Kinetics of nitrogen removal in high rate anammox upflow filter.
The process kinetics for laboratory-scale anammox (anaerobic ammonium oxidation) upflow filter using synthetic wastewater as feed were investigated. The experimental unit consisted of a 2.0 L reactor filled with three-dimensional plastic media. The filter was tested for different influent substrate concentrations and hydraulic retention time (HRT). The substrate loading removal rate was compared with prediction of Stover-Kincannon, second-order and the first-order substrate removal models. Upon approaching pseudo-steady-state condition, substrate ammonium or nitrite concentrations were increased from 280 to 462 mg N/L, while HRT was stepwise decreased from 14.4 to 2h, with a concomitant increase in nitrogen loading rate (NLR) from 0.93 to 7.34 g/L day. Based on calculations, Stover-Kincannon model and second-order "Grau" model were found to be the appropriate models to describe the upflow filter. According to Stover-Kincannon model, the maximum total substrate removal rate constant (U(max)) and saturation value constant (K(B)) were suggested as 12.4 and 12.0 g N/L day, respectively. As Stover-Kincannon model and second-order model gave high correlation coefficients (97.9% and 98.6%, respectively), these models may be used in predicting the behavior or design of the anammox filter.
Jin
Ren-Cun
RC
Department of Environmental Science, Hangzhou Normal University, Hangzhou 310036, China. jrczju@yahoo.com.cn
Zheng
Ping
P
D000465:Algorithms; D000693:Anaerobiosis; D019149:Bioreactors; D005374:Filtration; D007700:Kinetics; D008954:Models, Biological; D009584:Nitrogen / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012722:Sewage; D014865:Waste Disposal, Fluid; D014867:Water; D014874:Water Pollutants, Chemical / Q000032:analysis*
D000644:Quaternary Ammonium Compounds; D012722:Sewage; D014874:Water Pollutants, Chemical; D014867:Water; D009584:Nitrogen