Arsenic attenuation by oxidized aquifer sediments in Bangladesh

Stollenwerk, Kenneth G.; Breit, George N.; Welch, Alan H.; Yount, James C.; Whitney, John W.; Foster, Andrea L.; Uddin, Md. Nehal; Majumder, Ratan Kumar; Ahmed, N.

doi:10.1016/j.scitotenv.2006.11.029

Cited by 215 publications

(187 citation statements)

References 53 publications

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“…Evidence of these changes is seen in the abundance of ferric (hydr)oxides that give Pleistocene sands in Bangladesh their oft-noted brown or orange color (8,10,13,29,30). These oxidized deposits have a higher capacity for arsenic adsorption (4,21,31) and are associated with aquifers that are low in dissolved arsenic, which are found at greater depths in the Bengal Basin owing to higher sedimentation rates. In contrast to the Pleistocene in the Mekong Delta region, temperatures during the Pliocene-Miocene epochs were likely similar or elevated relative to the Holocene (27,32), suggesting biogeochemical conditions may also have been like those responsible for mobilizing arsenic in shallow clay today.…”

Section: Resultsmentioning

confidence: 99%

Release of arsenic to deep groundwater in the Mekong Delta, Vietnam, linked to pumping-induced land subsidence

Erban¹,

Gorelick²,

Zebker

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

236

134

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Deep aquifers in South and Southeast Asia are increasingly exploited as presumed sources of pathogen- and arsenic-free water, although little is known of the processes that may compromise their long-term viability. We analyze a large area (>1,000 km 2 ) of the Mekong Delta, Vietnam, in which arsenic is found pervasively in deep, Pliocene–Miocene-age aquifers, where nearly 900 wells at depths of 200–500 m are contaminated. There, intensive groundwater extraction is causing land subsidence of up to 3 cm/y as measured using satellite-based radar images from 2007 to 2010 and consistent with transient 3D aquifer simulations showing similar subsidence rates and total subsidence of up to 27 cm since 1988. We propose a previously unrecognized mechanism in which deep groundwater extraction is causing interbedded clays to compact and expel water containing dissolved arsenic or arsenic-mobilizing solutes (e.g., dissolved organic carbon and competing ions) to deep aquifers over decades. The implication for the broader Mekong Delta region, and potentially others like it across Asia, is that deep, untreated groundwater will not necessarily remain a safe source of drinking water.

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Section: Resultsmentioning

confidence: 99%

Release of arsenic to deep groundwater in the Mekong Delta, Vietnam, linked to pumping-induced land subsidence

Erban¹,

Gorelick²,

Zebker

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

236

134

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“…Although no such correlation has been observed between As and bicarbonate concentration, high As groundwater usually contains relatively elevated concentrations of bicarbonate in the Chianan Plain aquifer. This may result in desorption of As oxyanions under the competitive sorption effect of elevated concentrations of bicarbonate [31].…”

Section: Discussionmentioning

confidence: 99%

Hydrogeochemistry of Groundwater and Arsenic Adsorption Characteristics of Subsurface Sediments in an Alluvial Plain, SW Taiwan

et al. 2016

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Many studies were conducted to investigate arsenic mobilization in different alluvial plains worldwide. However, due to the unique endemic disease associated with arsenic (As) contamination in Taiwan, a recent research was re-initiated to understand the transport behavior of arsenic in a localized alluvial plain. A comprehensive approach towards arsenic mobility, binding, and chemical speciation was applied to correlate groundwater hydrogeochemistry with parameters of the sediments that affected the As fate and transport. The groundwater belongs to a Na-Ca-HCO 3 type with moderate reducing to oxidizing conditions (redox potential = −192 to 8 mV). Groundwater As concentration in the region ranged from 8.89 to 1131 µg/L with a mean of 343 ± 297 µg/L, while the As content in the core sediments varied from 0.80 to 22.8 mg/kg with a mean of 9.9 ± 6.2 mg/kg. A significant correlation was found between As and Fe, Mn, or organic matter, as well as other elements such as Ni, Cu, Zn, and Co in the core sediments. Sequential extraction analysis indicated that the organic matter and Fe/Mn oxyhydroxides were the major binding pools of As. Batch adsorption experiments showed that the sediments had slightly higher affinity for As(III) than for As(V) under near neutral pH conditions and the As adsorption capacity increased as the contents of Fe oxyhydroxides as well as the organic matter increased.

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“…7H 2 O) in Milli-Q water and then the pH was adjusted to 7 by using sodium hydroxide (NaOH) reagent. Several studies identified that the organic matter contamination in groundwater of the shallow reducing aquifer is frequently combined with high concentrations of nitrogen and phosphorus (Bhattacharya, et al, 2001, Stollenwerk, et al, 2007. The source of this contamination was suspected to be the wastewater from pit latrines as well as the grey water, which was highly biodegradable.…”

Section: Field Studymentioning

confidence: 99%

“…All these constituents are potentially important factors influencing the arsenic removal efficiency, depending on their mutual interactions in the aquatic environments of treatment units. Many researchers have focused on the quantitative influence of several inorganic competing ions for the removal of arsenic from groundwater (Meng, et al, 2001, Stollenwerk, et al, 2007. However, the harmful consequence of arsenic mobility due to the organic contamination in the AIRU treatment process is still unrecognized and needs to be investigated properly to ensure effective remediation strategies.…”

Section: Introductionmentioning

confidence: 99%

Leaching of arsenic in response to organic matter contamination in groundwater treatment practice

Hassan

Fukushi

Nakajima

et al. 2009

J. of Wat. & Envir. Tech.

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A large number of drinking water treatment units have been installed in many regions adopting the technique of arsenic removal through adsorption and co-precipitation with the naturally occurring iron in groundwater and subsequent sand filtration. This study revealed the consequence of the organic matter inclusion on the arsenic treatment process for drinking water. Laboratory investigation confirmed that the organic contamination in the treatment process impeded the arsenic removal efficiency depending on the types and concentrations of the organic matters. The impact of organic matter contamination on the arsenic removal efficiency was almost immediate and the autoclaved examination showed similar results. Nevertheless, the bioleaching of arsenic, 93 μg/L, from the accumulated sludge in the filter bed was observed under the inoperative condition, for 7 days, of the treatment unit. However, in the control observation (using organic matter plus antibiotic) the effluent arsenic concentration was found to be less than 30 μg/L. The effluent iron concentration in the bioleaching process was not worth mentioning and found to be less than 0.22 mg/L. In this study, the chemical and biological consequences of the organic matter contamination on the arsenic removal practice is elucidated, which might contribute in designing safe options for drinking water.

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Arsenic attenuation by oxidized aquifer sediments in Bangladesh

Cited by 215 publications

References 53 publications

Release of arsenic to deep groundwater in the Mekong Delta, Vietnam, linked to pumping-induced land subsidence

Release of arsenic to deep groundwater in the Mekong Delta, Vietnam, linked to pumping-induced land subsidence

Hydrogeochemistry of Groundwater and Arsenic Adsorption Characteristics of Subsurface Sediments in an Alluvial Plain, SW Taiwan

Leaching of arsenic in response to organic matter contamination in groundwater treatment practice

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