Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...
Patent
1995-06-07
1998-01-06
McCarthy, Neil
Chemistry: electrical and wave energy
Processes and products
Electrophoresis or electro-osmosis processes and electrolyte...
204525, 204529, 204634, 4232431, B01D 5350
Patent
active
057050465
ABSTRACT:
A process for treating effluent from a flue-gas desulfurization system wherein the resulting gypsum is removed, comprises filtering the gypsum and fly ash free effluent by a filter, transferring the filtrate to an electrodialyzer wherein cation-exchange membranes and univalent anion-exchange membranes are alternately set up, concentrating chlorine ions in the solution therein by dialysis, further concentrating the solution by evaporation in an evaporator, kneading the concentrated solution with cement or a mixture of cement and coal ash to a solid matter with no harm, and thereafter abandoning for landfill; and an apparatus for treating effluent from a flue-gas desulfurization system, comprising a filter for filtering the effluent to a turbidity low enough for treatment by an electrodialyzer wherein the effluent is to be separated into concentrated and dilute solutions, the electrodialyzer equipped with an alternate arrangement of cation- and anion-exchange membranes, with concentration and dilution compartments alternately provided between the both ion-exchange membranes, means for conducting the concentrated solution to a step for final disposal, and means for recycling the dilute solution as makeup water to the desulfurization system.
REFERENCES:
patent: 4802966 (1989-02-01), Aoki et al.
patent: 5433936 (1995-07-01), Ukawa et al.
Aoki Yoshiharu
Kotake Shinichiro
Miwata Tatunori
Nakamura Tsumoru
Asahi Glass Company Ltd.
Chubu Electric Power Company, Incorporated
McCarthy Neil
Mitsubishi Jukogyo Kabushiki Kaisha
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