Arsenic in drinking water wells on the Bolivian high plain: Field monitoring and effect of salinity on removal efficiency of iron-oxides-containing filters

Bergh, K. Van Den; Laing, Gijs Du; Montoya, Juan Carlos; Deckere, Eric de; Tack, Filip

doi:10.1080/10934529.2010.513262

Cited by 25 publications

(6 citation statements)

References 22 publications

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“…In the South American continent, >1 cm/year subsidence has been mapped over small, irrigated regions in Argentina and Peru. In Bolivia, >5 cm/year subsidence has been predicted over groundwater dependent cities 44 , 45 of Oruro and Cochabamba.…”

Section: Resultsmentioning

confidence: 99%

Global land subsidence mapping reveals widespread loss of aquifer storage capacity

Hasan,

Smith,

Vajedian

et al. 2023

Nat Commun

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Groundwater overdraft gives rise to multiple adverse impacts including land subsidence and permanent groundwater storage loss. Existing methods are unable to characterize groundwater storage loss at the global scale with sufficient resolution to be relevant for local studies. Here we explore the interrelation between groundwater stress, aquifer depletion, and land subsidence using remote sensing and model-based datasets with a machine learning approach. The developed model predicts global land subsidence magnitude at high spatial resolution (~2 km), provides a first-order estimate of aquifer storage loss due to consolidation of ~17 km3/year globally, and quantifies key drivers of subsidence. Roughly 73% of the mapped subsidence occurs over cropland and urban areas, highlighting the need for sustainable groundwater management practices over these areas. The results of this study aid in assessing the spatial extents of subsidence in known subsiding areas, and in locating unknown groundwater stressed regions.

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Section: Resultsmentioning

confidence: 99%

Global land subsidence mapping reveals widespread loss of aquifer storage capacity

Hasan,

Smith,

Vajedian

et al. 2023

Nat Commun

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“…The second step in the process is the interaction between HFO and the As species. Arsenic adsorption on iron oxide phases varies with pH, As speciation, initial As concentration, and As/Fe ratio. − Numerous studies have demonstrated the robustness and greater ease of As(V) removal (relative to As(III)) by iron oxide adsorption under a wide range of conditions and solution pH. − For this reason, we have focused our preliminary investigation of pH dependence of our system on the As(III) species; our findings are discussed when the Jar test experiments are presented.…”

Section: Resultsmentioning

confidence: 99%

Combining Ferric Salt and Cactus Mucilage for Arsenic Removal from Water

Fox

Stebbins

Alcantar

2016

Environ. Sci. Technol.

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New methods to remediate arsenic-contaminated water continue to be studied, particularly to fill the need for accessible methods that can significantly impact developing communities. A combination of cactus mucilage and ferric (Fe(III)) salt was investigated as a flocculation-coagulation system to remove arsenic (As) from water. As(V) solutions, ferric nitrate, and mucilage suspensions were mixed and left to stand for various periods of time. Visual and SEM observations confirmed the flocculation action of the mucilage as visible flocs formed and settled to the bottom of the tubes within 3 min. The colloidal suspensions without mucilage were stable for up to 1 week. Sample aliquots were tested for dissolved and total arsenic by ICP-MS and HGAFS. Mucilage treatment improved As removal (over Fe(III)-only treatment); the system removed 75-96% As in 30 min. At neutral pH, removal was dependent on Fe(III) and mucilage concentration and the age of the Fe(III) solution. The process is fast, achieving maximum removal in 30 min, with the majority of As removed in 10-15 min. Standard jar tests with 1000 μg/L As(III) showed that arsenic removal and settling rates were pH-dependent; As removal was between 52% (high pH) and 66% (low pH).

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“…Considering this, some researchers have applied commercial iron-nails in different water/ wastewater treatments e.g. in sand filters during the filtration process for arsenic removal [38][39][40][41], in Electrocoagulation process for removal of mercury (II) [42], and in ultrasound-assisted Fenton process for wastewater treatment [43]. However, the application of commercial iron-nails for NOM removal in the drinking water treatment plants has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Fenton pre-oxidation of natural organic matter in drinking water treatment through the application of iron nails

Santos

Teixeira

Zhou

et al. 2021

Environmental Technology

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This study investigated for the first time the efficiency of an advanced oxidation process (AOP) zero valent iron/hydrogen peroxide (ZVI/H 2 O 2 ) employing iron nails for the removal of Natural Organic Matter (NOM) from natural water of Regent's Park lake, London, UK. The low cost of nails and their easy separation from the water after the treatment make this AOP attractive for water utilities in low-and middle-income countries. The process was investigated as a pre-oxidation step for drinking water treatment. Results showed that UV254 removal in the natural water was lower than that of simulated water containing commercial humic acid (HA), indicating a matrix effect. Statistical analysis confirmed the maximum removal of dissolved organic carbon (DOC) in natural water depends on the initial pH (best at 4.5) and H 2 O 2 dosage (best at 100% excess of stoichiometric dosage). DOC and UV254 removals under this operational condition were 51% and 89%, respectively. Molecular weight (MW) and specific UV absorbance (SUVA254) were significantly reduced to 74% and 78%, respectively. Formation of Chloroform THM in natural water sample after the ZVI/H 2 O 2 process (initial pH 4.5) was below the limit for drinking water, and 48% less than the THM formation in the same water not subjected to pre-oxidation. Characterization of oxidation products on the iron-nail-ZVI surface after the ZVI/H 2 O 2 treatment by SEM, XRD, and XPS identified the formation of magnetite and lepidocrocite. Results suggest that the investigated ZVI/H 2 O 2 process is a promising technology for removing NOM and reducing THM formation during drinking water treatment.

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Arsenic in drinking water wells on the Bolivian high plain: Field monitoring and effect of salinity on removal efficiency of iron-oxides-containing filters

Cited by 25 publications

References 22 publications

Global land subsidence mapping reveals widespread loss of aquifer storage capacity

Global land subsidence mapping reveals widespread loss of aquifer storage capacity

Combining Ferric Salt and Cactus Mucilage for Arsenic Removal from Water

Fenton pre-oxidation of natural organic matter in drinking water treatment through the application of iron nails

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