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Abstract

Oxygen transfer capacity is of paramount importance for an aerobic bioreactor because it is a bottleneck of aerobic processes. In this study, the evaluation of oxygen transfer characteristics was carried out under different working conditions by employing a new pilot-scale internal-loop airlift bioparticle (ILAB) reactor, which was fabricated specifically for simultaneous partial nitrification (PN) and anaerobic ammonia oxidation (ANAMMOX). Results showed that as for tap water, the oxygen transfer rate (OTR) was 138.24 mg/min and the aeration efficiency was 30.21% at the airflow rate of 1.0 m³/h. As for the ammonia-bearing wastewater, the OTR was 147.21 mg/min and the aeration efficiency was 40.21% at the airflow rate of 0.8 m³/h. The ILAB reactor easily met the aeration requirements (4.540 mg/L·min) at nitrogen loading rate (NLR) of 5.44 kg·N/m³·day, which is reported as the maximum so far in the literature, and satisfactorily allows the trial of NLR higher than the maximum value (5.44 kg·N/m³·day). At different airflow rates, estimated values of alpha and beta factors were in the range of 0.69 to 1.2 and 0.98 to 1.0, respectively. The study highlighted the fact that bottleneck of single-stage PN-ANAMMOX, oxidation of ammonia to nitrite, can be eliminated by designing a proper reactor and aerator.

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Oxygen Transfer Characteristics in a Pilot-Scale Airlift Internal-Loop Bioreactor for Simultaneous Partial Nitrification and Anaerobic Ammonia Oxidation

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