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Colloids are known to be the often neglected phase for the transport of pollutants in aquatic ecosystems. The book covers the basics of abiotic colloid characterization, of biocolloids and biofilms, the resulting transport phenomena and their.
Table of contents
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- Postdoc in colloidal transport in porous media of DNA-tagged nano-particles
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-  Colloidal Transport in Locally Periodic Evolving Porous Media -- An Upscaling Exercise
Environ Sci Technol. Continuous immobilization of cadmium and lead in biochar amended contaminated paddy soil: A five-year field experiment. Ecol Eng. Colloid-facilitated Pb transport in two shooting-range soils in Florida. J Hazard Mater. Transport of vanadium V in saturated porous media: effects of pH, ionic-strength and clay mineral.
Chem Spec Bioavailab. Effects of humic acid and solution chemistry on the retention and transport of cerium dioxide nanoparticles in saturated porous media. Water Air Soil Pollution. A variety of inorganic and organic colloids exist in natural soils. The high surface area of colloid particles make them capable to adsorb various organic and inorganic contaminants including heavy metals [ 7 Ben-Moshe T , Dror I , Berkowitz B. Transport of metal oxide nanoparticles in saturated porous media. For example, colloidal montmorillonite can govern Pb II and Cd II transport because of large specific surface area, high cation exchange capacity and reaction amphoteric hydroxyl groups [ 8 Lenoble V , Bouras O , Deluchat V , et al.
Arsenic adsorption onto pillared clays and iron oxides. J Colloid Interface Sci.
Macromolecular changes of humic substances induced by interaction with organic acid. Eur J Soil Sci. The presence of carboxylic and phenolic groups result in HA carries negative charges predominantly, it thus has a high affinity for metallic cations in aqueous solutions [ 10 Akkanen J , Kukkonen JVK. Effects of water hardness and dissolved organic material on bioavailability of selected organic chemicals. Environ Toxicol Chem. Manual loessial soil colloids contain minerals, organic matter and other substances and thus exhibit the properties of inorganic and organic colloids [ 11 Luo X , Yu L , Wang C , et al.
Sorption of vanadium V onto natural soil colloids under various solution pH and ionic strength conditions. Previous studies have reported that mobile colloids can facilitate heavy metals transport from soils to groundwater and the presence of montmorillonite and HA have significant impact on groundwater Pb II pollution [ 12 Tang XY , Weisbrod N. Colloid-facilitated transport of lead in natural discrete fractures. Environ Pollut. Colloid deposition and release in soils and their association with heavy metals. Crit Rev Environ Sci Technol. Exploring the effect of organic matter on the interactions between mineral particles and cations with Wien effect measurements.
J Soils Sediments. Comparative study of lead sorption onto natural perlite, dolomite and diatomite. Chem Eng J. Previous studies have shown the relationship between a single heavy metal and colloids, but there are less works focused on the co-transport of multiple heavy metals with soil colloids in porous media.
It is therefore critical to conduct a systematic study on colloid deposition and released in porous media and their association with both Pb II and Cd II. The main factors controlling the transport of heavy metals in porous media can be classified as follows: chemical factors such as pH, ionic strength and heavy metal type; and physical factors such as flow rate, medium grain size and influent concentration [ 16 Wang D , Paradelo M , Bradford SA , et al.
Facilitated transport of Cu with hydroxyapatite nanoparticles in saturated sand: effects of solution ionic strength and composition. Water Res.
The isotherms of heavy metals competitive adsorption suggest that there is different selective adsorption sequence for multi-metal adsorption, which can be interpreted by their electronegativity, hydrolytic ability, Misono softness parameter, first hydrolysis constant [ 17 Srivastava P , Singh B , Angove M. Competitive adsorption behavior of heavy metals on kaolinite. Adsorption of heavy metals in acid to alkaline environments by montmorillonite and Ca-montmorillonite. Increased flow rate and decreased sand grain size also have strong impact on the fate and transport of heavy metal contaminants in porous media [ 19 Syngouna VI , Chrysikopoulos CV.
Postdoc in colloidal transport in porous media of DNA-tagged nano-particles
Cotransport of clay colloids and viruses in water saturated porous media. Review of key factors controlling engineered nanoparticle transport in porous media. The main purpose of this work was to investigate the effect of colloids on the co-transport of Pb II and Cd II in saturated porous media under different physical conditions. Quartz sand was used as porous media for the column experiments. The specific objectives of the research were as follows: 1 compare Pb II and Cd II transport with different types of colloids, 2 determine the effect of flow rate and grain size on retention and transport of Pb II and Cd II with different types of colloids.
Montmorillonite Shanghai Fengxian Fengcheng Chemical Reagent Company, Shanghai, China colloids and manual loessial soil colloids were prepared according to the procedure of Gao et al. Deposition and mobilization of clay colloids in unsaturated porous media. Water Resour Res.
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The fraction of colloids in suspension were collected as experimental colloids and the concentrations were determined gravimetrically. Effect of dissolved organic matter on the stability of magnetite nanoparticles under different pH and ionic strength conditions. Sci Total Environ. Microsc Res Tech.
Before experiment, the quartz sand was washed sequentially by 0. A plexiglass column of 3 cm in diameter and 15 cm in height was wet-packed with quartz sand [ 25 Tian Y , Gao B , Silvera-Batista C , et al.
Transport of engineered nanoparticles in saturated porous media. J Nanoparticle Res. Once packed, flow in the column was induced in an upward direction using a peristaltic pump.
 Colloidal Transport in Locally Periodic Evolving Porous Media -- An Upscaling Exercise
The transport experiment consisted of two injection stages. At stage one, contaminant solution was injected into the column for about 2. At stage two, the column was leached with manual loessial soil colloid, montmorillonite colloid, colloidal HA and DI water blank control for 5 pore volumes PVs at the same flow rate as the stage one, respectively. In addition, 0. The exceptional property of DNA-tagging is the infinite number of unique tracers that can be produced and their detectability at extreme low concentrations. Such tracers give the water sector a unique tool for in-situ mapping of transport of contaminants and pathogenic microorganisms in water systems and alternative drinking water production sites e.
The objective is to quantify the behavior of a set of tailored DNA-tracers which will advance environmental research in general and water research and knowledge in particular. The post-doc plays a crucial role in testing the DNA-tagged nano-particles. The specific tasks are:. The work is carried out at IHE Delft dr. Foppen and Delft University of Technology dr.
The work is performed in close collaboration with several labs in Europe e. Work visits to these labs are foreseen. It is expected that the successful candidate will participate in all meetings and workshops organized by the research group. The candidate must be willing to disseminate the results within the project during the meetings, but also and in particular through.
TU Delft offers a customisable compensation package, a discount for health insurance and sport memberships, and a monthly work costs contribution. Flexible work schedules can be arranged. Free Preview. Presents analytical, chemical, microbiological, geological and hydrological aspects of material transport by colloidal processes in aquatic systems and soils Provides includes theoretical considerations, results from model experiments, and field studies The contributors are leading specialists from around the world see more benefits.