Reactive transport of gentisic acid in a hematite-coated sand column: Experimental study and modeling

Hanna, Khalil; Rusch, B.; Lassabatère, Laurent; Hofmann, Annette; Humbert, Bernard

doi:10.1016/j.gca.2010.03.022

Cited by 28 publications

(29 citation statements)

References 55 publications

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“…The minute differences in the optimized adsorption constants (logK) among different columns reflect the slight variation in adsorption conditions. This fine-tuning approach is similar to previous studies where the parameters obtained from batch adsorption have to be modified to satisfactorily approximate the column data (Hanna et al 2010;Jing et al 2009). For example, the surface area had to be decreased to simulate a gentisic acid transport process in hematite-coated sand column according to batch experiments due to inaccessibility of the reactive surface sites (Hanna et al 2010).…”

Section: Field Column Resultsmentioning

confidence: 86%

Groundwater arsenic removal using granular TiO2: integrated laboratory and field study

Cui

et al. 2014

Environ Sci Pollut Res

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High concentrations of arsenic (As) in groundwater pose a great threat to human health. The motivation of this study was to provide a practical solution for As-safe water in As geogenic areas using granular TiO 2 (GTiO 2 ). The kinetics results indicated that the As (III/V) adsorption on GTiO 2 conformed to the Weber-Morris (WM) intraparticle diffusion model. The Langmuir isotherm results suggested that the adsorption capacities for As (III) and As (V) were 106.4 and 38.3 mg/g, respectively. Ion effect study showed that cationic Ca and Mg substantially enhanced As (V) adsorption, whereas no significant impact was observed on As (III). Silicate substantially decreased As (V) adsorption by 57 % and As (III) by 50 %. HCO 3 − remarkably inhibited As (V) adsorption by 52 %, whereas it slightly reduced As (III) adsorption by 8 %. Field column results demonstrated that ∼700 μg/L As was removed at an empty bed contact time (EBCT) of 1.08 min for 968 bed volumes before effluent As concentration exceeded 10 μg/L, corresponding to 0.96 mg As/g GTiO 2 . Two household filters loaded with 110 g GTiO 2 in the on-off operational mode can provide 6-L/day As-safe drinking water up to 288 and 600 days from the groundwater containing ∼700 μg/L As and ∼217 μg/L As, respectively. Integration of batch experiments and column tests with systematic variation of EBCTs was successfully achieved using PHREEQC incorporating a charge distribution multisite complexation (CD-MUSIC) model and one-dimensional reactive transport block.

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Section: Field Column Resultsmentioning

confidence: 86%

Groundwater arsenic removal using granular TiO2: integrated laboratory and field study

Cui

et al. 2014

Environ Sci Pollut Res

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“…(3) to be about 7.4, 7.8 and 7.9 mg g À1 for RCS and 77.1, 81.9 and 97.2 mg g À1 for Mg-B for initial lead(II) concentrations of 25, 50 and 100 mg L À1 , respectively. These adsorption capacities were significantly lower than the ones obtained in batch mode (See section 3.2) which could be due to the fact that in batch mode, the adsorbents particles move freely in the aqueous solutions which provides better interactions between active sites of the solid matrixes and lead ions, therefore leading to a higher mass transfer rate and consequently a higher lead retention efficiency (Bulgariu and Bulgariu, 2013;Calero et al, 2013;Hanna et al, 2010). On the other hand, for both RCS and Mg-B, the higher the used initial lead(II) concentration, the faster the appearance of the lead BTCs ( Fig.…”

Section: Lead Btcsmentioning

confidence: 76%

“…Contrary to CXTFIT, Hydrus 1D offers the possibility of BTCs prediction assuming non-linear sorption and even of reactive pollutants in presence of physical and/or chemical non-equilibrium processes. The vertical 1D transport of a non volatile and non biodegradable solute in either saturated or non saturated porous media can be described by the convection-dispersion equation as (Hanna et al, 2010):…”

Section: Hydrus 1d Modelmentioning

confidence: 99%

“…They demonstrated that the rates of pollutants migration depend on a wide range of physical and chemical porous media characteristics such as permeability, porosity, dispersivity, interconnectivity of macropores, mineralogy and organic constitution (Jacques et al, 2008;K€ ohne et al, 2009). The models that successfully predict the transport of the studied chemicals are found to be those taking into account the physical and/or chemical non-equilibrium processes related mainly to both heterogeneous flow and time dependent adsorption process (Hanna et al, 2010;Suarez et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Lead removal from aqueous solutions by raw sawdust and magnesium pretreated biochar: Experimental investigations and numerical modelling

Jellali

Diamantopoulos

Haddad

et al. 2016

Journal of Environmental Management

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“…Mass balance of colloidal particles is between 0.69 and 0.96 (Table 3), attesting to irreversible retention of colloidal particles in porous medium. As conventionally used in transfer modeling [25] [37] [38] and as a first attempt, it was considered that hydrodispersive parameters applied to reactive solutes. The model was then fitted to experimental data by optimizing only the reactive parameters.…”

Section: Transfer and Retention Of Colloidal Particlesmentioning

confidence: 99%

Tracing Water Flow and Colloidal Particles Transfer in an Unsaturated Soil

Predelus¹,

Lassabatère²,

Coutinho³

et al. 2014

JWARP

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In recent years, many studies have been carried out on colloidal particle transfer in the unsaturated zone because they can be a risk to the environment either directly or as a vector of pollutants. A study was conducted on the influence of porous media structure in unsaturated conditions on colloidal particle transport. Three granular materials were set up in columns to replicate a fluvio-glacial soil from the unsaturated zone in the Lyon area (France). It is a sand, a bimodal mixture in equal proportion by weight of sand and gravel, and a fraction of bimodal mixture. Nanoparticles of silica (SiO2-Au-FluoNPs), having a hydrodynamic diameter between 50 and 60 nm, labeled by organic fluorescent molecules were used to simulate the transport of colloidal particles. A nonreactive tracer, bromide ion (Br − ) at a concentration of C0,s = 10 −2 M was used to determine the hydrodispersive properties of porous media. The tests were carried out first, with a solution of nanoparticles (C0,p = 0.2 g/L) and secondly, with a solution of nanoparticles and bromine. The transfer model based on fractionation of water into two phases, mobile and immobile, MIM, correctly fits the elution curves. The retention of colloidal particles is greater in the two media of bimodal particle size than that in the sand, which clearly demonstrates the role of textural heterogeneity in the retention mechanism. The increase in ionic strength produced by alimenting the columns with colloidal particle suspension in the presence of bromide, increases retention up to 25% in the sand. The total concentration profile of nanoparticles collected at the end of the experiment shows that the colloidal particles are retained primarily at the entrance of the columns. Hydrodispersive calculated parameters indicate that flow is more heterogeneous in bimodal media compared to sand. Keywords 697

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Reactive transport of gentisic acid in a hematite-coated sand column: Experimental study and modeling

Cited by 28 publications

References 55 publications

Groundwater arsenic removal using granular TiO2: integrated laboratory and field study

Groundwater arsenic removal using granular TiO2: integrated laboratory and field study

Lead removal from aqueous solutions by raw sawdust and magnesium pretreated biochar: Experimental investigations and numerical modelling

Tracing Water Flow and Colloidal Particles Transfer in an Unsaturated Soil

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