公开(公告)号：US5454948A

公开(公告)日：1995-10-03

申请号：US109988

申请日：1993-08-23

Applicant: Rajeshwar D. Tyagi ,  Jean-Francois Blais ,  Jean C. Auclair

Inventor： Rajeshwar D. Tyagi ,  Jean-Francois Blais ,  Jean C. Auclair

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

CPC classification number: C02F3/345 ,  C22B3/18 ,  Y02P10/234 ,  Y10S210/912

Abstract: The present invention relates to a semi-continuous process for removing heavy metals, substantially reducing volatile suspended solids and substantially destroying indicator bacteria from municipal sludges, which comprises: a) adding 1 to 3 g of sulphur per liter to a volume of municipal sludge and allowing the sulphur oxidizing thiobacilli initially present in said sludge to proliferate under aerobic conditions in said sludge being agitated until the pH of said sludge is lowered to about 1.5 to 2.5 which causes heavy metals present in said sludge to be substantially solubilized, the concentration of volatile suspended solids is substantially reduced and the concentration of indicator bacteria to be lowered to a non-toxic level; b) removing about 90% of said low pH sludge and recovering the solubilized heavy metals therefrom; c) adding about 90% of municipal sludge to the remaining low pH sludge of step b), thereby resulting in a sludge mixture having a pH of about 7 to 8; and d) repeating steps a) to c); whereby the thiobacilli are adapted when the time required for lowering the pH of the sludge to 1.5 to 2.5 is about the same in two successive operations.

Abstract translation: 本发明涉及一种用于去除重金属，基本上减少挥发性悬浮固体并基本上破坏来自市政污泥的指示剂细菌的半连续方法，其包括：a）每升将1至3g硫加入一定量的城市污泥中， 允许最初存在于所述污泥中的硫氧化硫杆菌在需氧条件下在所述污泥中搅拌，直到所述污泥的pH降低至约1.5至2.5，这导致所述污泥中存在的重金属基本上溶解，挥发物的浓度 悬浮固体显着减少，指示剂细菌的浓度降至无毒水平; b）去除约90％的所述低pH污泥并从其中回收溶解的重金属; c）向步骤b）的剩余低pH污泥中加入约90％的市政污泥，从而导致pH为约7至8的污泥混合物; 和d）重复步骤a）至c）; 从而当将两个连续的操作中将污泥的pH降低至1.5至2.5所需的时间大致相同时，硫杆菌适应。

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。

公开(公告)号：US06855256B2

公开(公告)日：2005-02-15

申请号：US10060277

申请日：2002-02-01

Applicant: Jean-Francois Blais ,  Nathalie Meunier ,  Jean-Louis Sasseville ,  Rajeshwar D. Tyagi ,  Guy Mercier ,  Fatima Hammy

Inventor： Jean-Francois Blais ,  Nathalie Meunier ,  Jean-Louis Sasseville ,  Rajeshwar D. Tyagi ,  Guy Mercier ,  Fatima Hammy

IPC: C12N1/20 ,  C02F1/52 ,  C02F1/66 ,  C02F1/72 ,  C02F1/78 ,  C02F3/34 ,  C02F9/00 ,  C02F11/00 ,  C02F11/06 ,  C02F11/14 ,  C02F3/00

CPC classification number: C02F3/345 ,  C02F1/52 ,  C02F1/66 ,  C02F1/72 ,  C02F1/722 ,  C02F1/78 ,  C02F9/00 ,  C02F11/004 ,  C02F2101/20 ,  C02F2303/04

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.

Abstract translation: 本发明涉及一种用于净化含有重金属和病原微生物的污泥的混合生物和化学方法，包括以下步骤：将污泥与酸性浸出溶液混合，以便将pH值低至足以溶解的污泥酸化 大多数重金属并破坏大多数病原微生物，但也足够高以使施肥元素溶解最小化; 维持大于+ 400mv的氧化还原，发生液固分离，以获得包含净化的酸性污泥的固体馏分和包含溶解在浸出溶液中的重金属的液体馏分; 污泥被中和，并且回收净化的去污污泥，由此其中所含的施肥元素即碳，氮和磷相对于最初被污染的污泥基本上保持不变。