公开(公告)号：US5454948A

公开(公告)日：1995-10-03

申请号：US109988

申请日：1993-08-23

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

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

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

CPC分类号： C02F3/345 ,  C22B3/18 ,  Y02P10/234 ,  Y10S210/912

摘要： 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.

摘要翻译： 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。