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Optimization of Wastewater Phosphorus Removal in Winter Temperatures Using an Anaerobic–Critical Aerobic Strategy in a Pilot-Scale Sequencing Batch Reactor

College of New Energy and Environment, Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130012, China
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Water 2020, 12(1), 110; https://doi.org/10.3390/w12010110
Received: 8 December 2019 / Revised: 25 December 2019 / Accepted: 27 December 2019 / Published: 29 December 2019
(This article belongs to the Section Wastewater Treatment and Reuse)
Biological phosphorus removal using an anaerobic–aerobic sequencing batch reactor (SBR) in a low temperature can be difficult to remove, and aeration always accounts for nearly half of the total electricity costs at many wastewater treatment plants. In this study, a pilot-scale anaerobic–critical aerobic SBR (A–CA SBR) was developed for synthetic domestic wastewater. More importantly, the phase, whose concentration of diffused oxygen was controlled at 1.0–1.5 mg/L, was defined as a critical aerobic phase, which reduced expenses during the operation. To be specific, half of the ammonia was removed within 10 days and no NO3–N was accumulated during the process. From the SEM and metagenome analysis, Rhodocyclus, Zooglea, Dechloromonas, and Simplicispira had the ability to remove phosphorus and NO3–N simultaneously, which proved the existence of a potential double-layer sludge structure under an A–CA operational condition. All of the results disclose that the pilot-scale A–CA SBR is a reliable manipulation strategy for phosphorus removal under low temperatures, which can hopefully apply to practical wastewater remediation. View Full-Text
Keywords: pilot-scale anaerobic–critical aerobic SBR; winter temperature; phosphorus removal; metagenome analysis pilot-scale anaerobic–critical aerobic SBR; winter temperature; phosphorus removal; metagenome analysis
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MDPI and ACS Style

Liu, M.; Yao, B.; Cong, S.; Ma, T.; Zou, D. Optimization of Wastewater Phosphorus Removal in Winter Temperatures Using an Anaerobic–Critical Aerobic Strategy in a Pilot-Scale Sequencing Batch Reactor. Water 2020, 12, 110.

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