Denitrifying Bacterium which Gives High Activity at Low Temperature (2)

Effect of No^-₂-N on Bacterial Denitrification at Different Temperature

Abstract

The effect of NO^-₂-N on the denitrification by N-1 strain at different temperatures was investigated.
The additional dosage of NO^-₂-N in the course of denitrification gave no effect on the removal rate of NO^-₃-N. When NO₂-N was contained in medium, the denitrification was greatly inhibited at 5°C, but it was not heavily inhibited at 10°C. Aerobic growth of N-1 strain was inhibited by 2 mM NO^-₂-N at 5°C, while 7 mM NO^-₂-N gave no effect at 10°C. The results of the denitrification using the resting cells indicated that N-1 strain produced unknown factors which stimulated the denitrification in the filtrate of anaerobic culture solution.