Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1994-12-02
1997-07-15
Popovics, Robert
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210791, 210739, 210741, 21032169, B01D 6202
Patent
active
056479883
ABSTRACT:
A method for back-washing a submerged-type ceramic membrane separation apparatus is provided in which filtrate once removed from the apparatus and a chemical agent are forcibly supplied to filtrate passages in ceramic membrane filters to wash the ceramic membrane filters with the filtrate and with the chemical agent, wherein the water washing and chemical washing are carried out at a predetermined frequency ratio and for a predetermined time period, or wherein the frequency and time period of the chemical washing are determined on the basis of a transmembrane pressure difference, suction pressure or filtrate flux observed during a filtering operation performed by the membrane separation apparatus. This method makes it possible to avoid an excessive chemical washing, and to reduce the amounts of water and chemical agent and the time required for the chemical washing.
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Ishihara Katsuro
Kawanishi Toshio
Narukami Yoshihisa
Ozaki Toshiya
Shioyama Masahiko
Hochberg D. Peter
Kubota Corporation
Kusner Mark
Popovics Robert
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