Simultaneous Nitrification and Denitrification in a Rotating Biological Contactor,
MIYAZAKI UNIV (JAPAN) DEPT OF CIVIL ENGINEERING
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The phenomenon of Simultaneous Nitrification and Denitrification in a RBC process was confirmed by measuring nitrogen gas production. The SND in a RBC was experimentally studied in terms of mean residence time, organic loading, water temperature, and the partial pressure of oxygen in the air phase. Most of the conventional biological processes for nitrogen removal consist of a series of unit processes which perform organic oxidation, nitrification, and denitrification separately. On the other hand, in the case of nitrogen removal using the RBC nitrification process, all the organic oxidation, nitrification, and denitrification could be accomplished in the same reactor. The obtained results are summarized as follows 1 In a closed RBC for nitrification, nitrogen gas increased in the air phase, while oxygen gas decreased. 2 The nitrogen removal rate due to SND depended upon the MRT, CN ratio, water temperature, partial pressure of oxygen, and ammonia concentration. When the other parameters were fixed, the optimum CN ratio existed for the maximum nitrogen removal rate due to SND. 3 The SND patterns were classified into three types depending on the experimental conditions.