Effect of pH and nitrite concentration on nitrite oxidation rate

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RESEARCH PRODUCT

Effect of pH and nitrite concentration on nitrite oxidation rate

E. Jiménez Juan Bautista Giménez María Victoria Ruano J. Serralta José Ferrer

subject

Waste component removal PH range Unclassified drug Respirometric technique Laboratory method PH Oxidation rates PH value Nitrite Saturation constant Batch reactor PH effect Oxidation kinetics Dissociation constant Nitrobacter Kinetic expression Waste Disposal Fluid Inhibition constants chemistry.chemical_compound Bacterium Bioreactors Nitrous acid Nitrite Bacterial activity Reaction kinetics Bacteria (microorganisms)Waste Management and Disposal In Situ Hybridization Fluorescence Inhibition Priority journal Free nitrous acid Microscopy Nitrous acid Sewage biology Fluorescence in situ hybridization PH effects General Medicine Saturation Respirometry Hydrogen-Ion Concentration Inorganic acids Nitrite oxidizing bacteria Calibration Oxidation-Reduction Environmental Engineering Inorganic chemistry Bioreactor Parameterization Bioengineering Activated sludge reactors Article Numerical model Nitrous acid derivative Reaction rate Parameter calibration Batch experiments Nitrite-oxidizing bacteria Oxidation Dietary Nitrate Nitrites TECNOLOGIA DEL MEDIO AMBIENTE Experimental study Bacteria Concentration (process)Renewable Energy Sustainability and the Environment Bacteriology Nitrobacter Oxidation reduction Nitrogen removal Concentration (composition)biology.organism_classification Inorganic acids Microbial activity Kinetics chemistry Activated sludge Nitrite oxidation High pH value Switch function Concentration (parameters)Oxidation process Effect of pH Protein expression Substrate Controlled study Waste disposal

description

The effect of pH and nitrite concentration on the activity of the nitrite oxidizing bacteria (NOB) in an activated sludge reactor has been determined by means of laboratory batch experiments based on respirometric techniques. The bacterial activity was measured at different pH and at different total nitrite concentrations (TNO 2). The experimental results showed that the nitrite oxidation rate (NOR) depends on the TNO 2 concentration independently of the free nitrous acid (FNA) concentration, so FNA cannot be considered as the real substrate for NOB. NOB were strongly affected by low pH values (no activity was detected at pH 6.5) but no inhibition was observed at high pH values (activity was nearly the same for the pH range 7.5-9.95). A kinetic expression for nitrite oxidation process including switch functions to model the effect of TNO 2 concentration and pH inhibition is proposed. Substrate half saturation constant and pH inhibition constants have been obtained. © 2011 Elsevier Ltd.

year	journal	country	edition	language
2011-05-16	Bioresource Technology

https://doi.org/10.1016/j.biortech.2011.07.092