Title (en)

METHOD FOR REDUCING SPECIFIC RESISTANCE TO FILTRATION OF BIOLOGICAL SLUDGE DERIVED FROM A WASTE WATER PURIFYING STATION

Title (de)

VERFAHREN ZUR VERMINDERUNG DES SPEZIFISCHEN FILTRATIONSWIDERSTANDS EINES KLÄRSCHLAMMS

Title (fr)

PROCEDE POUR ABAISSER LA RESISTANCE SPECIFIQUE A LA FILTRATION DE BOUES BIOLOGIQUES PROVENANT D'UNE STATION D'EPURATION D'EAUX USEES

Publication

EP 1257506 A1 20021120 (FR)

Application

EP 01907844 A 20010220

Priority

• FR 0100487 W 20010220
• FR 0002188 A 20000222

Abstract (en)

[origin: WO0162679A1] The invention concerns a method for reducing specific resistance to filtration of biological sludge to facilitate the separation of the solid phase and the aqueous phase by mechanical filtering, in particular in a filter press enabling to obtain a compacted cake with specific dry solid content. Said method is characterised in that, prior to mechanical filtering, it consists in adding to the biological sludge mineral particles containing hydrophobic species of magnesium silicate, and hydrophilic species of magnesium and aluminium silicate and/or magnesium and/or calcium carbonate in predetermined relative proportions ranging between 20/80 and 80/20, said particles having a predetermined mean diameter D50 ranging between 3 and 30 microns. The inventive method leads to significant reduction of specific resistance to biological sludge filtering.

IPC 1-7

C02F 11/14

IPC 8 full level

B01D 33/052 (2006.01); C02F 11/14 (2006.01); C02F 11/143 (2019.01); C02F 11/145 (2019.01)

CPC (source: EP US)

C02F 11/143 (2018.12 - EP US); C02F 11/145 (2018.12 - EP US)

Citation (search report)

See references of WO 0162679A1

Designated contracting state (EPC)

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

DOCDB simple family (publication)

WO 0162679 A1 20010830; EP 1257506 A1 20021120; FR 2805180 A1 20010824; FR 2805180 B1 20020913

DOCDB simple family (application)

FR 0100487 W 20010220; EP 01907844 A 20010220; FR 0002188 A 20000222