Nitrogen Removal Characteristics in a Biofilm System for Recirculating Aquaculture Wastewater Treatment under High-Salinity Conditions and Oligotrophic Stress
Publication: Journal of Environmental Engineering
Volume 146, Issue 7
Abstract
This study evaluated nitrogen removal characteristics in a biofilm system for recirculating aquaculture wastewater treatment with different carriers and aeration modes under salinity conditions () and oligotrophic stress (total organic ). The results demonstrated that the nitrification process was inhibited at a high salinity concentration of , and an ammonia oxidation efficiency greater than 80% required 45 days but resulted in high nitrite accumulation. No significant differences in ammonia oxidation and denitrification efficiencies were found between the polypropylene and polyurethane foam carriers, whereas compared with the polyurethane foam carrier, the polypropylene carrier with a higher aeration duration of 6 h in Phase 2 needed less time (99 days) for the acclimatization of complete nitrification. However, no denitrification efficiency was found with full-time aeration, and the highest denitrification efficiency was with no aeration. Poor denitrification performance was mainly due to oligotrophic stress from carbon source deficiency, and an efficient denitrification efficiency of was achieved with the addition of biodegradable polycaprolactone (PCL).
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The work was supported by the National Natural Science Foundation of China (No. 51709236) and the Project supported by the Open Foundation from Marine Sciences in the First-Class Subjects of Zhejiang (No. 20190000).
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Published In
Journal of Environmental Engineering
Volume 146 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jun 14, 2019
Accepted: Dec 3, 2019
Published online: Apr 27, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 27, 2020
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