title: High-rate nitrogen removal from livestock manure digester liquor by combined partial nitritation-anammox process.
abstract: In this study, combination of a partial nitritation reactor, using immobilized polyethylene glycol (PEG) gel carriers, and a continuous stirred granular anammox reactor was investigated for nitrogen removal from livestock manure digester liquor. Successful nitrite accumulation in the partial nitritation reactor was observed as the nitrite production rate reached 2.1 kg-N/m(3)/day under aerobic nitrogen loading rate of 3.8 kg-N/m(3)/day. Simultaneously, relatively high free ammonia concentrations (average 50 mg-NH(3)/l) depressed the activity of nitrite oxidizing bacteria with nitrate concentration never exceeding 3% of TN concentration in the effluent of the partial nitritation reactor (maximum 35.2 mg/l). High nitrogen removal rates were achieved in the granular anammox reactor with the highest removal rate being 3.12 kg-N/m(3)/day under anaerobic nitrogen loading rate of 4.1 kg-N/m(3)/day. Recalcitrant organic compounds in the digester liquor did not impair anammox reaction and the SS accumulation in the granular anammox reactor was minimal. The results of this study demonstrated that partial nitritation-anammox combination has the potential to successfully remove nitrogen from livestock manure digester liquor.
authors: Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan. qs_cyj@yahoo.com.cn
authors: Sen
authors: S
authors: Qiao
authors: Taichi
authors: T
authors: Yamamoto
authors: Motoki
authors: M
authors: Misaka
authors: Kazuichi
authors: K
authors: Isaka
authors: Tatsuo
authors: T
authors: Sumino
authors: Zafar
authors: Z
authors: Bhatti
authors: Kenji
authors: K
authors: Furukawa
mesh_terms: D000641:Ammonia / Q000378:metabolism*; D000693:Anaerobiosis; D000818:Animals; D000829:Animals, Domestic / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D008372:Manure / Q000032:analysis / Q000382:microbiology*; D009566:Nitrates / Q000378:metabolism; D009573:Nitrites / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D008372:Manure; D009566:Nitrates; D009573:Nitrites; D000641:Ammonia; D009584:Nitrogen