Effect of Reflux Ratio on Performance of Pyrite-Based Mixotrophic Sequencing Batch Biofilm Reactor Treating Real Domestic Wastewater
Publication: Journal of Environmental Engineering
Volume 150, Issue 10
Abstract
The influent of municipal wastewater treatment plants (WWTPs) in China is generally facing the problem of insufficient carbon sources. Pyrite-based autotrophic denitrification (PAD), which uses pyrite as an electron donor, has good advantages of less acid production, low sulfate generation, and efficient simultaneous nitrogen and phosphorus removal from wastewater. In this study, a novel type of mixotrophic sequencing batch biofilm reactor (SBBR) was constructed by combining PAD with SBBR, and the effect of reflux ratio on the treatment efficiency of pyrite-based SBBR was studied. The research showed that the addition of reflux improved the removal capability of nitrogen and phosphorus, and the optimal reflux ratio for the pyrite-based SBBR was 200% when the removal rates of , , TN, and reached , , , and , respectively in the anoxic environment with pH 7–8. The variation of pollutants in the typical operating cycle showed that most of the organic pollutants were removed in the aerobic stage. The analysis of extracellular polymeric substances (EPS) further verified that the addition of reflux was beneficial to the removal of nitrogen and phosphorus.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was financially supported by the Open Research Program from the Key Laboratory of Genetic Breeding and Cultivation for Freshwater Crustacean, Ministry of Agriculture and Rural Affairs (FC2023-07), and the earmarked fund for Jiangsu Agricultural Industry Technology System.
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Published In
Journal of Environmental Engineering
Volume 150 • Issue 10 • October 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Dec 6, 2023
Accepted: May 23, 2024
Published online: Aug 5, 2024
Published in print: Oct 1, 2024
Discussion open until: Jan 5, 2025
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