Ngk Insulators, Inc.

Metawater Co., Ltd.

Hiroyuki Oyachi

Kiyotaka Sugiura

Nobuhiro Aoki

Hideki Takeuchi

Satoru Mima

Hitoshi Yonekawa

Naoki Murata

Kohji Hattori

Sadamitsu Shiode

A method of removing soluble manganese includes: a mixing step of mixing water for treatment, activated carbon micropowder having an average particle size of not less than 0.1 &#x3bc;m and not more than 10 &#x3bc;m, and an oxidizing agent to obtain a water/activated carbon mixture; and a membrane filtration step of membrane filtering the water/activated carbon mixture to obtain treated water.

Method of removing soluble manganese

A filtration device is provided having a large number of filters, each comprising a filter element and a casing. The device includes filter strings constructed so that a plurality of filters are connected in a row by header tubes, at least two rows of filter strings are further connected in parallel by a filtrate recovery collecting tube, and the filtrate recovery collecting tube is placed at a higher position than the filtrate recovery header tubes.

Filtration device

The present invention provides an upward-flow manganese contact column for feeding raw water to a manganese catalyst-packed layer through a plurality of dispersion nozzles provided at the upper surface of a chamber by forming the chamber for allowing raw water to flow in at the bottom of a column body into which a granular manganese catalyst is packed. Each dispersion nozzle has an umbrella portion above a perpendicular nozzle body, and the umbrella portion is configured so that the lower end of the umbrella portion is elongated below the upper end of the nozzle body. Raw water is supplied to the entire manganese catalyst-packed layer from the lower end of the umbrella portion of each dispersion nozzle. It is capable, of exhibiting stable treatment ability for a long time by suppressing particles of the manganese catalyst from being worn by collisions of the particles.

Upward-flow manganese contact column

The filterof the present invention has at least two filter elementscontained in the casing, which are connected in series in such a state as interposing the first sealerbetween them.

Filter and filter module

A filtering method including the steps of preparing a water purifying apparatuswith a cell structurehaving units for constituting cell structure, and a cap portion, and making raw water flow into cellsfrom one end, and filtered by a partition wallsto take out filtrate water from the side of an outer peripheral surface. The cell structureis so constructed that the ratio of maximum value to minimum value in water permeability among the partition wallsprovided therein is within a range from of 110 to 300% in terms of percentage, and the cellslocated on the side of an outer peripheryof the cell structurehave a greater water permeability.

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Handa, Japan

Hiroyuki Oyachi