Dynamic Characterization of Paracoccus denitrificans in Alternate Aerobic-anaerobic Continuous Cultivations

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The alternate aerobic-anaerobic continuous culture system was used to analyze the adaptaiton phenomena of Paracoccus denitrificans quantitatively, which will be observed in a single sludge nitrification-denitrification system. After the initial rapid reduction of nitrate in the anaerobic, period, arather high rate of nitrate reduction was maintained. The lag of adaptation to each condition was short and this was explained by the presence of large amounts of the cytochromes and enzymes required for both aerobic and nitrate/nitrite respirations. When the alternation cycle of aerobic and anaerobic conditions was short, the nitrate concentration was lower than that in anaerobic continuos cultures at the same dilution rate. The apparent specific rate of nittrate reduction was almost the same as that in anaerobic continuous clutires when the alternation cycle was short. On the other hand, the nitrite accumulated at high concentrations and the apparent specific rate of nitrite reduction was very low. The actual reduction rate of nitrate in the anaerobic periods was found to be unaffected by the length of the aerobic periods, however, the actual reduction rate of nitrite was highly affected by the aerobic periods. By considering the initial rapid reduction of nitrate in the alternate aerobic-anaerobic system, it was suggested that the higher recycling ratio which corresponds to the shorter alternation cycle, was effective in increasing the efficiency of nitrogen removal in the single sludge nitrification-denitrificaiton sysytem.
公益社団法人日本生物工学会の論文
1980-06-25

Dynamic Characterization of Paracoccus denitrificans in Alternate Aerobic-anaerobic Continuous Cultivations

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