ESTIMATING DISPERSION COEFFICIENT FROM SOIL-COLUMN TEST

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.

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Estimating Dispersion Coefficient and Porosity from Soil-Column Tests

Journal of Environmental Engineering ◽

10.1061/(asce)0733-9372(2002)128:11(1095) ◽

2002 ◽

Vol 128 (11) ◽

pp. 1095-1099 ◽

Cited By ~ 11

Author(s):

Sushil K. Singh

Keyword(s):

Dispersion Coefficient ◽

Soil Column ◽

Column Tests

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Adsorption of nitrate as a groundwater pollutant by soil particles

Journal of Nepal Geological Society ◽

10.3126/jngs.v34i0.31890 ◽

2006 ◽

Vol 34 ◽

pp. 141-146

Author(s):

Chieko Nakayama ◽

Yoshinori Tanaka

Keyword(s):

Nitric Acid ◽

Breakthrough Curve ◽

Amorphous Material ◽

Soil Column ◽

Soil Samples ◽

Nitrate Contamination ◽

Nitrate Content ◽

Batch Test ◽

Column Test ◽

Nitrate Adsorption

This study discusses nitrogen adsorption in several soil samples of the Kanto loam collected from two locations in the Kanto plain. Their chemical properties were assessed on each of the soil samples as well as on pure allophane clay by instrumental analysis using batch and soil column tests. Nitrogen-nitrate adsorption by soil samples was determined by a 10-hour batch test using a nitric acid solution of 0.14 mmol. A saturation column test was conducted to obtain a breakthrough curve and calculate the coefficients of dispersion and retardation. The extent of nitrate adsorption in soil samples was confirmed by percolation with 0.14 mmol nitric acid through columns packed with the soil sample and silicate sand. In the batch test, it was found that the amount of nitrate adsorption was greater in allophane-rich volcanic ash soils with the amount of nitrate adsorption increasing under conditions of low pH. The breakthrough curve determined by the column test showed that the coefficient of retardation increased in allophane-rich soils. Adsorption of nitrates by Kanto loam soils was thus found to be dependent upon the content of allophane and amorphous material in the soil. Since the positive charge of allophane has the potential to reduce the nitrate content in groundwater, it can be effectively applied to reduce nitrate contamination in groundwater.

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Analysis of Rainfall Infiltration Velocity in Unsaturated Soils Under Both Continuous and Repeated Rainfall Conditions by an Unsaturated Soil Column Test

The Journal of Engineering Geology ◽

10.9720/kseg.2011.21.2.133 ◽

2011 ◽

Vol 21 (2) ◽

pp. 133-145 ◽

Cited By ~ 5

Author(s):

Kyu-Bo Park ◽

Byung-Gon Chae ◽

Hyuck-Jin Park

Keyword(s):

Unsaturated Soil ◽

Unsaturated Soils ◽

Soil Column ◽

Rainfall Infiltration ◽

Column Test

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PREDICTED PERFORMANCE OF ESTIMATED SEEPAGE ANALYSIS MODEL BY DATA ASSIMILATION BASED ON MEASUREMENT DATA OF SOIL COLUMN TEST

Journal of Japan Society of Civil Engineers Ser C (Geosphere Engineering) ◽

10.2208/jscejge.76.4_350 ◽

2020 ◽

Vol 76 (4) ◽

pp. 350-362

Author(s):

Shinichi ITO ◽

Kazunari SAKO ◽

Ryosuke KITAMURA ◽

Yoshiteru KANEMARU ◽

Kazuo KANEMARU ◽

...

Keyword(s):

Data Assimilation ◽

Soil Column ◽

Measurement Data ◽

Column Test ◽

Analysis Model ◽

Seepage Analysis

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Nonlinear Diffusion of Solute in Soil Column — Test Method and Preliminary Result

Geosynthetics in Civil and Environmental Engineering ◽

10.1007/978-3-540-69313-0_108 ◽

2009 ◽

pp. 579-582

Author(s):

Z. Z. Li ◽

X. W. Tang ◽

Y. M. Chen ◽

Y. Wang

Keyword(s):

Nonlinear Diffusion ◽

Soil Column ◽

Test Method ◽

Column Test

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Influence of Multi-Layered Structure of Vadose Zone on Ecological Effect of Groundwater in Arid Area: A Case Study of Shiyang River Basin, Northwest China

Water ◽

10.3390/w14010059 ◽

2021 ◽

Vol 14 (1) ◽

pp. 59

Author(s):

Haohao Cui ◽

Guanghui Zhang ◽

Jinzhe Wang ◽

Qian Wang ◽

Xujuan Lang

Keyword(s):

Vadose Zone ◽

Layered Structure ◽

Groundwater Level ◽

Field Survey ◽

Soil Column ◽

Northwest China ◽

Ecological Effect ◽

Column Test ◽

Capillary Water ◽

Shiyang River Basin

The natural vegetation in arid areas of northwest China is strongly dependent on the availability of groundwater. Significantly, capillary water plays an essential role in regulating the ecological groundwater level in the multilayered structure of the vadose zone. The soil-column test and field survey in the lower reaches of the Shiyang River Basin were conducted to investigate the influence of the multi-layered structure of the vadose zone on maintaining the ecological effect of groundwater. Based on the field survey, the results show that the depth of groundwater is 3.0 m, and the rising height of capillary water is 140 cm. In the soil-column test, the height of the wetting front of the column was 125 cm. During the water releasing test, the water held by the vadose zone was 182.54 mm, which would have maintained Haloxylon’s survival in a growing season. Therefore, the multi-layered structure of the vadose zone extends the ecological groundwater depth and consequently enhances the ecological function of groundwater. Importantly, with a lower groundwater level, the clay soil layer within the rising height range of the original capillary water would hold more water and maintain a higher water content for a certain period to supply surface vegetation.

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