Seitetsu Kagaku Co., Ltd.

Hiroo Tsuchiya

Saburo Hayashi

Kazuo Haruna

Masahiro Inoue

Takeo Tanabe

Mitsukazu Mukai

Akira Otsuji

A process for the removal and recovery of mercury and, if desired, other heavy metals from incinerator waste water produced by washing waste gases from incinerators, which comprises adding to the waste water a reducing agent or a combination of oxidizing and reducing agents, subjecting the thus added waste water to stripping treatment in the presence of ferrous ion to obtain a mercury vapor-containing gas and simultaneously form spinel type crystalline compounds and then cooling said gas to separate and recover the mercury. If desired, said spinel type crystalline compounds are also removed from the mercury-free waste water.

Process for removal of mercury from waste water

A process for obtaining high concentration argon from air by means of pressure-swing-adsorption, characterized by passing air through a zeolite molecular sieve-packed adsorption apparatus and a carbon molecular sieve-packed adsorption apparatus in this order, subjecting the air to pressure-swing-adsorption operation independently in the above pieces of adsorption apparatus, thereby obtaining concentrated argon and high purity oxygen simultaneously.

Process for obtaining high concentration argon by

Growing community of inventors

Kakogawa, Japan

Hiroo Tsuchiya