Transport of dissolved organic carbon-derived natural colloids from bed sediments to overlying water: Laboratory simulations

K. T. Valsaraj, G. J. Thoma, C. L. Porter, D. D. Reible, L. J. Thibodeaux

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Natural colloids are part of the carbon cycle arising from sediment diagenesis. Natural colloids can be quantified as the dissolved organic carbon (DOC) present in the pore-water of sediment beds. In this paper we demonstrate that DOC is mobile in a system in which the dominant transport mechanism is Brownian diffusion. A simple model which assumes constant physico-chemical properties for the DOC adequately predicts the DOC release rate from a sediment bed in a microcosm. A single adjustable parameter, the water diffusivity, is used to fit the model to the experimental data. The experimental diffusivities obtained from the fitted data agree well with previously presented values.

Original languageEnglish
Pages (from-to)139-147
Number of pages9
JournalWater Science and Technology
Volume28
Issue number8-9
DOIs
StatePublished - 1993

Keywords

  • Colloid
  • Contaminated sediment
  • Diffusive exchange
  • Dissolved organic carbon
  • Facilitated transport
  • Mathematical model

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