Global Patent Index - EP 0981500 A1

EP 0981500 A1 2000-03-01 - METHOD AND APPARATUS FOR BIOLOGICAL REMOVAL OF NITROGEN COMPOUNDS FROM WATER

Title (en)

METHOD AND APPARATUS FOR BIOLOGICAL REMOVAL OF NITROGEN COMPOUNDS FROM WATER

Title (de)

METHODE UND VORRICHTUNG ZUR BIOLOGISCHEN ENTFERNUNG VON STICKSTOFFVERBINDUNGEN IM WASSER

Title (fr)

PROCEDE ET APPAREIL D'EXTRACTION BIOLOGIQUE DE COMPOSES AZOTES DE L'EAU

Publication

EP 0981500 A1 (EN)

Application

EP 98916800 A

Priority

  • CZ 9800023 W
  • CZ 147997 A

Abstract (en)

[origin: WO9851626A1] Method of removing nitrogen and its compounds from water using biological process in activated sludge suspension. The nitrogen in the form of nitrates and nitrites is removed by means of a denitrification proceeding in a fluidized layer of sludge blanket, the layer being formed by a suspension of biological sludge and being kept in a fluidized condition. Apparatus for performing the method comprises an upwards widening denitrification zone (5), into the lower part of which an admission for the water containing nitrates, an admission for the activated sludge and an admission for the substrate, which has been biologically oxidized during the denitrification, mouth.

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

C02F 3/30

IPC 8 full level (invention and additional information)

C02F 3/28 (2006.01); C02F 3/12 (2006.01); C02F 3/22 (2006.01); C02F 3/30 (2006.01)

CPC (invention and additional information)

C02F 3/1247 (2013.01); C02F 3/223 (2013.01); C02F 3/301 (2013.01); C02F 3/302 (2013.01); Y02W 10/15 (2015.05)

Citation (search report)

See references of WO 9851626A1

Designated contracting state (EPC)

AT DE DK ES FR GB IT NL

EPO simple patent family

WO 9851626 A1 19981119; AU 7028098 A 19981208; CA 2288642 A1 19981119; CZ 9701479 A3 19990414; EP 0981500 A1 20000301; PL 336931 A1 20000717; SK 151299 A3 20000612

INPADOC legal status


2001-05-09 [18W] WITHDRAWN

- Date of withdrawal: 20010314

2001-01-03 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20001121

2000-03-22 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

- Designated State(s): AT DE DK ES FR GB IT NL

2000-03-01 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19991213

2000-03-01 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT DE DK ES FR GB IT NL