Global Patent Index - EP 1049652 A1

EP 1049652 A1 2000-11-08 - CONDITIONING METHOD FOR DEHYDRATING CLARIFICATION SLUDGE

Title (en)

CONDITIONING METHOD FOR DEHYDRATING CLARIFICATION SLUDGE

Title (de)

KONDITIONIERUNGSVERFAHREN ZUR KLÄRSCHLAMMENTWÄSSERUNG

Title (fr)

PROCEDE DE CONDITIONNEMENT POUR LA DESHYDRATATION DES BOUES DE CURAGE

Publication

EP 1049652 A1 (DE)

Application

EP 99902534 A

Priority

  • DE 19802238 A
  • EP 9900135 W

Abstract (en)

[origin: DE19802238A1] Sewage sludge is first subjected to a conventional oxidative preconditioning with hydrogen peroxide under acidic conditions and then subjected to an inorganic postconditioning by adding calcium hydroxide (Ca(OH)2) to adjust the pH to 9-11 before mechanical dewatering. Preconditioning comprises adding substoichiometric amounts of hydrogen peroxide and iron ions at a pH of 5 or less to effect catalytic partial oxidation.

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

C02F 1/72; C02F 11/14

IPC 8 full level (invention and additional information)

C02F 1/72 (2006.01); C02F 11/06 (2006.01); C02F 11/14 (2006.01)

CPC (invention and additional information)

C02F 11/06 (2013.01); C02F 11/14 (2013.01); C02F 2305/026 (2013.01)

Citation (search report)

See references of WO 9937585A1

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

DE 19802238 A1 19990729; AU 2278999 A 19990809; CA 2318092 A1 19990729; EP 1049652 A1 20001108; JP 2002500953 A 20020115; US 6368511 B1 20020409; WO 9937585 A1 19990729

INPADOC legal status


2003-06-25 [18R] REFUSED

- Effective date: 20030203

2002-04-10 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020221

2000-11-08 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000822

2000-11-08 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT