NDLI: Kinetic modeling of the electrochemical removal of ammonium and COD from landfill leachates

Content Provider	Springer Nature Link
Author	Urtiaga, Ane Ortiz, Inmaculada Anglada, Angela Mantzavis, Dionissios Diamadopoulos, Evan
Copyright Year	2012
Abstract	Leachates generated from municipal landfills are complex effluents that contain high concentrations of organic pollutants, ammonium, chloride and many other soluble compounds. The aim of this study is to develop a generalized mathematical model for the description of the kinetics of the electro-oxidation of COD and NH$_{4}$ $^{+}$ contained in landfill leachates at boron doped diamond anodes. This complex scenario has been structured by defining two regimes for COD oxidation kinetics: (i) for j $_{lim,COD}$ < j $_{appl}$ ≤ (j $_{lim,COD}$ + $$ j_{{{ \lim },{\text{NH}}_{4}^{ + } }} $$ ) only direct and $^{•}$OH mediated oxidation reactions close to the anode surface occur, and the process is mass transfer controlled and described by the mass transfer coefficient k $_{m}$, a parameter affected by the hydrodynamics of the cell; ii) for j $_{appl}$ > (j $_{lim,COD}$ + $$ j_{{{ \lim },{\text{NH}}_{4}^{ + } }} $$ ) indirect oxidation in the bulk takes place which is quantified by an adjustable parameter k, for which a correlation with the applied current and the chloride concentration has been obtained. Ammonium oxidation occurred by electrogenerated chlorine, for which a second adjustable parameter k′ has been defined. k′ has been correlated to the initial COD concentration and the applied current, expressed as (A/V) · (j $_{appl}$/j $_{lim,COD}$). The robustness of this model was corroborated by its good description of the experimental results obtained with leachates from two landfill sites located at Chania (Greece) and Meruelo (Spain), and with variable degrees of pretreatment, therefore with a wide range of compositions, and for different operating conditions. The model developed from laboratory scale data was validated at pilot scale with a total BDD anodic area of 1.05 m$^{2}$.
Starting Page	779
Ending Page	786
Page Count	8
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	42
Issue Number	9
e-ISSN	15728838
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-08-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Landfill leachates BDD anodes Ammonium oxidation COD oxidation Mathematical modeling of electro-oxidation Physical Chemistry Industrial Chemistry/Chemical Engineering Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Electrochemistry

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