Membrane filtration

Details Membrane filtration Membrane filtration

2005-12-13

2005-12-13

Walker, W. L. (Department: 1723)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C210S651000, C210S652000, C210S653000, C210S654000, C210S777000, C210S702000, C210S723000, C210S696000

Reexamination Certificate

active

06974544

ABSTRACT:
A method for membrane filtration of effluent water containing suspended matter reduces membrane clogging and improves filtration capacity of the membrane. The method includes adding a dose of a preselected coagulation reactant to the effluent before the effluent passes over the membrane. The added dose is a fraction of the coagulating reactant dose (X) that would render the zeta potential of the effluent equal to zero. The range of the added dose is X/30-X/80. The suspended matter in the effluent is subjected to the added dose of coagulation reactant for destabilizing the suspended matter.

REFERENCES:
patent: 5871648 (1999-02-01), Allen et al.
patent: 6416668 (2002-07-01), Al-Samadi
J. Allam et al., 2003, Ultrafiltration pre-treatment to RO: Trials at Kindasa water services, Jeddah, Saudi Arabia, IDA Conference in Bahamas.
V. Lahoussine-Turcaud et al., 1990, Coagulation Pretreatment for Ultrafiltration of a surface water,J. Am. Water.Work. Assoc., 81, pp 76-81.

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