title: Characteristics of nitrite and nitrate in situ denitrification in landfill bioreactors.
abstract: The objective of this research was to investigate the macroscopical effect of high concentration nitrite and nitrate denitrification on waste decomposition and to evaluate the kinetics of NO(3)(-)-N and NO(2)(-)-N removal. Two reactors loaded fresh refuse were fed 4000 mg NO(3)(-)-N/L or 4000 NO(2)(-)-N/L every 48 h, respectively. Results showed that NO(3)(-)-N addition was more effective on promotion of the waste degradation process as compared to NO(2)(-)-N addition. In the initial stage, NO(x)(-)-N removal was mainly contributed by adsorption rather than denitrification. NO(x)(-)-N reduction rate data obtained from microcosm experiment were fit to Monod kinetics, with specific removal rates of 1.625 mg NO(3)(-)-N/(g dry waste d) and 1.125 mg NO(2)(-)-N/(g dry waste d) and nitrogen removal half-saturation constants of 1250.5 NO(3)(-)-N/L and 125.5 NO(2)(-)-N/L, respectively.
authors.affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering, MOE, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, PR China.
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Fu
authors.forename: Fenglin
authors.initials: F
authors.lastname: Yang
authors.forename: Yingyu
authors.initials: Y
authors.lastname: An
authors.forename: Yuan
authors.initials: Y
authors.lastname: Xue
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D003198:Computer Simulation; D008954:Models, Biological; D009566:Nitrates / Q000737:chemistry / Q000378:metabolism*; D009573:Nitrites / Q000737:chemistry / Q000378:metabolism*; D012037:Refuse Disposal / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism*
chemical_list: D009566:Nitrates; D009573:Nitrites; D014874:Water Pollutants, Chemical