Role of a non-ionic surfactant and carboxylic acids on the leaching of aged DDT residues in undisturbed soil columns

2018 ◽  
Vol 19 (4) ◽  
pp. 1745-1755 ◽  
Author(s):  
Mariana Gonzalez ◽  
Francesca Maria Mitton ◽  
Karina Silvia Beatriz Miglioranza ◽  
Aránzazu Peña
Keyword(s):  
Carboxylic Acids ◽  
Ionic Surfactant ◽  
Soil Columns ◽  
Undisturbed Soil

Colloid Mobilization and Transport in Undisturbed Soil Columns. II. The Role of Colloid Dispersibility and Preferential Flow

2004 ◽  
Vol 3 (2) ◽  
pp. 424-433 ◽  
Author(s):  
C. Kjaergaard ◽  
P. Moldrup ◽  
L. W. de Jonge ◽  
O. H. Jacobsen
Keyword(s):  
Preferential Flow ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Colloid Mobilization

Colloid Mobilization and Transport in Undisturbed Soil Columns. II. The Role of Colloid Dispersibility and Preferential Flow

2004 ◽  
Vol 3 (2) ◽  
pp. 424-433 ◽  
Author(s):  
Charlotte Kjaergaard ◽  
Per Moldrup ◽  
Lis W. de Jonge ◽  
Ole H. Jacobsen
Keyword(s):  
Preferential Flow ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Colloid Mobilization

AN IMPROVED METHOD TO STUDY SOLUTE LEACHING IN LARGE UNDISTURBED SOIL COLUMNS NEAR FIELD CAPACITY TOWARD THE GROUNDWATER IN VARIOUS ENVIRONMENTS

2020 ◽  
Vol 15 (1) ◽  
pp. 93-102
Author(s):  
Cristian PĂLTINEANU ◽  
◽  
Andrei VRINCEANU ◽  
Anca-Rovena LĂCĂTUȘU ◽  
Radu LĂCĂTUŞU ◽  
...  
Keyword(s):  
Near Field ◽  
Field Capacity ◽  
Improved Method ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Solute Leaching

scholarly journals Managed aquifer recharge: study of undisturbed soil column tests on the infiltration and treatment capacity using effluent of wastewater stabilization pond

RBRH ◽  
2018 ◽  
Vol 23 (0) ◽  
Author(s):  
Jaqueline Vígolo Coutinho ◽  
Cristiano das Neves Almeida ◽  
Eduardo Bernardo da Silva ◽  
Catalin Stefan ◽  
Gilson Barbosa Athayde Júnior ◽  
...  
Keyword(s):  
Soil Column ◽  
Managed Aquifer Recharge ◽  
Future Research ◽  
Sewage Effluent ◽  
Ammoniacal Nitrogen ◽  
Aquifer Recharge ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Coastal Watershed ◽  
Stabilization Pond

ABSTRACT Managed Aquifer Recharge (MAR) is a useful tool for the treatment and use of sewage effluent because it complements conventional treatment, recovers the aquifer and minimizes risk of saltwater intrusion. This study aims to investigate technical data to determine the treatment of wastewater stabilization pond effluent using undisturbed soil columns collected from a coastal watershed study area within the BRAMAR (BRAzil Managed Aquifer Recharge) project. The treatment efficiency was monitored by measuring physico-chemical parameters (BOD 5, COD, DOC, TSS, NH3 and NO3) in two columns filled with undisturbed sandy soil in which sewage effluent was infiltrated under unsaturated condition for 72 days with an average input flow of 10 mm h-1. Results indicated reduction greater than 60% of organic matter, suspended solids and ammoniacal nitrogen. However, high concentrations of nitrate in the outflow were detected originating from nitrification of ammoniacal nitrogen. Moreover, difficulties in relation to soil clogging were observed. Furthermore, this study brought relevant contributions to understanding the influence of the infiltration rate and ability to treat effluent from wastewater stabilization ponds using undisturbed soil columns. Future research should be undertaken to improve the pretreatment methods and the operation of a MAR system in the study area.

scholarly journals Transport and accumulation of heavy metals in undisturbed soil columns

