Assessment of the retardation of selected herbicides onto Danube sediment based on small column tests

2018 ◽  
Vol 19 (2) ◽  
pp. 964-972 ◽  
Author(s):  
Anita Leovac Maćerak ◽  
Ivana Ivančev-Tumbas ◽  
Hilmar Börnick ◽  
Gordana Ilić ◽  
Marijana Kragulj Isakovski ◽  
...  
Keyword(s):  
Column Tests ◽  
Small Column

scholarly journals Capability of Uranium Heap Leaching From Gattar and El Missikat Area, Eastern Desert, Egypt: A Kinetic Approach

2020 ◽  
pp. 1-7
Author(s):  
Mohamed Nagar S ◽  
◽  
F A El-Sayed ◽  
W M Morsy ◽  
◽  
...  
Keyword(s):  
Chemical Reaction ◽  
Large Scale ◽  
Eastern Desert ◽  
Heap Leaching ◽  
Diffusion Reaction ◽  
Column Tests ◽  
Small Column ◽  
Optimum Parameters ◽  
Reaction Models ◽  
Leaching Efficiency

Detailed studies of uranium heap leaching from different uranium mineralization resources situated in Eastern Desert of Egypt were investigated using sulfuric acid via batch experiments, followed by using the obtained optimum condition on bench scale leaching tests using small column. The previous optimum parameters were implemented on another large scale column in order to make more condition control and evaluate the time and reagents needed while transferring from small to large scale. The obtained data shows that leaching efficiency of GII mineralization attained about 78.3% with consumed acid amount about 34 kg/ton in a 44 days as leaching time, on the other hand, leaching efficiency of uranium from El-Missikat mineralization higher than GII mineralization and attained about 86.6% and the consumed as lower than G-II about 28kg/ton in a 40 days leaching time. Kinetics reaction models of column tests have been investigated to optimize the column leaching behavior. Based on the leaching results of the two mineralized occurrences, the rate of the uranium dissolution is controlled by both the chemical reaction and the diffusion reaction but diffusion reaction control was more predominate than a chemical reaction.

scholarly journals Sorption-desorption column tests to evaluate the attenuation layer using soil amended with a stabilising agent

2021 ◽  
Author(s):  
Tomohiro Kato ◽  
Lincoln W. Gathuka ◽  
Takaomi Okada ◽  
Atsushi Takai ◽  
Takeshi Katsumi ◽  
...  
Keyword(s):  
Column Tests

Using a High-Capacity Chemically Activated Cow Bone to Remove Fluoride: Field-Scale Column Tests and Laboratory Regeneration Studies

2017 ◽  
Vol 143 (2) ◽  
pp. 04016083 ◽  
Author(s):  
Teshome L. Yami ◽  
Jim F. Chamberlain ◽  
Elizabeth C. Butler ◽  
David A. Sabatini
Keyword(s):  
High Capacity ◽  
Field Scale ◽  
Column Tests ◽  
Cow Bone

Ranking nano-enabled hybrid media for simultaneous removal of contaminants with different chemistries: Pseudo-equilibrium sorption tests versus column tests

2017 ◽  
Vol 605-606 ◽  
pp. 166-171
Author(s):  
Tomas Custodio ◽  
Jose Garcia ◽  
Jasmina Markovski ◽  
James McKay Gifford ◽  
Kiril D. Hristovski ◽  
...  
Keyword(s):  
Simultaneous Removal ◽  
Column Tests ◽  
Equilibrium Sorption ◽  
Removal Of Contaminants

Small strain stiffness for granite residual soil: effect of stress ratio

2021 ◽  
Author(s):  
Xianwei Zhang ◽  
Xinyu Liu ◽  
Lingwei Kong ◽  
Gang Wang ◽  
Cheng Chen
Keyword(s):  
Stress Ratio ◽  
Small Strain ◽  
Residual Soil ◽  
Resonant Column ◽  
Residual Soils ◽  
Column Tests ◽  
Small Strain Stiffness ◽  
Deviator Stress ◽  
Granite Residual Soil ◽  
Stress Ratios

Most previous studies have focused on the small strain stiffness of sedimentary soil while little attention has been given to residual soils with different properties. Most studies also neglected the effects of the deviator stress, which is extensively involved in civil engineering. This note considers the effects of the deviator stress on the small-strain stiffness of natural granite residual soil (GRS) as established from resonant column tests performed under various stress ratios. Although increasing the stress ratio results in a greater maximum shear modulus for both natural and remolded residual soils, remolded soil is more sensitive to changes in the stress ratio, which highlights the effects of soil cementation. The data herein offers new insights to understand the stiffness of residual soil and other weathered geomaterials.

Adsorptive removal of As(V) by crawfish shell biochar: batch and column tests

2018 ◽  
Vol 25 (34) ◽  
pp. 34674-34683 ◽  
Author(s):  
Jinpeng Yan ◽  
Yingwen Xue ◽  
Li Long ◽  
Yifan Zeng ◽  
Xiaolan Hu
Keyword(s):  
Column Tests ◽  
Adsorptive Removal
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