Global Patent Index - EP 1242316 A1

EP 1242316 A1 2002-09-25 - CATIONIC POLYMERS FOR SLUDGE DEWATERING

Title (en)

CATIONIC POLYMERS FOR SLUDGE DEWATERING

Title (de)

KATIONISCHE POLYMERE ZUR SCHLAMMENTWÄSSERUNG

Title (fr)

POLYMERES CATIONIQUES POUR LA DESHYDRATATION DES BOUES

Publication

EP 1242316 A1 (EN)

Application

EP 00970398 A

Priority

  • SE 0001922 W
  • SE 9903594 A

Abstract (en)

[origin: WO0125156A1] A method and a composition for dewatering sludges are described. The method for dewatering sludges includes treating the sludge with a flocculant aid and with a flocculant, whereafter the sludge is dewatered. The method is characterised in that the flocculant aid is an inorganic compound; the flocculant aid and the flocculant are provided as a solid composition comprising 0.1-10 parts by weight of flocculant aid per part by weight of flocculant; water is added to the composition to provide an aqueous solution or dispersion of the composition; said aqueous composition is added to the sludge; and that the sludge is dewatered. The composition for dewatering sludges is characterised in that it comprises a mixture of a solid inorganic flocculant aid with a solid flocculant at a ratio of 0.1-10 parts by weight of flocculant aid per part by weight of flocculant.

IPC 1-7 (main, further and additional classification)

C02F 1/56; C02F 11/14

IPC 8 full level (invention and additional information)

C02F 1/52 (2006.01); C02F 11/14 (2006.01); C02F 1/56 (2006.01)

CPC (invention and additional information)

C02F 1/5236 (2013.01); C02F 11/14 (2013.01); C02F 1/56 (2013.01)

Citation (search report)

See references of WO 0125156A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 0125156 A1 20010412; WO 0125156 A8 20020110; AU 7978700 A 20010510; CN 1384806 A 20021211; EP 1242316 A1 20020925; SE 9903594 D0 19991006; SE 9903594 L 20010407

INPADOC legal status


2004-04-14 [18W] APPLICATION WITHDRAWN

- Effective date: 20040221

2002-11-06 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: BISBAL TUDELA, JOSEP, LLUIS

2002-11-06 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: CRESTA, FRANZ

2002-11-06 [RIN1] INVENTOR CHANGED BEFORE GRANT

- Inventor name: CELLI, ENRICO

2002-09-25 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020405

2002-09-25 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2002-09-25 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI