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

doi:10.2166/wst.1993.0612

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

Civil Environ Construct Engineering

Research output: Contribution to journal › Article › peer-review

20 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 language	English
Pages (from-to)	139-147
Number of pages	9
Journal	Water Science and Technology
Volume	28
Issue number	8-9
DOIs	https://doi.org/10.2166/wst.1993.0612
State	Published - 1993

Keywords

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

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10.2166/wst.1993.0612

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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.",

keywords = "Colloid, Contaminated sediment, Diffusive exchange, Dissolved organic carbon, Facilitated transport, Mathematical model",

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year = "1993",

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T1 - Transport of dissolved organic carbon-derived natural colloids from bed sediments to overlying water

T2 - Laboratory simulations

AU - Valsaraj, K. T.

AU - Thoma, G. J.

AU - Porter, C. L.

AU - Reible, D. D.

AU - Thibodeaux, L. J.

PY - 1993

Y1 - 1993

N2 - 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.

AB - 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.

KW - Colloid

KW - Contaminated sediment

KW - Diffusive exchange

KW - Dissolved organic carbon

KW - Facilitated transport

KW - Mathematical model

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DO - 10.2166/wst.1993.0612

M3 - Article

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VL - 28

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EP - 147

JO - Water Science and Technology

JF - Water Science and Technology

IS - 8-9

ER -

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

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Keywords

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