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Single-Reactor Nitritation for High Strength Landfill Leachate Treatment
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- Author / Creator
- Guan, Roy Chunsheng
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Nitrogen is an important component for our ecosystems, which accounts for 80% of chemical elements in the atmosphere. Ammonia nitrogen is one of the most concerned constituents for the environment. The municipal wastewater contributes the greatest amount of nitrogen into surface water and groundwater in Canada. The landfill leachate could consist of 40-50% of the total amount of nitrogen but with only 1% of the flow in the influent in WWTPs. To meet the more stringent discharge standards for nitrogen in water, highly reliable, stable and cost saving nitrogen removal technologies should be evaluated. The conventional nitrogen removal process nitrification-denitrification has been widely implemented in mainstream treatment. Comparingly, nitritation-denitritation can achieve cost reductions as 25% on aeration and 40% on external carbon demand respectively.
The ammonia-rich landfill leachate with efficient alkalinity is satisfying for the single reactor nitritation process. In this study, an aerobic granular sludge (AGS) reactor was operated in sequencing batch mode at 21℃. The purpose of this thesis is to investigate the feasibility and stability of single reactor nitritation for treating ammonia rich landfill leachate, also analyze the distributions of microbial community and predominant microbes that conduct the nitritation process. After shortening hydraulic retention time (HRT) to 7 hours, the nitritation reactor accomplished the stable ammonia nitrogen removal rate at 99% for more than 100 days. The dominant nitrifying genera was identified as Nitrosomonas. The relative abundance showed an increasing trend after long-term operation.
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- Subjects / Keywords
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- Graduation date
- Spring 2024
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.