Application of the BioClog model for landfill leachate clogging of gravel-packed columns

A numerical, multiple-species, reactive chemical transport model (BioClog) developed to predict clogging in landfill leachate collection systems is used to interpret results from experiments conducted with gravel-packed columns permeated with landfill leachate. The model predicts changes to the microbial community and leachate chemistry, in- cluding the concentrations of volatile fatty acids, suspended biomass, dissolved calcium, and suspended inorganic sol- ids. The calculated quantity and composition of the clog matter (biomass and mineral), along with the associated decrease in porosity, are compared to the measured values. The modelled clogging is in reasonable agreement with that observed in the gravel column experiments. By identifying and quantitatively linking many microbiological, chemical, and transport mechanisms, the model helps elucidate the phenomena controlling the rate and extent of clogging. Resume : Pour interpreter les resultats d'experiences conduites avec des colonnes remplies de gravier et infiltrees par un lixiviat de depot sanitaire, on utilise un modele numerique de transport chimique reactif a especes multiples (BioClog) afin de predire le colmatage dans les systemes de collecte des lixiviats des depots sanitaires. Le modele predit les changements dans la population microbienne et dans la chimie du lixiviat, incluant les concentrations des acides gras- ses volatiles, de la biomasse en suspension, du calcium dissout, et des solides inorganiques en suspension. La quantite calculee et la composition des materiaux de colmatage (biomasse et mineraux) de meme que la diminution associee de la porosite sont comparees aux valeurs mesurees. Le colmatage modelise est en concordance raisonnable avec celui ob- serve dans les experiences sur des colonnes de gravier. En identifiant et reliant quantitativement plusieurs mecanismes de transport chimique et microbiologique, le modele aide a elucider les phenomenes controlant la vitesse et l'etendue du colmatage. Mots cles : colmatage, depot sanitaire, systeme de collecte de lixiviat, biofilms, precipitation minerale. (Traduit par la Redaction) Cooke et al. 1614

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