Bangladesh and Vietnam: Different Groundwater Compositions Require Different Approaches to Arsenic Mitigation

Hug, Stephan J.; Leupin, Olivier X.; Berg, Michael

doi:10.1021/es7028284

Cited by 101 publications

(113 citation statements)

References 23 publications

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“…These in situ formed iron surface sites could also contribute to As adsorption (Maiti et al 2013). A similar observation was also reported in filtration experiments for groundwater As removal (Hug et al 2008;Leupin et al 2005).…”

Section: Field Column Resultssupporting

confidence: 73%

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 Resultssupporting

confidence: 73%

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

Cui

et al. 2014

Environ Sci Pollut Res

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“…In order to emphasize the applicability of our new MGNC adsorbent to remove arsenate from the natural system, As(V)-contaminated groundwater was artificially prepared from distilled water spiked with arsenate and other commonly found cations and anions, as previously described in the literatures (Table 3), 19,20 and the remediation process was tested. One liter of artificial contaminated groundwater spiked with arsenate (0.6 mg/L) along with the various cations and anions was treated with 1.0 g of 100 nm MGNCs in the Erlenmeyer flask, as shown in Graphical Abstract.…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Arsenic Using Magnetic Multi-Granule Nanoclusters

Lee¹,

Cha²,

Sim³

et al. 2014

Bulletin of the Korean Chemical Society

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Magnetic multi-granule nanoclusters (MGNCs) were investigated as an inexpensive means to effectively remove arsenic from aqueous environment, particularly groundwater sources consumed by humans. Various size MGNCs were examined to determine both their capacity and efficiency for arsenic adsorption for different initial arsenic concentrations. The MGNCs showed highly efficient arsenic adsorption characteristics, thereby meeting the allowable safety limit of 10 g/L (ppb), prescribed by the World Health Organization (WHO), and confirming that 0.4 g and 0.6 g of MGNCs were sufficient to remove 0.5 mg/L and 1.0 mg/L of arsenate (AsO4 3 ) from water, respectively. Adsorption isotherm models for the MGNCs were used to estimate the adsorption parameters. They showed similar parameters for both the Langmuir and Sips models, confirming that the adsorption process in this work was active at a region of low arsenic concentration. The actual efficiency of arsenate removal was then tested against 1 L of artificial arsenic-contaminated groundwater with an arsenic concentration of 0.6 mg/L in the presence of competing ions. In this case, only 1.0 g of 100 nm MGNCs was sufficient to reduce the arsenic concentrations to below the WHO permissible safety limit for drinking water, without adjusting the pH or temperature, which is highly advantageous for practical field applications.

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“…But in this study, there was significantly a positive relationship between the sand and sedimentary as content while a negative correlation was found between TOM and mud with Arsenic (p<0.01) ( Table 2) and may be related to geology. The geology plays a crucial role in arsenic mitigation [27]. Sediments typically contain only modest levels of arsenic and the cause and timing of arsenic mobilization from these sediments remain unclear.…”

Section: Resultsmentioning

confidence: 99%

“…Sediments typically contain only modest levels of arsenic and the cause and timing of arsenic mobilization from these sediments remain unclear. Vulnerable areas for arsenic contamination are typically young Quaternary deltaic and alluvial sediments [5], with a typically high content of organic matter [27]. Moreover, Berg et al (2007) found a correlation with sediment-bound iron.…”

Section: Resultsmentioning

confidence: 99%

Study of arsenic distribution in sediments of the southeastern Caspian sea

Bagheri

Gharaei

Harami³

et al. 2014

IJBAS

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Geochemical studies of sediments, water bodies like rivers, estuaries and the sea bed, can be an effective step to find the source and distribution model assessment of environmental pollutants in a region. Sediments are the final destination of heavy metals in aqueous environments contamination, including arsenic entering the water resources in different ways, causing hazards such as poisoning, and carcinogenesis in living bodies. Study arsenic levels in the eastern part of the Caspian Sea, 30 stations were selected in the Calculation of aggregated fine-grained organic matter in two seasons of the arsenic concentration in both summer and winter by using Inductively Coupled Plasma -Mass spectrometry (ICP-MS) was determined. Geochemical index, Enrichment factor and pollution index were determined low pollution to nonpollution area and cause of arsenic to the environment, erosion of the Geological formation of the bay, leading GORGAN River carry deposits upstream of surroundings were. Primary cause of arsenic to the environment, geology and upstream sediment erosion and transport by rivers is leading to Gorgan Bay and surrounding areas. Compare these results with other parts of the Caspian Sea show that arsenic levels observed in this study in the Gorgan Bay and surrounding areas has been less than other part of the Caspian Sea.

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Bangladesh and Vietnam: Different Groundwater Compositions Require Different Approaches to Arsenic Mitigation

Abstract: In the large cities, groundwater is treated in central water treatment plants. In rural areas, the water supply is highly decentralized, and more than 12 million tubewells provide THIS IMAGE AND TOC GRAPHIC BY SAMUEL LUZI, EAWAG

Cited by 101 publications

References 23 publications

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

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

Efficient Removal of Arsenic Using Magnetic Multi-Granule Nanoclusters

Study of arsenic distribution in sediments of the southeastern Caspian sea

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