scholarly journals Determining Adsorption Parameters of Potentially Contaminant-Releasing Materials Using Batch Tests with Differing Liquid-Solid Ratios

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2534
Author(s):  
Hirofumi Sakanakura ◽  
Kenichi Ito ◽  
Jiajie Tang ◽  
Mikako Nakagawa ◽  
Hiroyuki Ishimori
Keyword(s):  
Dispersion Model ◽  
Test Procedure ◽  
Coal Ash ◽  
Adsorption Parameters ◽  
Water Contact ◽  
Parallel Test ◽  
Solid Ratio ◽  
Advection Dispersion ◽  
Batch Tests ◽  
Other Substances

Adsorption parameters such as the distribution coefficient are required to predict the release behavior of contaminants using advection-dispersion models. However, for potentially contaminant-releasing materials (PCMs) such as dredged sludge and coal ash, these parameters cannot be obtained by conventional adsorption tests. This study developed a method to determine adsorption parameters for PCMs from a set of batch tests conducted in parallel as a function of the liquid-solid ratio (LS-parallel test). This LS-parallel test was performed on sandy soil derived from marine sediment using liquid-solid ratios from 1 to 300 L/kg. The water-contact time was also changed from 10 min to 28 d to elucidate the kinetics or equilibrium of contaminants released from the sample. Adsorption parameters were successfully obtained if the substance was under adsorption control. A column percolation test was performed to confirm the effectiveness of the obtained parameters. Good agreements were observed for SO42− and B, but discrepancies remained for other substances such as F− and as suggesting that improvements are necessary in both the LS-parallel test procedure and the advection-dispersion model.

scholarly journals Seasonal Variation of Drainage System in the Lower Ablation Area of a Monsoonal Temperate Debris-Covered Glacier in Mt. Gongga, South-Eastern Tibet

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1050 ◽  
Author(s):  
Qiao Liu ◽  
Shiyin Liu ◽  
Wulong Cao
Keyword(s):  
Seasonal Variation ◽  
Dispersion Model ◽  
Drainage System ◽  
Hydrodynamic Dispersion ◽  
Ablation Area ◽  
Advection Dispersion ◽  
Dye Tracer ◽  
Eastern Tibet ◽  
Glacier Ice ◽  
Subglacial Drainage

Seasonal evolution of the subglacial drainage system in the lower ablation area of the Hailuogou glacier ice tongue were revealed by repeated dye tracer (Rhodamine WT) experiments during the 2009 ablation season. Between April and October, 18 dye tracer experiments were conducted by injecting the tracer at one location of the lower ablation area of the Hailuogou Glacier to diagnose the seasonal variation of the subglacial drainage system of this section of glacier ice tongue. Using a simple advection-dispersion model (ADM), the flow velocity, hydrodynamic dispersion coefficient, and degree of tracer spreading were deduced. Tracer transit velocity through the tested subglacial channel varied from 0.148 to 0.555 m s−1 during the 2009 ablation season. Dispersivity showed a relatively high value than that found at other glaciers, which varied between 27.05 and 287.49 m2 s−1. Seasonal changes of these indexes indicated that the subglacial drainage system of the lower ablation area of the Hailougou Glacier is a relatively stable existing system in the case of its longitudinal shape, whereas its hydraulic efficiency is low in the early and late ablation seasons and high during the middle of summer due to subglacial channel expansion.

scholarly journals Numerical Solution of a 3-D Advection-Dispersion Model for Dissolved Oxygen Distribution in Facultative Ponds

2018 ◽  
Vol 31 ◽  
pp. 03006 ◽  
Author(s):  
Sunarsih ◽  
Dwi P. Sasongko ◽  
Sutrisno
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Dispersion Model ◽  
Oxygen Distribution ◽  
Dissolved Oxygen Concentration ◽  
3 Dimensional ◽  
Advection Dispersion ◽  
Advection Diffusion Equation ◽  
Advection Diffusion ◽  
The Finite Difference Method

This paper describes a mathematical model for the dissolved oxygen distribution in the plane of a facultative pond with a certain depth. The purpose of this paper is to determine the variation of dissolved oxygen concentration in facultative ponds. The 3-dimensional advection-diffusion equation is solved using the finite difference method Forward Time Central Space (FTCS). Numerical results show that the aerator greatly affects the occurrence of oxygen concentration variations in the facultative pond in the certain depth. The concentration of dissolved oxygen decreases as the depth of the pond increases.

scholarly journals Fractional and fractal advection-dispersion model

2021 ◽  
Vol 0 (0) ◽  
pp. 0
Author(s):  
Amy Allwright ◽  
Abdon Atangana ◽  
Toufik Mekkaoui
Keyword(s):  
Dispersion Model ◽  
Advection Dispersion

scholarly journals Research on Optimal Proportion and Performance of Cement-Clay Slurry

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Peili Su ◽  
Feng Liu ◽  
Peng Yao ◽  
Yifei Jia ◽  
Chong Li
Keyword(s):  
Setting Time ◽  
Coal Ash ◽  
Superior Performance ◽  
Mass Ratio ◽  
Element Analysis ◽  
Solid Ratio ◽  
Clay Slurry ◽  
And Performance ◽  
Material Setting ◽  
Composite Slurry

For the cement-clay slurry commonly used in dynamic water grouting, consider adding coal ash to optimize the performance of cement-clay slag composite slurry and discuss the reaction mechanism of the slurry through microchemical element analysis; the orthogonal test was used to study the influence of various factors on material setting time, solidification ratio, water segregation rate, and the optimized ratio of the slurry that was obtained by integrating the unconfined compressive strength of grouting concretion body and slurry configuration cost. The results showed that the water-solid ratio had the greatest influence on the comprehensive performance, followed by the amount of coal ash admixture. The best performance of the composite slurry was obtained with a water-solid ratio of 0.8:1 and a cement:coal ash:clay:quicklime:sodium sulfate:water mass ratio of 1:0.45:0.20:0.05:0.07:1.32. Finally, by comparing the mechanical properties of the optimized slurry and the grouting concretion body, it is proved that the optimized slurry has superior performance to meet the general grouting project requirement.

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