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Articles 1 - 6 of 6
Full-Text Articles in Engineering
Developments On Wetting Effects In Microfluidic Slug Flow, Rafael M. Santos, Masahiro Kawaji
Developments On Wetting Effects In Microfluidic Slug Flow, Rafael M. Santos, Masahiro Kawaji
Faculty Publications and Scholarship
Wetting effects form a dimension of fluid dynamics that becomes predominant, precisely controllable and possibly useful at the micro-scale. Microfluidic multiphase flow patterns, including size, shape and velocity of fluidic particles, and mass and heat transfer rates are affected by wetting properties of microchannel walls and surface tensions forces between fluid phases. The novelty of this field, coupled to difficulties in experimental design and measurements, means that literature results are scarce and scientific understanding is incomplete. Numerical methods developed recently have enabled a shortcut in obtaining results that can be perceived realistic, and that offer insight otherwise not possible. In …
Stabilization Of Basic Oxygen Furnace Slag By Hot-Stage Carbonation Treatment., Rafael M. Santos, Da Ling, Amin Sarvaramini, Muxing Guo, Jan Elsen, Faïçal Larachi, Georges Beaudoin, Bart Blanpain, Tom Van Gerven
Stabilization Of Basic Oxygen Furnace Slag By Hot-Stage Carbonation Treatment., Rafael M. Santos, Da Ling, Amin Sarvaramini, Muxing Guo, Jan Elsen, Faïçal Larachi, Georges Beaudoin, Bart Blanpain, Tom Van Gerven
Faculty Publications and Scholarship
Treatment and disposal of Basic Oxygen Furnace (BOF) slag, a residue of the steel production process characterized by high basicity and propensity for heavy metal leaching, is a costly burden on metallurgical plants; a sustainable valorization route is desired. The stabilization of BOF slag utilizing hot-stage carbonation treatment was investigated; this approach envisions carbonation during the hot-to-cold pathway followed by the material after the molten slag is poured and solidified. Three experimental methodologies were employed: (i) in-situ thermogravimetric analyzer (TGA) carbonation was used to assess carbonation reaction kinetics and thermodynamic equilibrium at high temperatures; (ii) pressurized basket reaction carbonation was …
Strategic Selection Of An Optimal Sorbent Mixture For In-Situ Remediation Of Heavy Metal Contaminated Sediments: Framework And Case Study, Yi Wai Chiang, Rafael M. Santos, Karel Ghyselbrecht, Valérie Cappuyns, Johan A. Martens, Rudy Swennen, Tom Van Gerven, Boudewijn Meesschaert
Strategic Selection Of An Optimal Sorbent Mixture For In-Situ Remediation Of Heavy Metal Contaminated Sediments: Framework And Case Study, Yi Wai Chiang, Rafael M. Santos, Karel Ghyselbrecht, Valérie Cappuyns, Johan A. Martens, Rudy Swennen, Tom Van Gerven, Boudewijn Meesschaert
Faculty Publications and Scholarship
Aquatic sediments contaminated with heavy metals originating from mining and metallurgical activities of aquatic sediments poses significant risk to the environment and human health due to the fact that these sediments not only act as a sink for heavy metals, but can also constitute a secondary source of heavy metal contamination. A variety of sorbent materials has demonstrated the potential to immobilize heavy metals. However, the complexity of multi-element contamination makes choosing the appropriate sorbent mixture and application dosage highly challenging. In this paper, a strategic framework is designed to systematically address the development of an in-situ sediment remediation solution …
Adsorption Of Multi-Heavy Metals Onto Water Treatment Residuals: Sorption Capacities And Applications, Yi Wai Chiang, Karel Ghyselbrecht, Rafael M. Santos, Johan A. Martens, Rudy Swennen, Valérie Cappuyns, Boudewijn Meesschaert
Adsorption Of Multi-Heavy Metals Onto Water Treatment Residuals: Sorption Capacities And Applications, Yi Wai Chiang, Karel Ghyselbrecht, Rafael M. Santos, Johan A. Martens, Rudy Swennen, Valérie Cappuyns, Boudewijn Meesschaert
Faculty Publications and Scholarship
Inherently formed iron-based water treatment residuals (WTRs) were tested as alternative sorbents for multi-heavy metal removal from synthetic solutions, contaminated sediments, and surface waters. The WTRs were mainly composed of iron (hydr)oxides and had a high BET surface area (170.7 m2/g), due to the presence of micro- and mesopores. The sorption capacity of WTRs for As(V), Cd2+, Pb2+ and Zn2+ from synthetic solutions surpassed that of a commercially available goethite by 100-400% for single contaminant tests, and by 240% for total sorption in multi contaminant tests. The maximum sorption capacity of WTRs towards As(V), …
Synthesis Of Zeolitic-Type Adsorbent Materials From Municipal Solid Waste Incinerator Bottom Ash And Its Application In Heavy Metal Adsorption, Yi Wai Chiang, Karel Ghyselbrecht, Rafael M. Santos, Boudewijn D. Meesschaert, Johan A. Martens
Synthesis Of Zeolitic-Type Adsorbent Materials From Municipal Solid Waste Incinerator Bottom Ash And Its Application In Heavy Metal Adsorption, Yi Wai Chiang, Karel Ghyselbrecht, Rafael M. Santos, Boudewijn D. Meesschaert, Johan A. Martens
Faculty Publications and Scholarship
Municipal solid waste incinerator (MSWI) bottom ash (BA) was converted to zeolitic-type adsorbent materials by hydrothermal conversion under strongly alkaline conditions. The conversion product was determined to be a mixture of sodium aluminum silicate hydrate (SASH) (Na2O·Al2O3·1.68SiO2·1.73H2O) and tobermorite (Ca5Si6O16(OH)2·4H2O). The BET specific surface area was 22.1 m2/g, which represented a significant gain compared to the BA (4.6 m2/g) due to the formation of micropores and mesopores. The converted BA demonstrated promising performance for application as a sorbent towards several heavy metals (oxyanions of As(V), and Cd2+, Co2+, Ni2+, Pb2+, and Zn2+). Its performance was found to be generally superior …
Synthesis Of Pure Aragonite By Sonochemical Mineral Carbonation., Rafael M. Santos, Pieter Ceulemans, Tom Van Gerven
Synthesis Of Pure Aragonite By Sonochemical Mineral Carbonation., Rafael M. Santos, Pieter Ceulemans, Tom Van Gerven
Faculty Publications and Scholarship
The objective of this work was to promote the formation of the aragonite polymorph of calcium carbonate, which has some valuable applications in industry, via the mineral carbonation route. The combination of ultrasound with magnesium ions promoted the formation of pure aragonite crystals at optimum conditions. It was possible to synthesize high purity aragonite precipitates at temperatures ranging from 24 oC to 70 oC, with the resulting powders possessing varying particle size distributions (from sub-micron up to 20 μm) and crystal morphologies (from acicular needles to novel hubbard squash-like particles). Several process parameters were found to influence the …