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A Comparison of pH‐controlled and Dissolved Oxygen‐controlled Nutrient Addition for the Maintenance of Steady‐state in a Mixed Continuous Culture
Author(s) -
ROBINSON K.,
FENLON D.
Publication year - 1977
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1977.tb00707.x
Subject(s) - ammonium , oxygen , steady state (chemistry) , nitrification , chemistry , nitrogen , substrate (aquarium) , nutrient , saturation (graph theory) , volume (thermodynamics) , denitrification , oxygen saturation , environmental chemistry , inorganic chemistry , pulp and paper industry , ecology , organic chemistry , biology , thermodynamics , physics , mathematics , combinatorics , engineering
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.