title: Effect of increase in salinity on ANAMMOX-UASB reactor stability.
abstract: The effect of salinity on the anaerobic ammonium oxidation (ANAMMOX) process in a UASB reactor was investigated by analysing ammonium, nitrite, nitrate and TN concentrations, and TN removal efficiency. Extracellular polymeric substances (EPSs) and specific ANAMMOX activity (SAA) were evaluated. Results showed the effluent deteriorated after salinity was increased from 8 to 13 g/L and from 13 to 18 g/L, and TN removal efficiency decreased from 80% to 30% and 80% to 50%, respectively. However, ANAMMOX performance recovered and TN removal efficiency increased to 80% after 40 days when the influent concentrations of [Formula: see text] and [Formula: see text] were 200 mg/L and salinity levels were at 13 and 18 g/L, respectively. The amount of EPSs decreased from 58.9 to 37.1 mg/g volatile suspended solids (VSS) when the reactor was shocked by salinity of 13 g/L, and then increased to 57.2 mg/g VSS when the reactor recovered and ran stably at 13 g/L. The amount of EPSs decreased from 57.2 to 49.1 mg/g VSS when the reactor was shocked by salinity of 18 g/L, and then increased to 60.7 mg/g VSS when the reactor recovered and ran stably at 18 g/L. The amount of EPS and the amounts of polysaccharide, protein and humus showed no evident difference when the reactor recovered from different levels of salinity shocks. Batch tests showed salinity shock load from 8 to 38 g/L inhibited the SAA. However, when the reactor recovered from salinity shocks, SAA was higher compared to that when the reactor was subjected to the same level of salinity shock.
authors: a Faculty of Urban Construction and Environmental Engineering , Chongqing University , Chongqing , People's Republic of China.
authors: Hui
authors: H
authors: Xing
authors: a Faculty of Urban Construction and Environmental Engineering , Chongqing University , Chongqing , People's Republic of China.
authors: Han
authors: H
authors: Wang
authors: a Faculty of Urban Construction and Environmental Engineering , Chongqing University , Chongqing , People's Republic of China.
authors: Fang
authors: F
authors: Fang
authors: a Faculty of Urban Construction and Environmental Engineering , Chongqing University , Chongqing , People's Republic of China.
authors: Kai
authors: K
authors: Li
authors: a Faculty of Urban Construction and Environmental Engineering , Chongqing University , Chongqing , People's Republic of China.
authors: Lianwei
authors: L
authors: Liu
authors: b Key Laboratory of Reservoir Aquatic Environment of CAS , Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing , People's Republic of China.
authors: Youpeng
authors: Y
authors: Chen
authors: b Key Laboratory of Reservoir Aquatic Environment of CAS , Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences , Chongqing , People's Republic of China.
authors: Jinsong
authors: J
authors: Guo
mesh_terms: D064751:Ammonium Compounds / Q000378:metabolism*; D000693:Anaerobiosis; D019149:Bioreactors; D009566:Nitrates / Q000378:metabolism; D009573:Nitrites / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism*; D010084:Oxidation-Reduction; D054712:Salinity; D012722:Sewage / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D064751:Ammonium Compounds; D009566:Nitrates; D009573:Nitrites; D012722:Sewage; D014874:Water Pollutants, Chemical; D009584:Nitrogen
keywords: ANAMMOX; EPS; SAA; UASB; salinity