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Evaluation of Anaerobic/Anoxic/Oxic (A2/O) and Reverse A2/O Processes in Biological Nutrient Removal
A performance comparison between the conventional anaerobic/anoxic/oxic (A2/O) process and the anoxic/anaerobic/oxic (reverse A2/O) process was conducted in lab‐scale at the hydraulic retention time of 0.75 d and solids retention time of 10 d for more than 200 days. Both processes demonstrated excellent removal efficiency for organic matter (> 96%) and total nitrogen (> 85%), with no significant difference in microbial activities, sludge phosphorus (P) content, sludge settling property, and nitrifying community (dominated by Nitrosomonas and Nitrospira). However, there was significant difference in P removal, with the total P removal efficiencies in the reverse A2/O and A2/O systems of 76 ± 6% and 70 ± 6%, respectively. Placing an anoxic stage before the anaerobic stage in the reverse A2/O process resulted in a lower oxidation‐reduction potential (ORP = −268 ± 45 mV) of the anaerobic zone, which contributed to higher P uptake by bacteria under subsequent aerobic respiration.
Evaluation of Anaerobic/Anoxic/Oxic (A2/O) and Reverse A2/O Processes in Biological Nutrient Removal
A performance comparison between the conventional anaerobic/anoxic/oxic (A2/O) process and the anoxic/anaerobic/oxic (reverse A2/O) process was conducted in lab‐scale at the hydraulic retention time of 0.75 d and solids retention time of 10 d for more than 200 days. Both processes demonstrated excellent removal efficiency for organic matter (> 96%) and total nitrogen (> 85%), with no significant difference in microbial activities, sludge phosphorus (P) content, sludge settling property, and nitrifying community (dominated by Nitrosomonas and Nitrospira). However, there was significant difference in P removal, with the total P removal efficiencies in the reverse A2/O and A2/O systems of 76 ± 6% and 70 ± 6%, respectively. Placing an anoxic stage before the anaerobic stage in the reverse A2/O process resulted in a lower oxidation‐reduction potential (ORP = −268 ± 45 mV) of the anaerobic zone, which contributed to higher P uptake by bacteria under subsequent aerobic respiration.
Evaluation of Anaerobic/Anoxic/Oxic (A2/O) and Reverse A2/O Processes in Biological Nutrient Removal
Xu, Shengnan (author) / Bernards, Matthew (author) / Hu, Zhiqiang (author)
Water Environment Research ; 86 ; 2186-2193
2014-11-01
8 pages
Article (Journal)
Electronic Resource
English
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