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Anaerobic digester foaming has often plagued operators of wastewater treatment plants (WWTPs). Due to the complexity of the problem and the variables involved, it is often difficult to correctly identify the cause of the foaming. Foaming in conventional anaerobic digesters has been
attributed to a number of causes from inadequate mixing to Nocardia bacteria carried over from the secondary treatment process. However, causes identified in the literature can be grouped into three main categories. Each of which are discussed separately with their respective solutions. Foaming
in advanced digestion processes has not been well studied, and is a complex problem at WWTPs and can be caused by a variety of factors or combination of factors. Informal interviews were conducted with several municipalities regarding anaerobic digester foaming occurrences and operational
strategies to deal with the problem. No universal solutions were found, but site- and system-specific solutions were common. The paper also includes recommendations for designers of digestion systems and a decision-tree for operators dealing with foaming problems.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.