Sphaerotilus natans

…They are also called sheath bacteria. The representative species is Sphaerotilus natans Kützing, which occurs in wastewater from paper or livestock factories, and is also called sewage bacteria or sewage iron bacteria. They mostly occur as fuzzy gray-brown clumps on the banks or bottoms of slow-flowing rivers where wastewater has flowed into them and become somewhat diluted. They also often occur in activated sludge, forming thread-like clumps that impair the settling properties of the activated sludge. …

*Some of the terminology that mentions "Sphaerotilus natans" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…菌鞘細菌ともいう。Sphaerotilus natans Kützingが代表種で，製紙あるいは畜産工場から流れ出る廃水中に発生するもので，汚水細菌または汚水の鉄細菌ともよばれる。多くは廃水が河川に流入して幾分うすまったゆるい流れの岸や底に，もやもやした灰褐色の集塊として発生し，また活性汚泥によく発生し，糸状の集塊を生じて活性汚泥の沈降性を悪くする。…

※「Sphaerotilus natans」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報