EP 4017835 A1 20220629 - A PROCESS FOR REDUCING PHOSPHORUS IN EFFLUENTS FROM A PULPING PROCESS
Title (en)
A PROCESS FOR REDUCING PHOSPHORUS IN EFFLUENTS FROM A PULPING PROCESS
Title (de)
VERFAHREN ZUM REDUZIEREN VON PHOSPHOR IN ABWÄSSERN AUS EINEM ZELLSTOFFVERFAHREN
Title (fr)
PROCÉDÉ DE RÉDUCTION DU PHOSPHORE DANS LES EFFLUENTS D'UN PROCÉDÉ DE MISE EN PÂTE
Publication
Application
Priority
- FI 20195695 A 20190823
- FI 2020050537 W 20200818
Abstract (en)
[origin: WO2021038126A1] A process for reducing phosphorus in effluents from a pulping process (1) is disclosed. The process comprises combining a plurality of acidic effluents (2, 2', 2'') obtainable from the pulping process into an acidic effluent stream (3); combining a plurality of alkaline effluents (4, 4', 4'') obtainable from the pulping process into an alkaline effluent stream (5); treating at least a portion (6) of the acidic effluent stream by adjusting the pH thereof to alkaline with an alkaline agent (7), such that phosphorus in the at least the portion of the acidic effluent stream is precipitated in the form of a phosphate salt, and by removing the precipitate (8) at least partially to produce a purified effluent stream (9); and combining the purified effluent stream with the alkaline effluent stream and optionally with the untreated portion of the acidic effluent stream (10).
IPC 8 full level
C02F 1/52 (2006.01); C02F 1/66 (2006.01); D21C 11/00 (2006.01); C02F 101/10 (2006.01); C02F 103/28 (2006.01)
CPC (source: EP FI)
C02F 1/5245 (2013.01 - EP); C02F 1/66 (2013.01 - EP FI); D21C 11/0028 (2013.01 - EP FI); C02F 2101/105 (2013.01 - EP); C02F 2103/28 (2013.01 - EP); C02F 2209/18 (2013.01 - EP); C02F 2301/043 (2013.01 - EP); D21C 11/0007 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2021038126 A1 20210304; BR 112022003245 A2 20220531; CL 2022000408 A1 20230203; CN 114667269 A 20220624; EP 4017835 A1 20220629; FI 129811 B 20220915; FI 20195695 A1 20210224; UY 38852 A 20210226
DOCDB simple family (application)
FI 2020050537 W 20200818; BR 112022003245 A 20200818; CL 2022000408 A 20220221; CN 202080074804 A 20200818; EP 20764135 A 20200818; FI 20195695 A 20190823; UY 38852 A 20200821