Effects of silicate, sulfate, and carbonate on arsenic removal by ferric chloride

Meng, Xiaoguang; Bang, Sunbaek; Korfiatis, George P.

doi:10.1016/s0043-1354(99)00272-9

Cited by 524 publications

(326 citation statements)

References 24 publications

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“…In contrast, As (III) adsorption declined by only 8 %, in line with a previous study (Maiti et al 2013). The similar molecular structures of Si and HCO 3 − to As (III/V) anions enable their analogous adsorption behaviors, which is of crucial importance in As treatment practice (Kanematsu et al 2013;Meng et al 2000;Stachowicz et al 2008). The confounding effects of cations and anions on As adsorption were investigated, and the results demonstrate that the coexisting ions exhibited not a simple summation of individual ion effects but a compromise between them (Fig.…”

Section: As (Iii/v) Adsorption Resultssupporting

confidence: 88%

“…Such a postulation was justified by a previous study showing that the interference of Ca 2+ or Mg 2+ with HCO 3 − results in a lower effect on As adsorption/desorption on ferrihydrite than would be expected from their competitive effects alone (Saalfield and Bostick 2010). Anions including Si and HCO 3 − in groundwater usually are neutralized with divalent cations such as Ca 2+ and Mg 2+ , which would lead to positive influences in As treatment practice (Meng et al 2000). Thus, this confounding observation suggested that the interference of one single ion could be masked or eliminated due to other coexisting ions with stronger effects (Kanematsu et al 2013;Zeng et al 2008).…”

Section: As (Iii/v) Adsorption Resultsmentioning

confidence: 99%

“…Cationic calcium (Ca 2+ ) and magnesium (Mg 2+ ) generally facilitate As (V) adsorption, while exhibiting a negligible or insignificant effect on As (III) (Kanematsu et al 2013;Stachowicz et al 2008). On the other hand, coexisting anions such as phosphate (P), silicate (Si), and bicarbonate (HCO 3 − ) can suppress As adsorption (Meng et al 2000;Stachowicz et al 2008;. Though the effect of coexisting ions has been widely studied in batch systems, the compounded influence on As removal in GTiO 2 columns is still not fully understood (Bang et al 2005).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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: As (Iii/v) Adsorption Resultssupporting

confidence: 88%

Section: As (Iii/v) Adsorption Resultsmentioning

confidence: 99%

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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“…However, the substantial increase in As concentrations under anoxic conditions demonstrated that immobilization processes most likely those pertaining to the adsorption of As onto Fe oxyhydroxides/oxides precipitates had been greatly reduced. In the first couple of weeks of the experiment, the amount of As in the effluent was low because of the high Ca 2+ concentration of the effluent that enhanced adsorption through the formation of more 26 positively-charged mineral surfaces (Ghosh and Teoh, 1985;Meng et al, 2000;Stachowicz et al, 2008;Wilkie and Herring, 1996). However, this positive effect of Ca 2+ on As adsorption was only temporary, and as soon as the concentration of Ca 2+ decreased below ca.…”

Section: Arsenic Mobilization Under Anoxic Conditionsmentioning

confidence: 99%

Mobilization and speciation of arsenic from hydrothermally altered rock containing calcite and pyrite under anoxic conditions

Tabelin

Igarashi

Yoneda

2012

Applied Geochemistry

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The effects of water residence time and anoxic conditions on the mobilization and speciation of arsenic (As) in a calcite-and pyrite-bearing altered rock excavated during a road-tunnel project has been evaluated using batch and column laboratory experiments. Higher infiltration rates (i.e., shorter water residence times) enhanced the leaching of As due to the higher pH values of the effluents and more rapid transport of dissolved As through the columns. The concentration of As in the effluent also increased under anoxic conditions regardless of the water residence time.This enhanced leaching of As under anoxic conditions could be attributed to a significant pH increase and decreased Fe oxyhydroxides/oxides precipitation compared to similar experiments done under ambient conditions. Processes that controlled the evolution of pH and the temporal release mechanisms of As under anoxic conditions were identical to those previously observed under ambient conditions: the dissolution of soluble phases, pyrite oxidation, co-precipitation and/or adsorption/desorption reactions. Speciation of As in the column experiments could partly be attributed to the pH-dependent adsorption of As species onto Fe oxyhydroxides/oxides precipitates. Moreover, apparent equilibriums of the total As and arsenite (As[III]) concentrations were delayed under anoxic conditions in both batch and column experiments.

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“…It was reported that a high concentration of carbonate inhibited aqueous arsenic removal by coagulation/precipitation [11,12]. The complex chemical composition of the RM, especially the high concentration of alkalinities, could affect the arsenic immobilization efficiency.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of arsenic immobilization in red mud by CO2 or waste acid acidification combined ferrous (Fe2+) treatment

Wang

Peng

et al. 2012

Journal of Hazardous Materials

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Effects of silicate, sulfate, and carbonate on arsenic removal by ferric chloride

Cited by 524 publications

References 24 publications

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

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

Mobilization and speciation of arsenic from hydrothermally altered rock containing calcite and pyrite under anoxic conditions

Evaluation of arsenic immobilization in red mud by CO2 or waste acid acidification combined ferrous (Fe2+) treatment

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