Hybrid chemical and biological process for decontaminating...

Details Hybrid chemical and biological process for decontaminating... Hybrid chemical and biological process for decontaminating...

2005-02-15

2005-02-15

Barry, Chester T. (Department: 1724)

Liquid purification or separation

Processes

Treatment by living organism

C210S631000, C210S702000, C210S760000, C210S759000, C210S758000, C210S754000

Reexamination Certificate

active

06855256

ABSTRACT:
The invention relates to a hybrid biological and chemical method for decontaminating sludge containing heavy metals and pathogenic microorganisms, consisting of the following steps: the sludge is mixed with an acidic leaching solution in order to acidify the sludge with a pH which is low enough to solubilize the majority of the heavy metals and to destroy most of the pathogenic microorganisms but which is also high enough to minimize the solubilization of fertilizing elements; oxidation-reduction of more than +400 mv is maintained, liquid-solid separation occurs in order to obtain a solid fraction comprising decontaminated acidic sludge and a liquid fraction comprising heavy metals which are dissolved in a leaching solution; the sludge is neutralized: and neturalized decontaminated sludge is recovered, whereby the fertilizing elements contained therein, i.e. carbon, nitrogen and phosphorus, remain substantially unchanged in relation to the initially contaminated sludge.

REFERENCES:
patent: 4277342 (1981-07-01), Hayes et al.
patent: 4370233 (1983-01-01), Hayes et al.
patent: 4814091 (1989-03-01), Napier et al.
patent: 5051191 (1991-09-01), Rasmussen et al.
patent: 198 02 238 (1999-07-01), None

Affiliated with

Also associated with

Rating

Hybrid chemical and biological process for decontaminating... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hybrid chemical and biological process for decontaminating..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hybrid chemical and biological process for decontaminating... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3493272