A Comparison of pH-controlled and Dissolved Oxygen-controlled Nutrient Addition for the Maintenance of Steady-state in a Mixed Continuous Culture |
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Authors: | K. ROBINSON D. FENLON |
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Affiliation: | Bacteriology Division, School of Agriculture, 581 King Street, Aberdeen, Scotland |
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Abstract: | Controlled substrate addition was used to maintain mixed microbial cultures in fermenters at either pH 7.0 or 70% dissolved oxygen saturation. Control of pH permitted a greater volume of substrate to be processed. Ammonium nitrogen concentrations were similar for both fermenters but concentrations of oxidized nitrogen varied. Nitrification/denitrification sequences appeared to be initiated by unscheduled changes in dissolved oxygen concentration. It was possible to maintain a steady state with respect to a controlled parameter and end-product quality but other parameters fluctuated. |
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