High ammonium loading and nitrification modelling in a fixed-bed bioreactor. (December 2017)

• Record Type: Journal Article
• Authors: Cruvellier, Nelly; Poughon, Laurent; Creuly, Catherine; Dussap, C-Gilles; Lasseur, Christophe
• Is Part Of: Journal of water process engineering. Volume 20(2018)
• Page Start: 90
• Page End: 96
• Publication Date: 2017-12
• Subjects: Nitrification -- Fixed-bed reactor -- Modelling -- Continuous culture; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2017.10.006
• Languages: English
• ISSNs: 2214-7144

Abstract

Graphical abstract: Highlights: Pure cultures of nitrifying bacteria cultivated on polystyrene beads. High ammonium load removal: 2.5 kgN/m 3 d. Precise model developed for controlling of nitrification process. Removal of nitrogen daily production by one human. Abstract: The aim of this study was to investigate ammonia load removable by a fixed-bed bioreactor. In this study, high ammonia loads, up to 4.5 kgN/m 3 d were applied on a fixed bed reactor colonised by two pures nitrifying bacteria: Nitrosomonas europaea ATCC ® 19718 and Nitrobacter winogradskyi ATCC ® 25391. The loads were similar to the highest values reported in literature especially with a two bacteria population. The complete ammonia removal efficiency in our installation has reached 2.5 kgN/m 3 .d for a full nitrification. An N-tank in series model was used to represent the fixed bed reactor and to predict the nitrification in the installation. The developed model was accurate and representative of the nitrification assumed by Nitrosomonas europaea ATCC ® 19718 and Nitrobacter winogradskyi ATCC ® 25391. This model was also used to predict the biomass and oxygen concentrations during the experiment under various operational conditions. The biofilm fixed on the solid support (polysterene beads 2 mm diameter) was mainly present in the bottom of the reactor where the ammonia load was applied. It is demonstrated that in this region of the column the oxygen concentrations reached the lowest values.