Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1993-02-24
1994-07-05
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
210748, C02F 1461
Patent
active
053264398
ABSTRACT:
A process for removing heavy metal contaminants from groundwater without injecting anion contaminants thereinto and without providing surface sludge for disposal is described. The process consists of withdrawing a flow of groundwater containing the contaminants and passing the flow of groundwater through an electrochemical cell having at least an anion of iron or an iron containing alloy wherein the cell consists of an anode, a cathode, and a plurality of closely spaced additional electrodes disposed therebetween. The cell then generates ferrous ion and hydroxyl ions into the solution which is then reinjected upstream of the flow. In-situ then hexavalent chromium will be reduced to nontoxic trivalent chromium and will form an insoluble iron containing compound or complex with the hydroxide to immobilize the chromium in-situ. Other heavy metal contaminants similarly will be immobilized by reacting with the iron, or through the absorbent properties of a ferrous iron hydroxide generated.
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Andco Environmental Processes, Inc.
Niebling John
Phasge Arun S,.
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