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- W19902992 abstract "The response of a laboratory scale activated sludge system to an inhibitory substrate, phenol, was studied using oxygen uptake rate, which proved to be a rapidly responding and easily measurable metabolic activity parameter. This parameter was used in the design of a control strategy to manipulate the flow rate of the inhibitory substrate feed stream in such a manner that the substrate uptake rate could be maintained near maximum under conditions of changing inlet concentration and reaction biomass. Measurements of oxygen uptake rate as a function of inhibitory substrate concentration indicated that oxygen uptake rate depended on the adaptation of the culture to the substrate, in this case phenol. For partially and fully adapted systems, oxygen uptake rate increased rapidly as the substrate concentration increased till the maximum was reached at ca. 4 mg/lt. Further increases in substrate concentration led to a linear decrease in oxygen uptake rate to a maximum inhibition level at 300 mg/lt. Since inhibitory effects occurred at low phenol concentrations, stopping the phenol flow rate upon detection of inhibition led to rapid consumption of accumulated phenol. System recovery could be detected by a sudden peak in oxygen uptake rate, which occurred when the phenol concentration approached zero. Two strategies for controlling the feed flow rate were developed: one utilizing a process mass balance model with constant yield coefficient, and the other utilizing an adaptive-questing strategy to manipulate the feed rate according to trends in the oxygen uptake rate. The second strategy proved to be superior and the reactor could be controlled under conditions of changing feed concentrations, so that nearly maximum uptake rates were achieved." @default.
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- W19902992 date "1983-08-01" @default.
- W19902992 modified "2023-09-26" @default.
- W19902992 title "Experiments with an Adaptive-Questing Computer Control Strategy for the Biological Oxidation of Inhibitory Substrates" @default.
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- W19902992 doi "https://doi.org/10.1016/s1474-6670(17)61988-8" @default.
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