Download Diffusion in Natural Porous Media: Contaminant Transport, by Peter Grathwohl PDF

By Peter Grathwohl

Diffusion in normal Porous Media: Contaminant Transport,Sorption/Desorption and Dissolution Kinetics introduces the final rules of diffusion within the subsurface atmosphere and discusses the consequences for the destiny and shipping of contaminants in soils and groundwater. Emphasis is put on sorption/desorption and the dissolution kinetics of natural contaminants, either one of that are restricted via the sluggish velocity of molecular diffusion.
Diffusion in traditional Porous Media: Contaminant Transport,Sorption/Desorption and Dissolution Kinetics compiles tools for calculating the diffusion coefficients of natural compounds (in aqueous answer or vapor part) in typical porous media. the writer makes use of analytical suggestions of Fick's 2d legislation and a few easy numerical types to version diffusive delivery lower than a variety of preliminary and boundary stipulations. a few those versions can be solved utilizing spreadsheets.
The e-book examines sorption/desorption charges of natural compounds in numerous soils and aquifer fabrics, and likewise examines the dissolution kinetics of nonaqueous section beverages in aquifers, in either the trapped residual part and in swimming pools.
Diffusion in typical Porous Media: Contaminant Transport,Sorption/Desorption and Dissolution Kinetics concludes with a dialogue of the impression of gradual diffusion procedures on soil and groundwater decontamination and the results of those approaches for groundwater chance assessment.

Show description

Read or Download Diffusion in Natural Porous Media: Contaminant Transport, Sorption/Desorption and Dissolution Kinetics PDF

Best hydrology books

Groundwater Modelling in Arid and Semi-Arid Areas

Arid and semi-arid areas face significant demanding situations within the administration of scarce freshwater assets less than pressures of inhabitants, fiscal improvement, weather swap, pollutants and over-abstraction. Groundwater is usually crucial water source in those components. Groundwater versions are customary globally to appreciate groundwater platforms and to steer judgements on administration.

Innovative Subsurface Remediation. Field Testing of Physical, Chemical, and Characterization Technologies

Content material: box demonstrations of cutting edge subsurface remediation and characterization applied sciences : creation / Mark L. Brusseau, John S. Gierke, and David A. Sabatini -- Surfactant choice standards for improved subsurface remediation / David A. Sabatini, Jeffrey H. Harwell, and Robert C. Knox -- more advantageous restoration of organics utilizing direct power suggestions / T.

The Medieval Warm Period

The Medieval hot interval and the Little Ice Age are generally thought of to were the key beneficial properties of the Earth's weather over the last a thousand years. during this quantity the difficulty of even if there rather used to be a Medieval hot interval, and if this is the case, the place and whilst, is addressed. the kinds of proof tested contain old files, tree earrings, ice cores, glacial-geological documents, borehole temperature, paleoecological facts and documents of sunlight receipts inferred from cosmogenic isotopes.

Climate and Water: Transboundary Challenges in the Americas

Weather and Water: Transboundary demanding situations within the Americas explores a number of the ways in which weather, hydrology, and water source administration converge on the borders among jurisdictions and international locations within the western Hemisphere. This ebook is exclusive in concentrating on case reports of climate-hydrology-water source administration in diversified contexts in South, principal, and North the US.

Additional info for Diffusion in Natural Porous Media: Contaminant Transport, Sorption/Desorption and Dissolution Kinetics

Example text

2-33 is analogous to Archie's law which is an empirical correlation describing the electrical conductivity in porous rocks (Archie, 1942). The concentration gradient which gives rise to the diffusive flux in this case is analogous to the electrical field (Klinkenberg, 1951). g. brine saturated rocks) is: (j aq ( j rock (j rock (2-34) 32 2. Basics of Sorption and Diffusion where crrock and craq denote the electrical conductivities of the rock and the pore water, respectively. The formation factor Fj denotes a dimensionless resistance.

Komiyama and Smith (1974) reported that surface diffusion is a major contributor to the intraparticle transport of benzaldehyde in liquid-filled pores of amberlite particles (polystyrene). Seidel and Carl (1989) found that surface diffusion is concentration dependent in sorptive uptake of phenol and indole in activated carbon. g. organic films adsorbed onto the pore walls) may also be interpreted as a process analogous to surface diffusion. g. pores with organic coatings, were found to contribute significantly to the steady state diffusive fluxes of hydrocarbons (Yariv, 1976; Thomas and Clouse, 1990a).

Dykhuizen and Casey (1989) showed that in homogeneous, isotropic porous media, the tortuosity factor equals 3. In natural porous media this condition of homogeneity and isotropy is hardly achieved, and the tortuosity factor serves as a fudge factor. In most cases only the overall porosity (e) of porous media can be determined (pore size distribution and tortuosities are unknown). Therefore the relative diffusivity (D' = DelDaq) is often defined as an empirical function of e alone (8 = 1): (2-33) where m is an empirical exponent.

Download PDF sample

Rated 4.06 of 5 – based on 19 votes