Bacterial leaching process and composition

Details Bacterial leaching process and composition Bacterial leaching process and composition

1991-02-25

1993-06-08

Wyse, Thomas

Liquid purification or separation

Processes

Treatment by living organism

210631, 210912, 4352524, 435832, C02F 334, C02F 1100, C22B 300

Patent

active

052176150

ABSTRACT:
The present invention relates to a process for removing heavy metals and substantially destroying indicator bacteria present 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 Thiobacillus thiooxidans ATCC 55127 and Thiobacillus thioparus ATCC 55128 with 1 to 3 g per liter 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 have been lowered to a non-toxic level; and recovering the metals from the low pH treated sludge of step a).

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Hayes et al, Heavy Metal Removal From Sludges Using Combined Biological/Chemical Treatment, Department of Agricultural Engineering, Cornell University, Ithica, NY 14853 1980, Proc. 34th Ind. Waste Conference, Purdue University, pp. 529-543.
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