Reactive transport modelling of biogeochemical processes and carbon isotope geochemistry inside a landfill leachate plume.

B.M. van Breukelen, J. Griffioen, W.F.M. Roling, H.W. van Verseveld

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The biogeochemical processes governing leachate attenuation inside a landfill leachate plume (Banisveld, the Netherlands) were revealed and quantified using the 1D reactive transport model PHREEQC-2. Biodegradation of dissolved organic carbon (DOC) was simulated assuming first-order oxidation of two DOC fractions with different reactivity, and was coupled to reductive dissolution of iron oxide. The following secondary geochemical processes were required in the model to match observations: kinetic precipitation of calcite and siderite, cation exchange, proton buffering and degassing. Rate constants for DOC oxidation and carbonate mineral precipitation were determined, and other model parameters were optimized using the nonlinear optimization program PEST by means of matching hydrochemical observations closely (pH, DIC, DOC, Na, K, Ca, Mg, NH
Original languageEnglish
Pages (from-to)249-269
Number of pages21
JournalJournal of Contaminant Hydrology
Volume70
DOIs
Publication statusPublished - 2004

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