Dissolved oxygen control and simultaneous estimation of oxygen uptake rate in activated-sludge plants

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Abstract:

The theoretical basis, practical implementation, and experimental validation of an on–off control strategy for dissolved oxygen (DO) in aerobic reactors of pilot-scale activated-sludge plants with simultaneous estimation of oxygen uptake rate are presented. The effect of dead time and a long response time for robust DO probes has been carefully analyzed and corrected through modeling of the dynamic response of the sensor. Study results indicate that the amplitude of the control band depends on the dead time of the probe. Simultaneous estimation of the volumetric mass-transfer coefficient for DO (KLa) permits a continuous check of the aeration equipment. Experimental validation has been achieved in a continuous pilot-scale plant.

Keywords: ACTIVATED SLUDGE; CONTROL STRATEGIES; DISSOLVED OXYGEN; MODELING; MONITORING; OXYGEN UPTAKE RATE; PROBES

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143098X124948

Publication date: May 1, 1998

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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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