WIPO logo
Mobile | Deutsch | Español | Français | 日本語 | 한국어 | Português | Русский | 中文 | العربية |
PATENTSCOPE

Search International and National Patent Collections
World Intellectual Property Organization
Search
 
Browse
 
Translate
 
Options
 
News
 
Login
 
Help
 
Machine translation
1. (WO1992004284) METHOD FOR PURIFICATION OF WASTEWATER
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1992/004284    International Application No.:    PCT/SE1991/000582
Publication Date: 19.03.1992 International Filing Date: 04.09.1991
Chapter 2 Demand Filed:    13.03.1992    
IPC:
C02F 3/00 (2006.01), C02F 3/04 (2006.01), C02F 3/12 (2006.01), C02F 3/28 (2006.01)
Applicants: AXEL JOHNSON ENGINEERING AB [SE/SE]; Box 1004, S-109 25 Nynäshamn (SE) (For All Designated States Except US).
JÖNSSON, Kurt, Alfred [SE/SE]; (SE) (For US Only)
Inventors: JÖNSSON, Kurt, Alfred; (SE)
Agent: BILLBERG, Hans; Axel Ehrners Patentbyrå AB, P.O. Box 10316, S-100 55 Stockholm (SE)
Priority Data:
9002864-8 07.09.1990 SE
Title (EN) METHOD FOR PURIFICATION OF WASTEWATER
(FR) PROCEDE D'EPURATION D'EAUX USEES
Abstract: front page image
(EN)In a method of treating wastewater trickling through a granular filter bed activated by bacteria, there is first carried out simultaneous precipitation of phosphor and denitrification, subsequent to which there is carried out a reduction of excess (BOD) in the wastewater, preferably by blowing in an oxygen-containing gas.
(FR)Dans le procédé décrit, qui sert à traiter des eaux usées dégouttant à travers un lit filtrant annulaire activé par voie bactérienne, on effectue d'abord simultanément une précipitation du phosphore et une dénitrification, puis on procède à une réduction de l'excès de demande biochimique d'oxygène (D.B.O) dans l'eau usée, de préférence par insufflation d'un gaz contenant de l'oxygène.
Designated States: AU, CA, JP, KR, US.
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE).
Publication Language: English (EN)
Filing Language: Swedish (SV)