National Tax Administration Agency

Kibun Company Limited

Toho Zinc Co., Ltd.

The Hokuren Federation of Agricultural Cooperative Associations

Toh Zinc Company Limited

Kikuo Nojiro

Kiyoshi Yoshizawa

Kazuo Horii

Hiroshi Kiuchi

Masamitsu Itoh

Katsuyoshi Mitsutomi

Takeo Koizumi

Hiroshi Hashimoto

Kenichi Otsuka

Seiji Nakamura

Kazuo Tanno

Akira Noguchi

Newly isolated yeasts assimilating a high amount of protein are added to a waste water rich in protein thereby making such yeasts assimilate protein, so that the B.O.D. of the waste water is efficiently decreased.

Method of treating a waste water rich in protein

Distillers solubles are purified by a centrifugal separation to a degree above 50,000 which is the product of g x minute, or a filtration with addition of a filter aid. The clarified matter is purified by a molecular sieve ultrafiltration treatment, reverse osmosis or an organic solvent precipitation. The clarified matter or purified matter thus obtained is pulverized by spray drying, lyophilic drying or air drying. Said clarified matter, purified matter or pulverized matter is added to a fermentation medium or a feed as an available component.

Method of purifying distillers solubles and use of the purified matter

Distillers solubles are purified by a centrifugal separation to a degree above 50,000, which is the product of g.times.minute, or a filtration with addition of a filter aid. The clarified matter is purified by a molecular sieve treatment, ultrafiltration, reverse osmosis or an organic solvent precipitation. The clarified matter or purified matter thus obtained is pulverized by spray drying, lyophilic drying or air drying. Said clarified matter, purified matter or pulverized matter is added to a fermentation medium or a feed as an available component.

Distillers solubles are purified by a centrifugal separation to a degree above 50,000, which is the product of g .times. minute, or a filtration with addition of a filter aid. The clarified matter is purified by a molecular sieve treatment, ultrafiltration, reverse osmosis or an organic solvent precipitation. The clarified matter or purified matter thus obtained is pulverized by spray drying, lyophilic drying or air drying. Said clarified matter, purified matter or pulverized matter is added to a fermentation medium or a feed as an available component.

Newly isolated polysaccharide assimilating yeasts are added to a waste water rich in nutrients thereby making such yeasts assimilate nutrients, so that B.O.D. of the waste water is efficiently decreased. Among the polysaccharide assimilating yeasts, ellipsoideus YS-1, FERM-P No. 4498, in particular, can decompose and assimilate sulfurous acid, starch and protein at once, and therefore the B.O.D. of the waste water from starch production plants can be considerably decreased.

Treatment of waste water rich in nutrients

Growing community of inventors

Machida, Japan

Kikuo Nojiro