Estimating Dispersion Coefficient and Porosity from Soil-Column Tests

2002 ◽  
Vol 128 (11) ◽  
pp. 1095-1099 ◽  
Author(s):  
Sushil K. Singh
Keyword(s):  
Dispersion Coefficient ◽  
Soil Column ◽  
Column Tests

scholarly journals Determination of transport parameters for heavy metal in residual compacted soil using two methodologies

2006 ◽  
Vol 33 (7) ◽  
pp. 912-917
Author(s):  
Izabel Christina Duarte Azevedo ◽  
Cleidimar Rejane Nascentes ◽  
Antonio Teixeira de Matos ◽  
Roberto Francisco de Azevedo
Keyword(s):  
Heavy Metals ◽  
Dispersion Coefficient ◽  
Soil Column ◽  
Optimization Procedure ◽  
Retardation Factor ◽  
Hydrodynamic Dispersion ◽  
Column Test ◽  
Transport Parameters ◽  
Compacted Soil ◽  
Cumulative Mass

Values of the hydrodynamic dispersion coefficient and retardation factor obtained using the traditional and cumulative mass methods of column test analysis for zinc, manganese, and cadmium in a compacted soil are compared. The soil under study is from the B horizon of a residual gneissic tropical soil used for construction of the liner for the sanitary landfill in the District of Visconde do Rio Branco, Minas Gerais (MG), Brazil. To evaluate the behavior of landfill leachate heavy metals through the soil, soil column tests were performed on samples of compacted soil. A computational program that uses an optimization procedure to generate values of the hydrodynamic dispersion coefficient and retardation factor was developed to facilitate interpretation of the results obtained by the cumulative mass method. Values of the retardation factor and hydrodynamic dispersion coefficient were not influenced by the method of determination, even when a reduced number of effluent samples was used by the cumulative mass method. The use of the cumulative mass method, based on a reduced number of pore volumes, reduces the time and cost involved in the tests.Key words: heavy metals, column test, cumulative mass method.

scholarly journals Application of a Biostimulation Model to Trichloroethylene Transformation in Soil Column Tests

2004 ◽  
Vol 27 (12) ◽  
pp. 803-809
Author(s):  
Masayoshi KITAGAWA ◽  
Masahiro EGUCHI ◽  
Katsutoshi SHIBUYA ◽  
Satoshi SODA ◽  
Masanori FUJITA
Keyword(s):  
Soil Column ◽  
Column Tests

Relationship between the formation of flow paths and elution behavior with water flow through the soil column

2021 ◽  
Author(s):  
Kyouhei Tsuchida ◽  
Kengo Nakamura ◽  
Monami Kondo ◽  
Noriaki Watanabe ◽  
Takeshi Komai
Keyword(s):  
Aqueous Solution ◽  
Transport Phenomenon ◽  
Soil Column ◽  
Flow Path ◽  
Column Tests ◽  
Flow Paths ◽  
X Ray ◽  
Elution Behavior ◽  
Flow Through ◽  
The Relationship

<p>The transport phenomenon of pollutants in soil is complicated because of the formation of the flow path in soil. In this study, the relationship between the flow path in the soil and the elution behavior of various components was evaluated by the column tests with different filling methods to change the flow path in the column. The flow path in the column was visualized by using potassium iodide aqueous solution and X-ray CT. Our result shows that the elution behavior of the easily eluted components was not significantly affected by the flow path in the column. In addition, the cation more eluted when the flow path spread throughout the column than when the flow path was intensive. This suggests that eluted components may be affected by anions in soil. From these results, it was found that the elution behavior of components is influenced by the flow path in the column and some were not, and when it was influenced, the degree of influence is different depending on the components.</p>

Evaluation of moisture reduction in aggregate base by wicking geotextile using soil column tests

2019 ◽  
Vol 47 (3) ◽  
pp. 306-314
Author(s):  
Jun Guo ◽  
Jie Han ◽  
Xiong Zhang ◽  
Zexia Li
Keyword(s):  
Soil Column ◽  
Column Tests ◽  
Aggregate Base

Adsorption experiment of toxic micro-pollutants derived from automobiles using red soil

2015 ◽  
Vol 72 (11) ◽  
pp. 2082-2088
Author(s):  
Takahiro Kawai ◽  
Atsushi Ichiki ◽  
Yasunori Sawada
Keyword(s):  
Molecular Weight ◽  
Soil Column ◽  
Red Soil ◽  
Economic Activities ◽  
Point Source Pollution ◽  
Column Tests ◽  
Runoff Water ◽  
Batch Type ◽  
Polycyclic Aromatic ◽  
Micro Pollutants

