公开(公告)号：EP1421034A2

公开(公告)日：2004-05-26

申请号：EP02764557.1

申请日：2002-08-27

申请人： Diering, Bernd ,  Diering, Andreas ,  Metzen, Peter

发明人： DIERING, Bernd ,  DIERING, Andreas ,  METZEN, Peter ,  HEMPEL, Dietmar, C. ,  JUNG, Thomas ,  KRULL, Rainer ,  DÖPKENS, Eckart

IPC分类号： C02F9/04 ,  C02F1/78 ,  C02F1/72 ,  C02F3/32

CPC分类号： C02F1/722 ,  C02F1/001 ,  C02F1/78 ,  C02F3/30 ,  C02F9/00 ,  C02F2103/24 ,  C02F2103/30 ,  C02F2209/04 ,  C02F2305/06

摘要： The invention relates to a method for biologically treating waste water containing dye from the textile and leather industry, in particular waste water containing azo and sulphur dyes. According to said method: the waste water containing dye is fed to an anaerobic preliminary stage with a negative redox potential, (1st treatment stage); the waste water then passes to an optionally anaerobic or aerobic activated-sludge stage, (2nd treatment stage) and is fed to an aerobic secondary treatment stage (3rd treatment stage). According to the invention, in a chemical/oxidative treatment stage, ozone or a combination of ozone and hydrogen peroxide is added as an oxidation agent to the waste water or recycled water that has been treated in the known manner and at least the main portion of the recycled water is subsequently fed back to the production process as process water.