Abstract:
An electrolytic disinfectant system especially useful in a maritime application for treating freshwater so as to render it potable, provides a brine solution that is stored in a tank from which hypochlorite as the disinfectant is fed to a freshwater supply. Gases also fed to the disinfectant storage tank including hydrogen is discharged therefrom and passed to a hydrogen recombiner through which the hydrogen is disposed of by reaction with oxygen under control of external heating bands to generate water vapor. The system thereby provides enhanced disinfectant effectiveness and eliminates storage of hazardous chemicals.
Abstract:
A halogen generator produces a halogen sanitizing agent to sanitize water in a spa or other water feature. A coaxial wall fitting desirably couples the halogen generator to the water feature. The halogen generator desirably includes a bipolar electrolytic cell in which a center electrode plate rotates between stationary anode and cathode plates. The bipolar electrode includes a plurality of vanes which motivate water flow between the anode and the cathode. The vanes on the rotating electrode also produce a flow of water through the generator. In this manner, the bipolar electrode functions as a impeller to pump water through the halogen generator. The vanes are positioned between the electrode and cathode, and are sufficiently spaced from the cathode to inhibit scale formation on the cathode. The vanes, however, generally do not contact the cathode when rotating. The rotational direction of the electrode relative to the cathode may be reversed periodically and/or the gap spacing between electrode and the cathode may be decreased periodically to enhance removal of scale.
Abstract:
The present invention provides a process for generating an aqueous solution containing at least one active bromine compound comprising the steps of: electrolyzing an aqueous solution containing bromide ions until bromate ions are formed in said aqueous solution; and introducing to the aqueous solution containing bromate ions an acid to generate an aqueous solution containing at least one active bromine compound. The present invention also provides an apparatus for generating an aqueous solution containing at least one active bromine compound. The aqueous solution containing the active bromine compound(s) generated using the process and apparatus of the present invention may be used for water treatment and the recovery of precious metals such as gold.
Abstract:
An apparatus for reducing nitrates in an aqueous solution includes an electrochemical cell having a container for containing the aqueous solution containing nitrates, a carbon fiber cathodic electrode, a carbon fiber anodic electrode, and a reference electrode immersed in the aqueous solution, and an electronic control circuit which impresses a voltage across the electrodes causing electrochemical reduction/oxidation reactions on the surfaces of the electrodes. The electrodes are at a potential such that nitrates are reduced to gaseous products, and further such that hydrogen, oxygen, chlorine, an other noxious substances are not produced. The cell may be a flow cell or a holding tank and apparatus of different size and capacity are disclosed. The apparatus is useful in reducing nitrates in any water system and is particularly useful in reducing nitrates in aquatic systems without harming aquatic life. One of the methods of the invention includes sequentially impressing three voltage signals between the reference electrode and the cathodic electrode, wherein each of the voltage signals are of different magnitudes, the voltage signals being a constant time-out period voltage, a sweep voltage and a constant working voltage.
Abstract:
Electrolytic treaters for treating highly conductive liquid media include a conductive housing structure which is fluidically sealed and has inlet and outlet fluid connections, a conductive electrode structure positioned within the housing structure, and a DC power supply connected to components of the housing and electrode structure in such a manner that the output voltage of the power supply is applied across a substantial portion of the liquid media to be treated to control the current flow from the power supply. In a preferred embodiment, the electrode structure is formed by a center electrode rod with a plurality of ring electrodes positioned coaxially between the center electrode rod and the housing. Each ring electrode is formed by a plurality of circumferentially spaced rod elements extending parallel to the center electrode. The rod elements in a given ring electrode are held in place by a plurality of annular spacer baffles which additionally affect the flow of liquid media through the treater.
Abstract:
An electrolytic chlorine gas generating system is disclosed. The system includes an electrolytic cell generating the chlorine gas, a brine tank supplying saturated brine to the anode compartment of the cell, and an acid feed tank containing hydrochloric acid at sufficient concentration to maintain the anolyte brine at less than about pH 4.0. In operation, the brine tank contains solid sodium chloride which dissolves in the brine and replenishes the anolyte brine solution as chloride ion is consumed during electrolysis. The acid feed tank is in fluid communication with the brine tank so that the brine is maintained at a constant volume during electrolysis. A caustic system is also disclosed including a means for controlling caustic delivery.
Abstract:
This invention provides electrochemical methods for producing hydroxyl free radicals and decomposing by oxidation chemical substances dissolved in water. It utilizes a novel electrode which is capable of operation at sufficiently positive anodic potential to produce hydroxyl radicals. A complete device for oxidizing chemical substances dissolved in water is described, and operating conditions favorable to the method are discussed. Examples of oxidation reactions are presented, including oxidation of an herbicide, an insecticide, toluene, cresol, and a fluoroalkyl surfactant.
Abstract:
A device for silverizing water has a plurality of electrodes including silver electrodes so that a passing water is saturated with silver ions, and a temperature maintaining unit with cooling and heating elements to maintain a required temperature and silver ions saturation of water.
Abstract:
A process for breaking down organic substances and/or microbes in pretreated feed water for high-purity recirculation systems using ozone which is generated in the anode space (5) of an electrochemical cell (3) and treated with ultraviolet rays and/or with H.sub.2 (8) generated in the cathode space (6) of the same cell (3) or H.sub.2 (20) supplied from outside. The latter is used to reduce elementary oxygen in any form to harmless water. Post treatment via mixed bed (14) and filter (15). Possibility of feeding back water (19) downstream of the receiver (17). No harmful reaction products.