Abstract:
A foul-resistant, flow-through capacitor, a system employing the capacitor and a method of separation is disclosed wherein the capacitor has at least one anode and cathode electrode pair. The electrodes are formed of high surface area, electrically conductive material and have an open, preferably straight, fluid flow-through path. Typically, the flow path is formed by a plurality of straight, parallel, spaced apart electrodes with the flow path not greater than one of the X-Y-Z distance components of the capacitor. The flow-through capacitor avoids fouling in use and may be employed with saturated waste or other streams.
Abstract:
A foul-resistant, flow-through capacitor, a system employing the capacitor and a method of separation is disclosed wherein the capacitor has at least one anode and cathode electrode pair. The electrodes are formed of high surface area, electrically conductive material and have an open, preferably straight, fluid flow-through path. Typically, the flow path is formed by a plurality of straight, parallel, spaced apart electrodes with the flow path not greater than one of the X-Y-Z distance components of the capacitor. The flow-through capacitor avoids fouling in use and may be employed with saturated waste or other streams.
Abstract:
An electrodeionization apparatus is provided for removing ions from liquids. The apparatus is particularly well-adapted for the removal of large, heavily hydrated, highly charged or weakly ionized molecules or complexes from feed water. Such removal is achieved by substituting, in at least one section of the apparatus, ion exchange membranes and/or resins having lower crosslinking and/or lower selectivity, for the ion exchange membranes commonly used in electrodeionization systems. Methods for reducing the electrical resistance across the membrane also are provided.
Abstract:
Applying a desorbing wave energy to a soil matrix can effect desorption of ionic species which are associated with the matrix. This method is especially applicable to decontamination of soils to which metals and/or radioactive isotopes are adsorbed. The desorbing energy may be microwave energy, sonic or ultrasonic energy, etc., or combinations thereof. An electromagnetic potential also can be applied to the matrix to enhance desorption and or migration of the species. An electrolyte also may be added to the matrix to enhance desorption and or migration of the species.
Abstract:
A process and apparatus for the in-situ decontamination of ground water polluted with heavy metal ions, wherein a ground water peak (26) is built up by means of gasification (24) in a well pipe (10), and a current is produced in the ground water. The current is conducted through a siphon (18, 44, 46) furnished with an ion exchanger (50), and the heavy metal ions from the water current migrate to the ion exchanger by the application of electrical voltage (48).
Abstract:
A process for removing an ionic impurity from an impure substantially non-aqueous liquid passes the impure non-aqueous liquid through at least one ion exchange compartment containing an ion exchange medium. The ion exchange compartment is separated from an anode compartment and a cathode compartment by ion exchange membranes, where the ion exchange membranes and ion exchange medium having functional groups of the opposite charge as that of the ionic impurity. An electric current is conducted across the ion exchange compartment substantially transverse to the direction of flow of the impure non-aqueous liquid, and transporting the ionic impurity through an ion exchange membrane to separate the ionic impurity from the non-aqueous liquid.
Abstract:
Water softening by a combination of electrodialysis and calcium carbonate precipitation. The hard feed water or alternatively recycled soft water is rendered alkaline and is then subjected to a treatment by which precipitation of calcium carbonate is induced. One way of bringing about such precipitation consists in passing the alkaline water across a cake of calcium carbonate crystals having a size not exceeding 100 microns, deposited on a filter and being in an at least fifty fold excess over the amount of calcium carbonate to be precipitated.
Abstract:
Apparatus and method for introducing ion-exchange and other particulates into certain compartments of an assembled electrodeionization stack comprising flowing a slurry of said particulates into the compartments while employing strainers for particulate retention so as to form a packed bed in the compartments; also apparatus and method for flowing said particulates out of said stack in the form of a slurry.
Abstract:
A controlled charge chromatography column for the purification of a fluid-containing material, which column comprises a chromatographic column having an inlet for the introduction of a fluid to be purified and an outlet for the discharge of the purified fluid, and one or more concentrated materials and a flow-through capacitor disposed within the column between the inlet and outlet, the flow-through capacitor means comprising a plurality of spirally wound or stacked washer layers to include a first electrically conductive backing layer, such as of graphite, and a first high surface area conductive layer secured to the backing layer, such as composed of porous carbon fibers and a non-conductive, porous spacer layer to electrically insulate the backing and conductive layer and to permit the flow of material therethrough, the flow-through capacitor to be connected to a DC power source to charge the respective conductive layers with different polarities whereby a fluid containing material through the colum is purified by the electrically conductive stationary phase and the retention thereof onto the high surface area layer and permitting for example the purification of solutions of liquids, such as salt, and providing for the recovery of a purified liquid.