title: Low temperature biological phosphorus removal and partial nitrification in a pilot sequencing batch reactor system.
abstract: Partial nitrification and biological phosphorus removal appear to hold promise of a cost-effective and sustainable biological nutrient removal process. Pilot sequencing batch reactors (SBRs) were operated under anaerobic/aerobic configuration for 8 months. It was found that biological phosphorus removal can be achieved in an SBR system, along with the partial nitrification process. Sufficient volatile fatty acids supply was the key for enhanced biological phosphorus removal. This experiment demonstrated that partial nitrification can be achieved even at low temperature with high dissolved oxygen (>3 mg/L) concentration. Shorter solid retention time (SRT) for nitrite oxidizing bacteria (NOB) than for ammonia oxidizing bacteria due to the nitrite substrate limitation at the beginning of the aeration cycle was the reason that caused NOB wash-out. Controlling SRT should be the strategy for an SBR operated in cold climate to achieve partial nitrification. It was also found that the aerobic phosphorus accumulating organisms' P-uptake was more sensitive to nitrite inhibition than the process of anaerobic P-release.
authors: Dept. of Civil Engineering, University of Manitoba, Canada R3T 5V6. umyuan3@cc.umanitoba.ca
authors: Qiuyan
authors: Q
authors: Yuan
authors: Jan A
authors: JA
authors: Oleszkiewicz
mesh_terms: D000641:Ammonia / Q000737:chemistry; D001420:Bacteria, Aerobic / Q000254:growth & development; D001421:Bacteria, Anaerobic / Q000254:growth & development; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000737:chemistry; D058465:Nitrification; D009573:Nitrites / Q000737:chemistry; D010758:Phosphorus / Q000302:isolation & purification*; D010865:Pilot Projects; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D005232:Fatty Acids, Volatile; D009573:Nitrites; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D000641:Ammonia