EP 1028918 A1 20000823 - APPARATUS FOR DEWATERING PREVIOUSLY-DEWATERED MUNICIPAL WASTE-WATER SLUDGES USING HIGH ELECTRICAL VOLTAGE
Title (en)
APPARATUS FOR DEWATERING PREVIOUSLY-DEWATERED MUNICIPAL WASTE-WATER SLUDGES USING HIGH ELECTRICAL VOLTAGE
Title (de)
METHODE UND VORRICHTUNG ZUR ENTWÄSSERUNG VON VORENTWÄSSERTEN KOMMUNALEN ABWASSERSCHLÄMMEN MITTELS HOCHSPANNUNG
Title (fr)
APPAREIL SERVANT A DESHYDRATER LES BOUES D'EAUX USEES MUNICIPALES PREALABLEMENT DESHYDRATEES A L'AIDE DE DECHARGES ELECTRIQUES A HAUTE TENSION
Publication
Application
Priority
US 9720631 W 19971112
Abstract (en)
[origin: CA2307724A1] The present invention is directed to a pulsed electric-field system, apparatus and method for the effective disinfecting and dewatering previously-dewatered, biologically active waste-water sludges (e.g., municipal waste-water sludge) in an efficient manner, so as to dramatically reduce the resulting volume of the inert waste material which has to be disposed of by the municipality. The method employed sequentially consists of hydraulically pressurizing (24, 26) the previously dewatered sludge, pre-heating (32) the previously dewatered sludge to a predetermined temperature range, exposing the previously dewatered sludge to high energy pulsing electrical discharges (42), pressure separation (52) of the resulting solids and liquid fraction, and final pressure extrusion (70) of the separated solids through nozzles.
[origin: CA2307724A1] The present invention is directed to a pulsed electric-field system, apparat us and method for the effective disinfecting and dewatering previously-dewatere d, biologically active waste-water sludges (e.g., municipal waste-water sludge) in an efficient manner, so as to dramatically reduce the resulting volume of the inert waste material which has to be disposed of by the municipality. Th e method employed sequentially consists of hydraulically pressurizing (24, 26) the previously dewatered sludge, pre-heating (32) the previously dewatered sludge to a predetermined temperature range, exposing the previously dewater ed sludge to high energy pulsing electrical discharges (42), pressure separatio n (52) of the resulting solids and liquid fraction, and final pressure extrusi on (70) of the separated solids through nozzles.
IPC 1-7
IPC 8 full level
C02F 1/48 (2006.01); C02F 11/12 (2006.01)
Citation (search report)
See references of WO 9924372A1
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
AU 5177698 A 19990531; CA 2307724 A1 19990520; CA 2307724 C 20030318; EP 1028918 A1 20000823; JP 2001522721 A 20011120
DOCDB simple family (application)
AU 5177698 A 19971112; CA 2307724 A 19971112; EP 97946649 A 19971112; JP 2000520389 A 19971112