COMSOL multiphysics 3.5a package for simulating the cadmium transport in the sand bed-bentonite low permeable barrier

Document identifier: oai:DiVA.org:ltu-77759
Access full text here:10.1016/j.jksus.2020.01.047
Keyword: Engineering and Technology, Civil Engineering, Geotechnical Engineering, Teknik och teknologier, Samhällsbyggnadsteknik, Geoteknik, Low permeable barrier, Iraqi bentonite, Cadmium, Isotherm models, COMSOL package, Soil Mechanics
Publication year: 2020
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructureSDG 6 Clean water and sanitation
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

Here, batch study for Iraqi bentonite-cadmium aqueous solution interaction was conducted with condi- tions of contact time ::; 120 min, sorbent dosage from 0.05 to 1 g per 100 mL and shaking speed from 50 to 300 rpm for initial concentration of 50 mg/L with initial pH of 3 to simulate the acetogenic phase in the sanitary landfill. The best conditions were 1 h, 0.7 g/100 mL and 250 rpm, respectively to obtain the high- est removal (90%). The sorption data were well formulated by Freundlich and Langmuir models with determination coefficient (R2) 2: 0.98 and sorption capacity of 145.3 mg/g; so, the removal process gov- erned by the physico-chemical forces. The average coefficient of the hydraulic conductivity was found equal to 1.98 x 10-10 m/s and this is suitable for low permeable barrier (LPB). Finally, the predictions of COMSOL package were presented satisfactory simulation for the cadmium concentrations within two-dimensional physical model packed with sand aquifer and Iraqi bentonite. Two configurations of LPB were evaluated for restriction of contaminant front migration and the results proved that the sur- rounding of the location required to protect it from three sides against to the flow direction can be more dependable from continuous configuration.

Authors

Ayad A.H. Faisal

Department of Environmental Engineering, College of Engineering, University of Baghdad, Iraq
Other publications >>

Manal M. Ibreesam

Department of Environmental Engineering, College of Engineering, University of Baghdad, Iraq
Other publications >>

Nadhir Al-Ansari

Luleå tekniska universitet; Geoteknologi
Other publications >>

Laith A. Naji

Department of Environmental Engineering, College of Engineering, University of Baghdad, Iraq
Other publications >>

Mu. Naushad

Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
Other publications >>

Tansir Ahamad

Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
Other publications >>

Documents attached


Click on thumbnail to read

Record metadata

Click to view metadata