Many reasons are associated with foaming: presence of slowly biodegradable surfactants (eg. The foam can also overflow onto walkways and surrounding areas, posting severe difficulties and risk to operation and environment.Īctivated sludge foaming in aeration tank. It floats and accumulates on top of the tanks, and can take up a large fraction of solids inventory and reactor volume, thus decreasing the effluent quality and control of sludge retention time (SRT). Foam in WWTP is normally sticky, viscous and brown in color. The foam can occur in aeration tank, secondary clarifier, as well as in anaerobic digester. 6.2 Development of Effective Foaming-Control Chemicalsįoaming in activated sludge process is a common operational problem in many wastewater treatment plants. ![]() 6.1 Identification of Filamentous Bacteria.4.2 Cell Surface Hydrophobicity and Exoenzyme Activities.
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February 2023
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