Abstract: A molded filter element is fabricated by the method comprising the steps of: preparing a plastic composition of a powder-grain adsorbent of 100 weight parts, an emulsion type synthetic resin binder of 5-20 weight parts having a film-making capability at room temperature, an aqueous high-polymer binder of 0.5-5 weight part, and water of the amount sufficient to change the compound of these agents into a composition having its own shape holding property; pressure-filling said plastic composition in a mold composed of plural members to provide a molded filter element; evaporating water until the molded filter element has a shape-holding strength in a state where at least one member of said mold is removed; and heat-treating the molded filter element at a temperature of 110.degree.-160.degree. C.

Abstract: A filtration concentration apparatus and method by which a high operation efficiency of a filter is assured are disclosed. The filtration concentration apparatus comprises an original liquid intake path interconnecting a primary side of a pump and an original liquid storage tank, an original liquid supply path interconnecting a secondary side of the pump and an original liquid chamber of a filter, an original liquid return path interconnecting the secondary side of the pump and the storage tank, an original liquid recovery path interconnecting the original liquid chamber and the primary side of the pump, a liquid discharge path interconnecting a bottom portion of the original liquid chamber and a waste liquid tank, and a control unit for controlling the recovery path to open when the intake path and the supply path are open and controlling the intake path and the supply path to close when the recovery path and the return path are open.

Abstract: The brine purifying system employs a multistage filtering apparatus comprising a plurality of the same filter units piled up one over another to form a plurality of cascaded filtering stages. When the filter layers of the filter units are clogged with unsoluble matters, the operation of the multistage filtering apparatus is interrupted, then a solvent for the unsoluble matters is circulated through the multistage filtering apparatus to remove the unsoluble matters arrested by the filter layers by dissolving the same therein. Then, a washing liquid is circulated through the multistage filtering apparatus to wash the multistage filtering apparatus completely. The solvent and the washing liquid used for regenerating and washing the multistage filtering apparatus are recovered and are used for dissolving salt to prepare saturated brine. The unsoluble matters thus removed from the filter layers are removed by being precipitated in a precipitating tank.

Abstract: A filter assembly comprises a casing, a semiflexible, perforated core and a filter cloth. The casing is provided with a liquid inlet and a liquid outlet and the core is arranged within the casing and between the liquid inlet and the liquid outlet so that liquid which passes from the inlet to the outlet must pass through the core at least once. The filter cloth covers the surfaces of the core so that liquid which passes from the inlet to the outlet must pass through the filter cloth at least once. In a first embodiment, the core includes an outer cylindrical portion, an inner cylindrical portion, an annular intermediate portion extending between the outer cylindrical portion and the inner cylindrical portion, and a plurality of fin portions extending radially inward from the outer cylindrical portion toward the inner cylindrical portion. In a second embodiment, the core includes a cylindrical portion and a plurality of fin portions extending radially outward from the cylindrical portion.

Abstract: An automatic filtration dewatering system includes a cover to which a filtration raw liquid supply pipe and a pressure air supply pipe are connected. A plate having a filter medium support and a filtrate exhaust pipe is selectively closed by a cover with a pneumatic cylinder vertically moving said cover. Filter medium moving rollers are provided on both sides of the cover and plate, and a sheet-like long filter medium is stretched over said rollers for movement a predetermined distance per one step of filtration.

Abstract: A cross-flow type filter system includes a filter body divided into an inner primary chamber and an outer secondary chamber by a partition for fixing a plurality of flat filter media in parallel with each other, a rotor located within said primary chamber and adjacent to the surfaces of said filter media. The rotor is rotatable about a shaft extending therethrough and vertical with respect to the surfaces of the media, and allowes a liquid to flow in a direction parallel with the shaft. The system also includes a feed inlet passage provided to the primary chamber at a position adjacent to the shaft, a feed inlet passage located at a position around and adjacent to the media, and a filtrate outlet passage provided to the secondary chamber.

Abstract: An article washing method includes the steps of bringing an article into a washing chamber; spraying a first washing liquid fed from a washing liquid tank to the article; separating off an initial most contaminated portion of the washing liquid used; repeating the spray with use of a cleaner washing liquid fed from a second washing liquid tank if required; moving the article after treatment by the spray to a third washing liquid tank to immerse the article in clean washing liquid; and sequentially supplying a part of the clean washing liquid from the latter stage to the washing liquid tank in an earlier stage so as to compensate for a decrease corresponding to the amount of the contaminated washing liquid discharged. The present invention makes it possible to reduce generation of waste liquid to a minimum and provides an improved washing effect by allowing the setting of optimum operational conditions.

Abstract: A method and apparatus for filtering/concentrating a raw liquid such as industrial waste water or suspension of various kinds. Such raw liquid is additionally dispersed with grains in advance before being subjected to a cross flow filtration in which a tubular filtering member is used. The raw liquid is supplied through the tubular member under pressure. Since the tubular filtering member is provided with a guide member which guides the supplied raw liquid spirally therealong, suspended matter or suspended particles will not stay on the filtering surface. The size of the grains is less than one third the diameter of the tubular member in case where said grains have a specific gravity larger than the raw liquid. If the grains have a specific gravity smaller than the raw liquid, the grain size may vary from one tenth to nine tenths the tubular filtering member.

Abstract: The brine purifying system employs a multistage filtering apparatus comprising a plurality of the same filter units piled up one over another to form a plurality of cascaded filtering stages. When the filter layers of the filter units are clogged with unsoluble matters, the operation of the multistage filtering apparatus is interrupted, then a solvent for the unsoluble matters is circulated through the multistage filtering apparatus to remove the unsoluble matters arrested by the filter layers by dissolving the same therein. Then, a washing liquid is circulated through the multistage filtering apparatus to wash the multistage filtering apparatus completely. The solvent and the washing liquid used for regenerating and washing the multistage filtering apparatus are recovered and are used for dissolving salt to prepare saturated brine. The unsoluble matters thus removed from the filter layers are removed by being precipitated in a precipitating tank.

Abstract: In a method of filtering and condensing a suspension containing a solid suspended substance, the improvement comprising the step of vibrating a board member provided in the suspension in opposed relation with a filtration surface in a direction parallel to the filtration surface. The board member is provided at a distance of preferably 10 mm or less from the filtration surface.

Abstract: A system for recovery and recycling of a washing liquid and heat contained in the washings discharged from a metal surface treatment process comprises a hot water washing tank with an associated cushion tank, a cold water washing tank with an associated cushion tank, a heat exchanger, an ion exchanger and a filter. The second-mentioned cushion tank is in communication with the hot water washing tank through the heat exchanger, while the first-mentioned cushion tank is in communication with the cold water washing tank through the filter, the heat exchanger and the ion exchanger.

Abstract: A filter characterized in that a plurality of screen plates each having a penetration hole at its central portion are disposed inside of a filter box in a stacked form with a distance between each other in such a manner that the penetration holes are aligned up-and down-wards. The raw liquid to be filtered is fed through said penetration holes and the filtrate is collected at plurality of portions disposed at a nearly equal intervals in the peripheral part of said screen plates.