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Modification of a Full‐Scale Sequencing Batch Reactor Operational Mode for Biological Nutrient Removal
Author(s) -
Ersu Cagatayhan,
Arslankaya Ertan,
Ong Say Kee,
Fox David,
Aldrich Lance,
Copeman James
Publication year - 2008
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143007x221337
Subject(s) - effluent , phosphorus , anoxic waters , chemistry , sequencing batch reactor , nitrogen , biochemical oxygen demand , wastewater , chemical oxygen demand , nutrient , anaerobic exercise , environmental chemistry , environmental engineering , pulp and paper industry , environmental science , biology , organic chemistry , physiology , engineering
Two biological nutrient removal modes, consisting of anaerobic, anoxic, and oxic sequences, were tested in a full‐scale sequencing batch reactor. The modes, identified as BNR‐S1 and BNR‐S2, had average total nitrogen removals of 84 and 89%, respectively, for the months of August to October. Over the same period, total phosphorus removals for BNR‐S1 and BNR‐S2 were 88 and 87%, respectively. In contrast, total nitrogen and total phosphorus removals for the regular aerobic mode were 54.7 and 44.7%, respectively. When the wastewater temperature changed from approximately 20 to 15°C in the winter months, total nitrogen and total phosphorus removals for BNR‐S2 were reduced to 81 and 70%, respectively. Total nitrogen effluent concentrations were between 2.5 and 4 mg‐N/L (at approximately 20°C), while the effluent total phosphorus concentrations were between 1 and 2 mg/L. The BNR‐S2 mode was found to require less energy per kilogram of soluble chemical oxygen demand removed than the regular and BNR‐S1 modes.