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Sludge Age, Stability, and Safety Factor for the Biofilm‐Activated Sludge Process Reactor

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The average sludge age (c) of the activated sludge process (ASP)‐biofilm were developed and verified experimentally. In addition, the stability and safety factor were investigated against c through a series of curves. These curves are important to explain, in concept, the function of the hybrid system under different values of c. The proposed curves of this study are simple and can be modified for any specified wastewater. The definition of c of ASP was found to be applicable to the hybrid system after including the biofilm. A ratio ranging from 70 to 80% of the total mass of biofilm may be used in the definition of c to give close results with the experimental values. Furthermore, the minimum sludge age (M c ) does not exist in the hybrid reactor because of the presence of biofilm; however, c should come down to a critical value under some specific conditions of the reactor.

Keywords: activated sludge; biofilm; hybrid reactor; sludge age; stability; wastewater

Document Type: Research Article


Publication date: June 1, 2012

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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