公开(公告)号：US5217615A

公开(公告)日：1993-06-08

申请号：US659723

申请日：1991-02-25

Applicant: Rajeshwar D. Tyagi ,  Devender K. Jain ,  Denis Couillard

Inventor： Rajeshwar D. Tyagi ,  Devender K. Jain ,  Denis Couillard

IPC: C02F3/34 ,  C02F11/00 ,  C22B3/18

CPC classification number: C02F3/345 ,  C02F11/004 ,  C22B3/18 ,  Y02P10/234 ,  Y10S210/912 ,  Y10S435/832

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).

Abstract translation: 本发明涉及一种去除重金属并显着破坏城市污泥中存在的指示菌的方法，其包括：在需氧条件下，将市政污泥的pH从约7至约2.0至约2.0至2.5降低至所述 将含有含有硫氧化硫杆菌ATCC 55127和硫杆菌硫杆菌ATCC 55128的微生物混合物的接种物的10体积％与1至3克/升的硫混合，并将至少40小时的温度孵育至最初存在的重金属 所述污泥已基本溶解，指示剂细菌的浓度降低至无毒水平; 并从步骤a）的低pH处理污泥中回收金属。