Transient Characteristics of Paracoccus denitrificans with Changes between Aerobic and Anaerobi Conditions

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The grown characteristics of Paracoccus denitrificans in both aerobic and anaerobic conditions and in the transient phase from aerobic to anaerobic condition and vice versa were studied in batch and continuous cultures.The growth yield coefficients for glucose and the maximum specific growth rate were 0.59 (g cell/g glucose) and 0.49 (1/hr), and 0.41 (g cell/g glucose) and 0.23 (1/hr) in aerobic and anaerobic conditions, respectively. The nitrate reductase activities in an anaerobi continuous culture were almost constant irrespective of the growth rate and the enzymes were considered to be present in excess. Most of the nitrate reductase activity observed under aerobic conditions using the medium without ammonium chloride was due to the assimilative nitrate reductase. On the transition from anaerobic to aerobic conditions, the nitrate reductase activity was inhibited by the oxygen and the reduction of nitrate was stopped. When the conditions were changed from aerobic to anaerobic the glucose consumtion and the growth stopped for a few hours and the nitrate reductase activity started to increase, however, the initial rapid reduction of nitrate and the accumulation of nitrite were observed. The nitrite reductase activity started to increase after the nitrite accumulated to a high concentration. The high efficiency of nitrogen removal in the single sludge nitrification-denitrification system was considered to be attributed to the initial rapid reduction of nitrate during the transient phase in spite of long adaption lag for denitrification.
公益社団法人日本生物工学会の論文
1980-06-25

Transient Characteristics of Paracoccus denitrificans with Changes between Aerobic and Anaerobi Conditions

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