Making classifying selectors work for foam elimination in the activated-sludge process

Classifying selectors are used to control the population of foam-causing organisms in activated-sludge plants to prevent the development of nuisance foams. The term, classifying selector, refers to the physical mechanism by which these organisms are selected against; foam-causing organisms are enric...

Ausführliche Beschreibung

Bibliographische Detailangaben
Veröffentlicht in:	Water environment research : a research publication of the Water Environment Federation. - 1998. - 75(2003), 1 vom: 15. Jan., Seite 83-91
1. Verfasser:	Parker, Denny (VerfasserIn)
Weitere Verfasser:	Geary, Steve, Jones, Garr, McIntyre, Lori, Oppenheim, Stuart, Pedregon, Vick, Pope, Rod, Richards, Tyler, Voigt, Christine, Volpe, Gary, Willis, John, Witzgall, Robert
Format:	Aufsatz
Sprache:	English
Veröffentlicht:	2003
Zugriff auf das übergeordnete Werk:	Water environment research : a research publication of the Water Environment Federation
Schlagworte:	Journal Article Sewage Surface-Active Agents

Beschreibung
Zusammenfassung:	Classifying selectors are used to control the population of foam-causing organisms in activated-sludge plants to prevent the development of nuisance foams. The term, classifying selector, refers to the physical mechanism by which these organisms are selected against; foam-causing organisms are enriched into the solids in the foam and their rapid removal controls their population at low levels in the mixed liquor. Foam-causing organisms are wasted "first" rather than accumulating on the surface of tanks and thereby being wasted "last", which is typical of the process. This concept originated in South Africa, where pilot studies showed that placement of a flotation tank for foam removal prior to secondary clarifiers would eliminate foam-causing organisms. It was later simplified in the United States by using the aeration in aeration tanks or aerated channels coupled with simple baffling and adjustable weirs to make continuous separation of nuisance organisms from the mixed liquor
Beschreibung:	Date Completed 25.06.2003 Date Revised 22.09.2019 published: Print Citation Status MEDLINE
ISSN:	1554-7531