Kurita Water Industries Ltd.

Chemical Grouting Company, Ltd.

Front Engineering Co. Ltd.

Sanyo Chemical Industries, Ltd.

Shoesangyo Corporation

Shoeisangyo Corporation

Sotoo Kubo

Shin Suzuki

Masami Yoda

Isao Yamaki

Kaoru Ishizuka

Masahiro Iji

Toshikuni Hashimoto

Takashi Suzuki

Motohiko Ii

Yoshio Goto

Sludge which is supplied from an untreated sludge tank 3 and diluting water from a diluting water supply facility 14 is charged into a continuous kneading mixer 12 for diluting the sludge to make the specific weight of the sludge 1.15 to 1.35. The diluted sludge is supplied to a dehydrating machine 25 in accordance with the capacity of the used dehydrating machine 25. The diluted sludge is firstly added with an inorganic flocculating agent G and is mixed in a first blender 24A and is then added with a high molecular flocculating agent G2 and is mixed in a second blender 24B. Thereafter, the sludge is supplied to a belt press dehydrating machine 25 in which it is subjected to a dehydrating treatment.

Process for treating sludge and system for the same

A water treating agent which comprises a specific polymer containing a structural unit that is derived from a monomer having an ethylenically unsaturated bond and has one or more carboxyl radicals, at least a part of said carboxyl radicals being modified, or another water treating agent which comprises, in addition to said specific polymer, one or more compounds selected from the group consisting of inorganic phosphates, phosphonic acids, organic phosphoric acid esters and polyvalent metal salts, is capable of preventing the formation of corrosion, scale and contamination on the surface of a metal that is in contact with water.

Water treating process

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Tokyo, Japan

Sotoo Kubo