In some countries, non-point source pollution derived from a city's economic activities tends to be a barrier to the improvement of water quality. Roadway runoff is known to contain toxic micro-pollutants such as polycyclic aromatic hydrocarbons (PAHs). Conversely, red soil is known to adsorb some organic matter. In this study, artificial roadway runoff water containing toxic micro-pollutants was made using roadway dust collected from a highway, and used for both batch-type tests and soil column tests with red soil in order to understand adsorption ability of the red soil on such toxic micro-pollutants, especially PAHs. In the batch-type tests, PAHs could be removed by approximately 40% when the contact time was 90 minutes. In the soil column tests, PAHs were removed by more than 80% while suspended solids were removed by more than 90%. Notably, PAHs with a high molecular weight were removed more readily in the tests than PAHs with a low molecular weight.

scholarly journals Modeling Contaminant Transport of Nitrate in Soil Column

2021 ◽  
Vol 5 (4) ◽  
pp. 471-485
Author(s):  
Anthony Chibuzo Ekeleme ◽  
Benjamin Nnamdi Ekwueme ◽  
Jonah Chukwuemeka Agunwamba
Keyword(s):  
Contaminant Transport ◽  
Dispersion Coefficient ◽  
Soil Column ◽  
Soil Columns ◽  
Modified Model ◽  
Agno3 Solution ◽  
The Difference ◽  
Experimental Values ◽  
Column Outlet ◽  
Chemical Contents

Soil forms solution when it is in contact with water or any liquid. This soil solution disperses into the ground in different parts, at different velocities. Hence, the chemical contents of the soil are leached gradually from soil with infiltrating water. Soil parameter characterizing this phenomenon is referred to as Solute dispersivity. The objective of this study is to model contaminant transport of nitrate in soil, calibrate and verify the model derived. Dispersion studies were performed in the laboratory using soil columns filled with silver nitrate (AgNO3) solution. Samples were collected from the column outlet at intervals of 5minutes and the dispersion coefficient calculated. The dispersion coefficient calculated was incorporated into existing Notordamojo’s model and solved. Results obtained from the research showed that the R2values ranging from 0.741 to 0.896 and 0.484 to 0.769 were obtained for the modified model and the existing Notordamojo’s model respectively. The model verified with the experimental data showed predicted transport was in close agreement with experimental values having coefficient of correlation (r) ranging from 0.86 to 0.98. The difference between the experimental and predicted results, when expressed as a percentage of the experimental value was less than 5%. The study has established that the modified model which accounted for variability in dispersion coefficient offered a better approach than the conventional one. Doi: 10.28991/esj-2021-01290 Full Text: PDF

Using the Fractional Advection Dispersion Equation to Improve the Scale Effect in the Sampling Process of Column Tests with Lateritic Soils

2015 ◽  
Vol 365 ◽  
pp. 188-193 ◽  
Author(s):  
Ricardo Mendonça de Moraes ◽  
André Luís Brasil Cavalcante
Keyword(s):  
Dispersion Equation ◽  
Contaminant Transport ◽  
Dispersion Coefficient ◽  
Breakthrough Curves ◽  
Column Tests ◽  
Lateritic Soils ◽  
Advection Dispersion ◽  
Sampling Process ◽  
Heterogeneous Soil ◽  
Heavy Tailed

Breakthrough curves (BTCs) obtained from column tests in heterogeneous soils are not satisfactorily simulated with the advection-dispersion equation (ADE) for some heavy tailed cases. Furthermore, the dispersion coefficient calculated with the ADE for heavy tailed BTCs are scale dependent when simulating columns of soil larger than the original test depth. In this paper we compare the usage of a fractional ADE (FADE) and the classical ADE to fit column tests BTCs made with Brazilian lateritic soils, discussing both contaminant transport theories and underlying stochastic models. The FADE can more accurately simulate heavy tailed BTCs, and when applying the adjusted FADE parameters to longer depths of soil, the FADE also predicts a more realistic scenario of contaminant transport through heterogeneous soil. The addition of fractional calculus in the advection-dispersion equation proves to improve contaminant transport predictions based on column tests over the classical ADE, with the use of a constant fractional dispersion coefficient that is scale independent.

scholarly journals Leach and soil column tests with stored redox sludge

1970 ◽  
Author(s):  
W.W. Schulz ◽  
G.L. Ritter
Keyword(s):  
Soil Column ◽  
Column Tests
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