Ngk Insulators, Inc.

Naoki Murata

Nobuhiro Aoki

Hitoshi Yonekawa

Mitsuo Kawase

Hiroyuki Oyachi

Tadashi Nomura

A flush mixing tank is provided with a flocculant mixing section in which a raw water a to be treated is introduced and a flocculant such as known aluminum sulfate or polychlorinated aluminum is injected, and then they are agitated and mixed; and a floc growing section through which flocculant injected water mixed with the flocculant passes, and the flocculant injected water is discharged as a floc treated water, but a water passing member, which is provided with a plurality of water through-holes for promoting the growth of the flocs in the flocculant injected water, is disposed in the floc growing section. Flocs of flocculant injected water can be rapidly formed, and growth of the flocs can be accelerated.

Flocculation apparatus

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.

Filtering method

Proliferation activity of methane bacteria in organic waste water can be improved by maintaining the ratio of the amounts of nickel, iron and cobalt contained in the waste water to the BOD thereof to not lower than certain values, and various organic waste waters, such as waste liquor formed during the production of beer and the like, can be treated in a high BOD removal ratio of not lower than 90% while maintaining a high BOD load of not lower than 10 kg/m.sup.3 .multidot.day.

Growing community of inventors

Nagoya, Japan

Naoki Murata