2013 ◽  
Vol 9 (3) ◽  
pp. 187-194
Keyword(s):  
Heavy Metals ◽  
Kola Peninsula ◽  
Forest Floor ◽  
High Capacity ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Podzolic Soils ◽  
Floor Layer

The podzolic soils of the Kola Peninsula, Russia, have in localised areas been highly contaminated with copper and nickel from smelting activities. Migration and retention of these metals were investigated in undisturbed soil columns irrigated with simulated background and polluted precipitation in order to study the temporal processes of retention and release within the soil. The mineral layers were strongly acidified by the contaminated precipitation. Forest floor layers demonstrated a high capacity to retain input Ni and Cu under all conditions. Mineral layers accumulated some Cu, but released Ni. In general, Ni leached through the soil faster than Cu. Since metals are strongly retained in the forest floor layer, even after reduction or cessation of inputs there may be a significant long–term risk of their leaching to deeper soil and groundwater. This risk cannot be ameliorated without remediative intervention.

Role of soil microstructure on the emission of N2O in intact small soil columns

2021 ◽  
Author(s):  
Patricia Ortega-Ramirez ◽  
Valérie Pot ◽  
Patricia Laville ◽  
Steffen Schlüter ◽  
Dalila Hadjar ◽  
...  
Keyword(s):  
Geodesic Distance ◽  
Soil Column ◽  
Volume Effect ◽  
Radial Dependence ◽  
Soil Columns ◽  
Soil Matrix ◽  
Large Variability ◽  
Soil Microstructure ◽  
Matrix Potential

<p>N<sub>2</sub>O emission in soils is a consequence of the activity of nitrifying and denitrifying microorganisms and potentially abiotic processes. However, the <span>large</span> microscale variability of the soil characteristics that influence these processes and in particular the location of anoxic microsites, limits prediction efforts. Better understanding of denitrification activity on microscopic scales is required to improve predictions of N<sub>2</sub>O emissions.</p><p>This study explored the role of soil microstructure on N<sub>2</sub>O emission. To fulfill this objective we sampled 24 soil columns (5 cm diameter, 6 cm height) in the surface layer of a same plot in a cultivated soil (Luvisol, La Cage, Versailles, France). The soil samples were saturated with a solution of ammonium nitrate (NH<sub>4</sub>NO<sub>3</sub>), and equilibrated at a matrix potential of -32 cm (pF 1.5). The emitted fluxes of N<sub>2</sub>O were measured during 7 days. At the end of the experiment, the soil columns were scanned in a X-ray micro tomograph, at the University of Poitiers. A 32 µm voxel resolution was achieved for the 3D reconstructed images.</p><p>In order to reduce noise and segment the 3D images, the same protocol was implemented for all columns. The reduction of noise consisted of passing a non-local mean filter, a non-sharp mask and a radial correction. Such combination of steps succeeded in removing both ring artifacts and the radial dependence of the voxel values. Due to the variety of material densities in the soil, a local segmentation based on the watershed method was implemented to classify the soil <span>constituents</span> in four <span>classes (based on its density value)</span>: air, water and organic matter (OM), soil matrix and minerals. This method is good for detecting thin pores and avoids missclassification of voxels undergoing partial volume effect, which can lead to false organic coatings around macropores.</p><p>The soil columns exhibited a large variability of accumulated N<sub>2</sub>O after 7 days (from 107 to 1940 <span>µgN kg</span><sup><span>-1</span></sup><span> d.w. soil</span>). The size of OM clusters varied between a couple and up to t<span>housands</span> of voxels. No correlation was found between the emission of N<sub>2</sub>O and the porosity, nor between the N<sub>2</sub>O emission and the connectivity of the air phase. Based on the <span>premise</span> that the less accessible is the oxygen to the OM, the bigger should be the N<sub>2</sub>O emission of the soil column, we proposed and computed a microscopic spatial descriptor, I<sub>gd</sub>, based on the notion of the geodesic distance between <span>clusters</span> of OM and air for each soil column 3D image. We expect to find a correlation between I<sub>gd</sub> and the <span>N</span><sub><span>2</span></sub><span>O emission.</span></p>

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