Unitika Ltd.

Daitoh Knit Co., Ltd.

Kohtoku Industrial Waste Management Incorporation

Hiroyuki Uejima

Masahide Hirai

Masahiro Kazigase

Tsutomu Sakaida

Minoru Takewaki

A method for treating used human-waste disposal materials, containing a highly water-absorbent polymer, that have absorbed the water content of human waste. Such used materials are treated with an aqueous solution of an alkaline earth metal salt, such as calcium or magnesium, and then mechanically dehydrated. With this dehydrating method, the water content of used disposable paper diapers can be reduced efficiently and at low cost. This makes the dehydrated human-waste disposal material, such as disposable paper diapers, to be easily disposed of by incineration or other appropriate post-treatment means, or to be used effectively as an organic fertilizer.

Method for dehydrating human-waste disposal materials

An etherified phenolic chelate resin prepared by stabilizing and protecting the chelate groups of a phenolic chelate resin and then converting some or all of the phenolic hydroxyl groups into either groups; a process for the production of the etherified phenolic chelate resin; and a method for separating a heavy metal ion from an aqueous solution having a pH of at least 7 by using this etherified phenolic chelate resin.

Process for removing heavy-metal ions from aqueous solution

An etherified phenolic chelate resin prepared by stabilizing and protecting the chelate groups of a phenolic chelate resin and then converting some or all of the phenolic hydroxyl groups into ether groups; a process for the production of the etherified phenolic chelate resin; and a method for separating a heavy metal ion from an aqueous solution having a pH of at least 7 by using this etherified phenolic chelate resin.

Etherified phenolic chelate resin, process for its production, and

A phenolic chelate resin comprising the three-dimensional product obtained by cross-linking a phenolic compound represented by the general formula (I): ##STR1## (wherein M is an alkali metal atom, an ammonium group, or a hydrogen atom, and R.sub.1 and R.sub.2, which may be the same or different, each is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms) with a phenol and an aldehyde. The phenolic chelate resin selectively adsorbs ferric ion and/or cupric ion in an acidic aqueous solution at a pH of 3 and less.

Growing community of inventors

Nara, Japan

Hiroyuki Uejima