title: Ammonium removal by partial nitritation and Anammox processes from wastewater with increased salinity.
abstract: This work is dedicated to the biological treatment of wastewater with increased salinity using a combination of partial nitritation and Anammox processes. Two one-stage deammonification moving bed biofilm reactors were operated with the increase in NaCl concentration every two weeks by 5 and 2.5 g/L. The strategy with a step of 5 g/L of salinity increase led to complete inhibition of the process at the salinity level of 15 g/L. The strategy with a step of 2.5 g/L gave possibility to adapt bacteria to the elevated salinity. After reaching the salinity level of 10 g NaCl/L, the reactor was operated during 92 days with a nitrogen removal rate of 0.39±0.19 g N/(m2·day) (0.078±0.038 kg N/m3·day) and an average nitrogen removal efficiency of 59%. It was shown that conductivity cannot be used for monitoring the process when a reactor is treating wastewater with increased salinity, whereas pH can be correlated to effluent ammonium concentration regardless of wastewater salinity.
authors.affiliation: a Department of Sustainable Development, Environmental Science and Engineering , Royal Institute of Technology (KTH) , Teknikringen 76, 100-44 , Stockholm , Sweden.
authors.forename: Andriy
authors.initials: A
authors.lastname: Malovanyy
authors.forename: Elzbieta
authors.initials: E
authors.lastname: Plaza
authors.forename: Jozef
authors.initials: J
authors.lastname: Trela
authors.forename: Myroslav
authors.initials: M
authors.lastname: Malovanyy
mesh_terms: D000220:Adaptation, Biological; D064751:Ammonium Compounds / Q000302:isolation & purification* / Q000378:metabolism; D019149:Bioreactors; D054712:Salinity; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
chemical_list: D064751:Ammonium Compounds; D062065:Wastewater
keywords: Anammox; activity; ammonium; nitrification; wastewater