Hitachi, Ltd.

Katsuhiko Asano

Norihide Saho

Hisashi Isogami

Minoru Morita

Fumitaka Handa

Hiroshi Hashimoto

Isamu Kamishita

Isao Kurita

A waste water purification system for purifying polluted salt water including oil and the like by coagulating and separating pollutant matter in the polluted salt water can regenerate and reuse a coagulant in the system while scarcely resupplying the coagulant, an acid solution and an alkaline solution. The acid and alkaline solutions are required for disintegrating coagulated flocs from the polluted salt water and regenerating the coagulant from sludge. Alkaline water enriched in sodium hydroxide and an acidic aqueous solution containing hydrochloric acid and the like are generated by electrolyzing the purified salt water. The flocs in the separated sludge are disintegrated by use of the alkaline water, pollutant matter is removed from the disintegrated aqueous solution, and the strong acidic containing the hydrochloric acid is added to the aqueous solution removed of the pollutant matter to have the coagulant. The coagulant can be thus regenerated from the recovered sludge.

Waste water purification apparatus and waste water purification method including the regeneration of used coagulant

An improved apparatus for removing magnetic material from a flowing fluid such as water by magnetic separation has a single set of electromagnets which are used with a plurality of magnetic filters for continuous magnetic separation operation alternately without obstructing the flow of the fluid being processed. A high-gradient magnetic filter arrangement which passes through a magnetic field generated by the magnets is made up of at least two magnetic filters separated by a watertight partition. When the fluid being processed is flowing through one of the magnetic filters, the other filter is removed from the flow of the fluid into a magnetic filter housing which is separated from the fluid flow through the magnetic filter by means of partitions. Backwashing of this other magnetic filter is carried out while purification of the fluid being processed by the former magnetic filter continues uninterrupted. Dummy magnetic filters are provided at the outer ends of the magnetic filter arrangement so that whichever of the magnetic filters is removed from the flow of the fluid being processed, the filter matrices do not leave the magnetic field formed by the plurality of magnets, and consequently the magnetic filters can be moved in and out of the magnetic field with a minimal driving force.

Magnetic purifying apparatus for purifying a fluid

The iron core of an electromagnet includes a stack of steel sheets stacked perpendicular to a horizontal axis, presents a sectional shape symmetrical with respect to the horizontal axis and is provided therein with a groove of a specified shape. The iron core is produced by stacking and integrating a desired number of steel sheets into a one-piece iron core and finally forming the specific shaped groove therein. Accordingly, no gaps are generated in the iron core and the density thereof becomes high even in the case of a sector iron core. Furthermore, the groove formation is conducted as a final step after the integration of the stacked steel sheets. Thus the heat during the welding operation for such an integration has no adverse effect on the groove in the iron core and the problem of lack of magnetic force is solved thereby.

Iron core of electromagnet and method of producing the same

In a superconductive coil having no bobbin in its inside, there is provided a method for producing a superconducting coil having a good cooling ability. The method is characterized in that the superconducting coil is formed around a bobbin, a support cylinder is fitted around the outer periphery of the bobbin and thereafter, the bobbin is removed apart from the coil. A desired prestress may be applied from the support cylinder to the outer periphery of the coil. Therefore, it is possible to improve a thermal conductance and prevent the coil from moving during the superconducting operation.

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Ibaraki-ken, Japan

Katsuhiko Asano