EP 1206416 A1 20020522 - HYBRID CHEMICAL AND BIOLOGICAL PROCESS FOR DECONTAMINATING SLUDGE FROM MUNICIPAL SEWAGE
Title (en)
HYBRID CHEMICAL AND BIOLOGICAL PROCESS FOR DECONTAMINATING SLUDGE FROM MUNICIPAL SEWAGE
Title (de)
CHEMISCH- UND BIOLOGISCHES HYBRIDES VERFAHREN ZUR ENTGIFTUNG VON KOMMUNALABWÄSSERN
Title (fr)
PROCEDE HYBRIDE CHIMIQUE ET BIOLOGIQUE DE DECONTAMINATION DE BOUES D'EPURATION MUNICIPALES
Publication
Application
Priority
- CA 0000884 W 20000727
- CA 2279525 A 19990803
Abstract (en)
[origin: WO0109045A1] 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.
IPC 1-7
IPC 8 full level
C12N 1/20 (2006.01); C02F 3/34 (2006.01); C02F 9/00 (2006.01); C02F 11/00 (2006.01); C02F 11/06 (2006.01); C02F 11/14 (2006.01); C02F 1/52 (2006.01); C02F 1/66 (2006.01); C02F 1/72 (2006.01); C02F 1/78 (2006.01)
CPC (source: EP US)
C02F 3/345 (2013.01 - EP US); C02F 9/00 (2013.01 - EP US); C02F 11/004 (2013.01 - EP US); C02F 1/52 (2013.01 - EP US); C02F 1/66 (2013.01 - EP US); C02F 1/72 (2013.01 - EP US); C02F 1/722 (2013.01 - EP US); C02F 1/78 (2013.01 - EP US); C02F 2101/20 (2013.01 - EP US); C02F 2303/04 (2013.01 - EP US)
Citation (search report)
See references of WO 0109045A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0109045 A1 20010208; AU 6419800 A 20010219; BR 0012944 A 20020611; CA 2279525 A1 20010203; CN 1367759 A 20020904; EP 1206416 A1 20020522; JP 2003506200 A 20030218; MX PA02001224 A 20040622; US 2002153307 A1 20021024; US 6855256 B2 20050215; ZA 200201002 B 20030430
DOCDB simple family (application)
CA 0000884 W 20000727; AU 6419800 A 20000727; BR 0012944 A 20000727; CA 2279525 A 19990803; CN 00811211 A 20000727; EP 00951147 A 20000727; JP 2001514251 A 20000727; MX PA02001224 A 20000727; US 6027702 A 20020201; ZA 200201002 A 20020205