period of 6-12 hours to solubilize the heavy metals. Conventional dewatering techniques are used to separate the detoxified, acidic sludge and the acidic, heavy-metal-containing water. The sludge may be neutralized for safe land application, and the metals can be recovered from the water using existing conventional techniques.

REFERENCES:
patent: 3649534 (1972-03-01), Schotte
patent: 3838198 (1974-09-01), Bellamy et al.
patent: 3864247 (1975-02-01), Fuchs
patent: 3892660 (1975-07-01), Romell
patent: 3961078 (1976-06-01), Stitt
patent: 4000064 (1976-12-01), Romell et al.
patent: 4159944 (1979-07-01), Erickson et al.
patent: 4277342 (1981-07-01), Hayes et al.

Affiliated with

Also associated with

Rating

Chemical detoxification of sewage sludge does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Chemical detoxification of sewage sludge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemical detoxification of sewage sludge will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1622973