title: Simple models for the release kinetics of dissolved organic carbon from woody filtration media.
abstract: The mechanisms and kinetics of dissolved organic carbon (DOC) release from woody materials (pine, hardwood and compost) under non-equilibrium leaching conditions was examined through batch and column tests. Mechanistically based kinetic models (first and second order) had a low predictive power for DOC release compared to those based solely on regression (Elovitch, power law). The DOC release data showed a bi-phasic response, with an early period of rapid release (<24h) controlled by film diffusion followed by a slower rate controlled by intra-particle diffusion. After flow interruption, DOC release was primarily controlled by intra-particle diffusion; however, the specific rate parameters generally varied with each flow cycle and between different wood types.
authors.affiliation: Faculty of Engineering, University of Technology, P.O. Box 123, NSW 2007, Sydney, Australia. robert.mclaughlan@uts.edu.au
authors.forename: Robert G
authors.initials: RG
authors.lastname: McLaughlan
authors.forename: Othman
authors.initials: O
authors.lastname: Al-Mashaqbeh
mesh_terms: D000042:Absorption; D002244:Carbon / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D005374:Filtration; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008954:Models, Biological; D028223:Pinus / Q000737:chemistry; D014872:Water Movements; D018508:Water Purification; D014934:Wood / Q000737:chemistry*
chemical_list: D002244:Carbon