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

Denny Parker¹, Steve Geary, Garr Jones

¹Brown and Caldwell, Walnut Creek, California 94596, USA. Dparker@brwncald.com

Water Environment Research : a Research Publication of the Water Environment Federation

|April 10, 2003

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Classifying selectors prevent nuisance foams in activated sludge plants by removing foam-causing organisms early. This method controls organism populations, improving wastewater treatment efficiency.

Area of Science:

Environmental Engineering
Wastewater Treatment Technologies
Microbial Ecology

Background:

Nuisance foams in activated sludge plants are caused by specific organisms.
Traditional methods may lead to late removal of these foam-causing organisms.
Effective control of foam-causing organisms is crucial for plant efficiency.

Purpose of the Study:

To explain the mechanism and effectiveness of classifying selectors in controlling foam-causing organisms.
To highlight the evolution of classifying selector technology from initial concepts to practical applications.

Main Methods:

Utilizing physical mechanisms within activated sludge systems to selectively remove foam-causing organisms.
Implementing flotation tanks for foam removal in early process stages.

Related Experiment Videos

Adapting designs using aeration, baffling, and adjustable weirs for continuous separation.

Main Results:

Classifying selectors enrich foam-causing organisms into foam solids for rapid removal.
This selective removal maintains low populations of nuisance organisms in the mixed liquor.
Early removal prevents accumulation and late wasting of problematic biomass.

Conclusions:

Classifying selectors offer an effective strategy for managing foam-causing organisms in activated sludge treatment.
The technology has evolved from specialized flotation tanks to integrated aeration-based systems.
This approach optimizes wastewater treatment plant operations by mitigating foam-related issues.