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The study demonstrated that citric acid, as an organic carbon source, can improve denitrification in Anaerobic Sequencing Batch Biofilm Reactor (AnSBBR). The consumption rate of the organic substrate and the denitrification rate were lower during the period of the reactor's acclimatization (cycles 1–60; 71.5 mgCOD L−1 h−1 and 17.81 mgN L−1 h−1, respectively) than under the steady state conditions...
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