Battelle Memorial Institute

The Dow Chemical Company

Societe Anonyme Automobiles Citroen

Augusto Porta

Antonin Kulhanek

Denis Doniat

Alain Groult

Jean-Marie Fresnel

Jacques Mosetti

Herve Tournier

Bernard Bugnet

Guy Bunter

Andre Ayerbe

Jean-Michel Corajoud

Herve ' Tourrier

Maurice Schaub

A process is disclosed for the electrochemical decontamination of polluted water in a cell containing a porous cathode in the presence of oxygen. The oxygen is reduced in the presence of the cathode and the electro-reduction products are themselves used as depollution agents in the polluted water.

Process for the electrochemical decontamination of water polluted by

Apparatus for sterilizing objects with an aqueous hypochlorite solution

Automatic washing machine or dishwasher

Method and apparatus for concentrating an aqueous sludge by

Method for preparing an aqueous treatment solution containing at least

Method and machine for washing and bleaching textiles

A process for removing chlorate from a caustic solution by the reduction of the chlorate with metallic iron. The process is particularly distinguished by the steps of contacting the caustic solution with iron to reduce the chlorate to chloride, contacting the caustic solution containing dissolved iron therein with a conductive substrate to electrolytically precipitate the iron on the substrate, thus providing a caustic solution which is substantially free from iron and chlorate ions, separating the purified portion of the caustic solution, and periodically using the iron coated substrate for treating an untreated portion of the caustic solution to reduce the chlorate to chloride, and periodically reusing the iron depleted substrate, for recovering dissolved iron from the caustic solution. The process of this invention decreases the chlorate content of caustic solutions to an acceptable level of a few ppm and also recovers dissolved iron on an iron depleted substrate for reuse and further reduction of chlorate of an untreated portion of the caustic solution.

Method for removing chlorate from caustic solutions with electrolytic

Process for regenerating activated carbon particles contaminated by oxidizable impurities. An electrolysis cell is divided by a liquid-permeable membrane to define an anodic chamber and a cathode chamber therein both filled in operation with an electrolyte. Recycling conduits communicate with the anode chamber and a recirculating pump to establish a fluid circuit therewith. A suspension of particles of activated carbon contaminated by oxidizable impurities suspended in an aqueous solution of an electrolyte is loaded into the fluid circuit and circulated therethrough. A voltage applied to the electrodes of the electrolysis cell develops an electrolysis reaction in the aqueous solution of the electrolyte and atomic oxygen is liberated at the surface of the anode electrode. As particles of the activated carbon flow through the anode cell they contact the anode electrode and atomic oxygen is liberated at their surfaces which oxidizes impurities adsorbed by the particles. After the carbon particles have been circulated for a sufficient time to oxidize all of the impurities thereon, the regenerated particles of activated carbon and the aqueous solution of the electrolyte are discharged from the recirculating circuit.

Process for regenerating contaminated activated carbon

Metal is electrodeposited on conductive granules in apparatus comprising a helical channel with a cathode at its radially outer side and an anode at its radially inner side. A suspension of the granules in an electrolysis solution is fed tangentially into an end of the channel so that the granules are urged by centrifugal force against the cathode and form a mass moving along the channel to its outlet. The emerging granules are separated from the used solution in a cyclone and the solution is recirculated along the axis of the helix.

Process for electro-depositing a metal on conducting granules

A process for producing electric current by the electrochemical oxidation of an active anodic metal dispersed in an alkaline electrolyte. The electrolyte is circulated into contact with a second metal which is more electronegative than the active metal. A displacement reaction precipitates the active metal from its soluble oxidation products. There is obtained as a result a repeated recovery for reuse of the active metal (zinc) with the aid of the more electronegative metal (aluminium) which then supplies the energy for the production of current and is oxidized to form soluble products. The process is exemplified by zinc as the active metal and aluminium and magnesium as the strongly electronegative metals.

Process for producing electric current by the electrochemical oxidation

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Geneva, Switzerland

Augusto Porta