Optimization of Wastewater Phosphorus Removal in Winter Temperatures Using an Anaerobic–Critical Aerobic Strategy in a Pilot-Scale Sequencing Batch Reactor
Meijun Liu | Bing Yao | Shibo Cong | Taigang Ma | Donglei Zou
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 NO<sub>3</sub><sup>−</sup>−N was accumulated during the process. From the SEM and metagenome analysis, <i>Rhodocyclus, Zooglea, Dechloromonas</i>, and <i>Simplicispira</i> had the ability to remove phosphorus and NO<sub>3</sub><sup>−</sup>−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.
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