廃水処理装置

Waste water treating equipment

Abstract

(57)【要約】 【目的】 曝気槽で生物処理された水を受け入れて汚泥 を沈澱する沈澱槽では微量の汚泥が嫌気性となってスカ ムとして発生ガスと共に浮上し、上澄水に混入して流出 し、処理水の水質を低下させているが、本発明はそのよ うなスカムの流出を防ぎ、処理水質の向上を図ったもの である。 【構成】 沈澱槽内の水面にホテイアオイなどの浮上性 草類を置き、浮上してきたスカムを該草類の根に付着、 固定し、それによりスカムが上澄水と共に流出するのを 防いでいる。従って、浮上性草類の根が濾材の役割を果 す。根に付着したスカムは溶存酸素に接触して好気性と なり、再び沈降して他の沈降汚泥と共に排出される。
PURPOSE: To enhance quality of treated water by preventing discharge of scum being anaerobic trace sludge which floats up with gas generated in a precipitation tank for introducing water biologically treated in an aeration tank to precipitate sludge and is mixed with supernantant liquor, discharged away and deteriorates the quality of treated water. CONSTITUTION: Floating grasses 20 such as a water hyacinth are placed on the water surface in a precipitation tank 10. Floated up scum is stuck and fixed to the roots of grasses 20. Thereby scum is prevented from being discharged away together with supernatant liquor. Therefore the roots of the floating grasses 20 fill the role of a filter medium. Scum stuck to the roots is brought into contact with dissolved oxygen and made aerobic, resettled and discharged together with the other settled sludge. COPYRIGHT: (C)1993,JPO&Japio

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