Osaka Gas Company Limited

Yoshiaki Harada

Kenichi Yamasaki

Yasuhumi Doi

Teizou Okino

Akio Nakashiba

Shigenobu Yurugi

Yoichi Nakanishi

Hajime Fujitani

Nobuhiko Okada

Hiroyuki Matuura

Norio Uedono

Hiroyuki Mathura

Naomichi Kakihara

The invention provides processes for treating waste water comprising subjecting waste water to liquid phase oxidation without catalyst, liquid phase oxidation with catalyst and anaerobic digestion and/or aerobic treatment.

Process for treating waste water

Waste water containing at least two kinds of components among suspended solids, ammonia and chemically oxidizable substances is treated in a liquid phase oxidation in the presence of a catalyst supported by a carrier of honeycomb construction.

Process for treating waste water by wet oxidations

This invention provides a process for treating ammonium nitrate-containing waste water which comprises subjecting the waste water to wet thermal decomposition in the presence of a catalyst supported by a carrier and containing as an active component at least one of precious metals and compounds thereof insoluble or sparingly soluble in water while maintaining the waste water at a pH of about 3 to about 11.5 and a temperature of about 100.degree. to about 370.degree. C.

Process for treating ammonium nitrate-containing waste water

This invention relates to a process by which waste water containing ammonia or chemically oxidizable substances (hereinafter referred to as 'COD components'), suspended solids, etc. in addition to ammonia is subjected to wet oxidation in the presence of a catalyst to convert these pollutants to nitrogen, carbon dioxide, water and the like and to thereby render the waste water harmless. According to this invention, the ammonia contained in the waste water includes ammonium compounds which liberate ammonium ions when dissociated in water. The COD components include phenol, cyanides, thiocyanates, oils, thiosulfuric acid, sulfurous acid, sulfides, nitrous acid, etc.

A process for treating ammonia-containing waste water which comprises subjecting the ammonia-containing waste water to wet oxidation with an oxygen-containing gas in the presence of a catalyst while maintaining the waste water at a temperature of 100 to 370.degree. C. and at pressure permitting the waste water to remain in the liquid phase, the catalyst comprising at least one of iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, platinum, copper, gold, tungsten and water-insoluble compounds thereof.

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Tsuzuki, Japan

Yoshiaki Harada