OPTIMUM TEMPERATURE SHIFT FOR NITROBACTER-WINOGRADSKYI - EFFECT OF DISSOLVED-OXYGEN AND NITRITE CONCENTRATIONS

The temperature that maximizes the rate at which Nitrobacter winogradskyi oxidizes nitrite-nitrogen (i. e. the optimum temperature) was shown to have a complicated dependence of ambient dissolved oxygen and nitrite concentrations. In general, the optimum temperature shifted to lower values as dissolved oxygen and nitride concentrations fell. A steep, almost linear drop in optimum temperature with decreasing values of the logarithm of nitrite concentration ws found at dissolved oxygen concentrations above 0. 1 ppm (gm** minus **3) and nitrite-nitrogen concentrations below 10 ppm. A sharp nonlinear drop in optimum temperature with decreasing values of the logarithm of dissolved oxygen concentration occurred at dissolved oxygen concentrations below 1-2 ppm.