AERATION BASIN/SECONDARY CLARIFIER SOLIDS DISTRIBUTION: A KEY TO SUCCESSFUL ACTIVATED SLUDGE DESIGN AND OPERATION
The interaction between the aeration basin and secondary clarifier play a critical role in the operation of activated sludge systems. Although popular in the design and operation of the activated sludge system, flux theory and the state point analysis (SPA) technique demonstrate theoretical and practical limitations in application. This paper, after presenting a discussion of these limitations, presents results from a technique for the design and operation of secondary clarifiers in the activated sludge system which considers the compression of the biological solids. The application of this technique permits the development of secondary clarifier solids distribution diagrams to guide the system designer and operator in minimizing the solids resident in the secondary clarifier. The paper then applies these diagrams to demonstrate the effect of return activated sludge ratio and aeration basin/secondary clarifier volume ratio on the design and operation of the activated sludge process.
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Document Type: Research Article
Publication date: 2005-01-01
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