A modified batch reactor system to study equilibrium-reactive transport problems

Jeppu, Gautham P.; Clement, T. Prabhakar; Barnett, Mark O.; Lee, Kang‐Kun

doi:10.1016/j.jconhyd.2011.10.004

Cited by 14 publications

(4 citation statements)

References 45 publications

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“…This limitation was mainly due to the fact that adsorption equilibrium at local micro-interfacial areas in a column is hard to reach without sufficient contact time (Zhang and Selim 2006). Thus, PHREEQC, derived from equilibrium conditions, could incorporate the kinetics block when elevating column modeling from batch experiments (Jeppu et al 2012).…”

Section: Field Column Resultsmentioning

confidence: 99%

“…Second, systematic study on the influence of variation of empty bed contact time (EBCT) has been limited, though EBCT can regulate As breakthrough curves (Zeng et al 2008). Third, the parameters obtained from batch adsorption results should be used with caution when designing column experiments (Jeppu et al 2012;Zhang and Selim 2006). These challenges motivate us to explore the effect of EBCT in treating elevated As groundwater and to integrate batch and column results.…”

Section: Introductionmentioning

confidence: 99%

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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: 99%

Section: Introductionmentioning

confidence: 99%

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

Cui

et al. 2014

Environ Sci Pollut Res

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“…Data were tested for normality and equal variance prior to hypothesis testing. Single pairwise comparisons of normally-distributed and equal-variant (NDEV) data were analyzed with the Student's t -test; multiple pairwise comparisons of NDEV data were analyzed with the Holm-Bonferroni corrected t -test (Holm, 1979 ) following a statistically significant ANOVA result. Data that violated assumptions of normality and equal variance were analyzed with Kruskal-Wallis and Mann-Whitney U -tests as indicated.…”

Section: Methodsmentioning

confidence: 99%

Inherited macular degeneration-associated mutations in CNGB3 increase the ligand sensitivity and spontaneous open probability of cone cyclic nucleotide-gated channels

2015

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Cyclic nucleotide gated (CNG) channels are a critical component of the visual transduction cascade in the vertebrate retina. Mutations in the genes encoding these channels have been associated with a spectrum of inherited retinal disorders. To gain insight into their pathophysiological mechanisms, we have investigated the functional consequences of several CNGB3 mutations, previously associated with macular degeneration (Y469D and L595F) or complete achromatopsia (S156F, P309L, and G558C), by expressing these subunits in combination with wild-type CNGA3 in Xenopus oocytes and characterizing them using patch-clamp recordings in the inside-out configuration. These mutations did not prevent the formation of functional heteromeric channels, as indicated by sensitivity to block by L-cis-diltiazem. With the exception of S156F, each of the mutant channels displayed electrophysiological properties reflecting enhanced channel activity at physiological concentrations of cGMP (i.e., a gain-of-function phenotype). The increased channel activity produced by these mutations resulted from either increased functional expression levels, or increased sensitivity to cyclic nucleotides. Furthermore, L595F increased the spontaneous open probability in the absence of activating ligand, signifying a ligand independent gain-of-function change. In addition to the CNGB3 disease-associate mutations, we characterized the effects of several common CNGB3 and CNGA3 single-nucleotide polymorphisms (SNPs) on heteromeric CNGA3+CNGB3 channel function. Two of the SNPs examined (A3-T153M, and B3-W234C) produced decreased ligand sensitivity for heteromeric CNG channels. These changes may contribute to background disease susceptibility when combined with other genetic or non-genetic factors. Together, these studies help to define the underlying molecular phenotype for mutations relating to CNG channel disease pathogenesis.

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“…To understand of the evolution of the diagenetic processes and predict the oil reservoirs quality, numerical modeling of transport and reaction is a fundamental tool for professionals in the geoscience area (Jeppu et al, 2012). Chemical properties of minerals and their interactions with fluids of different compositions is a basic of the models.…”

Section: Introductionmentioning

confidence: 99%

Computer Codes of Geochemical Modeling Used to Water-Rock Interaction Simple and Complex Systems

Klunk¹,

Dasgupta²,

Das³

et al. 2019

PTQ

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The numerical modeling of transport and reaction was used for the understanding of the evolution of the diagenetic processes and their importance in the characterization and prediction of oil reservoir quality. Geochemical models are represented by numerical equations based on the physical-chemical properties of minerals. There are many software’s available in the market to simulate systems and geochemical reactions. The codes are divided into three distinct categories: coupled transport of reaction, modeling speciation, and batch mode according to the numerical method. Simple systems have clear connections between inputs and outputs. Complex systems have multiple factors that provide a probability distribution of data inputs that interact in specific functions. The outputs produced as a result are therefore impossible to predict with complete accuracy. Several research groups tried to develop numerical codes for geochemical modeling. The critical factors for the use of these systems are (i) verification of the simulation results with empirical data set and (ii) sensitivity analysis of these results, for the construction of general models which provide a predictive character. This last factor is particularly important as it establishes the qualitative and quantitative impact of each parameter in the simulations. Thus, with a complete numerical model diagenetic, it is possible to perform various simulations modifying one or the other parameter to test the sensitivity in the construction of these different geological scenarios. This set includes mineral composition and texture, the composition of fluids, paragenetic sequence, and burial history. This work brings fundamental concepts related to this topic as well as an analysis of commercial software available.

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A modified batch reactor system to study equilibrium-reactive transport problems

Cited by 14 publications

References 45 publications

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

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

Inherited macular degeneration-associated mutations in CNGB3 increase the ligand sensitivity and spontaneous open probability of cone cyclic nucleotide-gated channels

Computer Codes of Geochemical Modeling Used to Water-Rock Interaction Simple and Complex Systems

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