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1. (WO2015118223) METHOD OF PURIFYING LIQUID BY USE OF A PARTICULATE SORBENT

Pub. No.:    WO/2015/118223    International Application No.:    PCT/FI2015/050068
Publication Date: Fri Aug 14 01:59:59 CEST 2015 International Filing Date: Wed Feb 04 00:59:59 CET 2015
IPC: B01D 36/00
B01D 61/14
B01D 63/06
C02F 1/28
Applicants: SOFI FILTRATION OY
Inventors: AHO, Simo
HAKALA, Ville
RANTALA, Pertti
Title: METHOD OF PURIFYING LIQUID BY USE OF A PARTICULATE SORBENT
Abstract:
The invention relates to a method of purifying liquids, which contain impurities such as oil or dissolved metals. The liquid is first mixed with a finely-divided particulate sorbent to form a suspension, in which impurities are adsorbed or absorbed by the sorbent particles, to form a pre-mixed suspension. A flow of this suspension is then directed substantially tangentially towards a surface of a porous filtering element (7), where- by part of the liquid penetrates through the filtering element and is re- moved through a filtrate outlet as purified liquid filtrate (8). The tangential flow keeps the filtering element (7) unblocked, and the sorbent, together with the rest of the liquid travels along the surface of the filtering element to be removed through a retentate outlet (9). The method is even useful for clarifying the liquid by removal of finely-divided solid impurities.