C - Chemistry – Metallurgy – 12 – N
Patent
C - Chemistry, Metallurgy
12
N
C12N 1/20 (2006.01) C02F 3/34 (2006.01) C02F 11/00 (2006.01) C02F 11/02 (2006.01) C22B 3/18 (2006.01)
Patent
CA 2104865
The present invention relates to a process for removing heavy metals and substantially destroying indicator bacteria pres- ent in municipal sludges, which comprises: lowering, under aerobic conditions, the pH of a municipal sludge from about 7 to 8 to about 2.0 to 2.5 by adding to said sludge 10 % by volume of an inoculum containing a mixture of microorganisms comprising Thi- obacillus thiooxidans ATCC X5127 and Thiobacillus thioparus ATCC 55128 with 1 to 3 g per litre of sulphur, and incubating for a period of at least 40 hours where the heavy metals originally present in said sludge have been substantially solubilized and the concentration of the indicator bacteria has been lowered to a non-toxic level; and recovering the metals from the low pH treated sludge of step a).
Couillard Denis
Jain Devender K.
Tyagi Rajeshwar D.
Goudreau Gage Dubuc
Institut National de La Recherche Scientifique
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