Research on the removal of arsenic from drinking water by flocculation with iron solutions and adsorption with granulated iron hydroxide (GEH)

Wingrich, H.; Wolf, Cornelia

doi:10.2166/aqua.2002.0024

Cited by 6 publications

(4 citation statements)

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“…Se is toxic to humans, and acute exposure may lead to severe respiratory problems and neurological effects . In drinking water, for example, the limit is 0.05 ppm in the United States (soon to be lowered to 0.01 ppm) and 0.01 ppm in Europe and Japan. , Relatively high concentrations of As have been reported both in power-plant discharges and in freshwater supplies. Inorganic As may be present in the 3+ (As(III), arsenite) and 5+ (As(V), arsenate) oxidation states …”

Section: Introductionmentioning

confidence: 99%

Removal of Trace Levels of Arsenic and Selenium from Aqueous Solutions by Calcined and Uncalcined Layered Double Hydroxides (LDH)

Shahrivari

Liu

et al. 2005

Ind. Eng. Chem. Res.

267

208

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The adsorption of As and Se from dilute aqueous solutions, representing model power-plant effluent streams, by calcined and uncalcined layered double hydroxide (LDH) adsorbents has been investigated. The results indicate that As(V) has a greater adsorption capacity than Se(IV) for both calcined and uncalcined LDHs. An mth-order kinetic rate equation describes the adsorption kinetics of As and Se on these adsorbents. The adsorption isotherms obey the Freundlich model. The adsorption capacities of As(V) and Se(IV) on the calcined LDH are higher than those on the uncalcined LDH. The starting solution pH does not significantly influence adsorption of As and Se on calcined LDH, as long as it is higher than 4; As and Se adsorption on uncalcined LDH is, however, more sensitive to variations in the initial pH. Studies of the effect of the metal oxidation state on adsorption reveal that As(III) is more difficult to remove than As(V) by both the calcined and uncalcined LDHs. However, the adsorption of Se(IV) and Se(VI) is relatively similar on both calcined and uncalcined LDHs. Competing ions have a greater effect on Se(IV) uptake than on As(V) uptake. Desorption of As(V) and Se(IV) from the LDH depends on the type of ion species and their concentration in the desorbing solutions.

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Section: Introductionmentioning

confidence: 99%

Removal of Trace Levels of Arsenic and Selenium from Aqueous Solutions by Calcined and Uncalcined Layered Double Hydroxides (LDH)

Shahrivari

Liu

et al. 2005

Ind. Eng. Chem. Res.

267

208

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“…The adsorption amount of GFH for As(V) is higher than that of AA (Wingrich and Wolf 2002;Thirunavukkarasu et al 2003). At an initial As(V) concentration of 29 mg/L and pH 7, approximately 18.8 mg/g As was adsorbed on the surface of the iron-coated alumina adsorbent prepared by in situ precipitation of iron hydroxide on the surface of AA (Hlavay and Polyák 2005).…”

Section: Batch Experimentsmentioning

confidence: 94%

Removal of arsenate from water by adsorbents: a comparative case study

Bang

Peña

Patel

et al. 2010

Environ Geochem Health

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Laboratory and field filtration experiments were conducted to study the effectiveness of As(V) removal for five types of adsorbent media. The media included activated alumina (AA), modified activated alumina (MAA), granular ferric hydroxide (GFH), granular ferric oxide (GFO), and granular titanium dioxide (TiO₂). In laboratory batch and column experiments, the synthetic challenge water was used to evaluate the effectiveness for five adsorbents. The results of the batch experiments showed that the As(V) adsorption decreased as follows at pH 6.5: TiO₂ > GFO > GFH > MAA > AA. At pH 8.5, however, As(V) removal decreased in the following order: GFO = TiO₂ > GFH > MAA > AA. In column experiments, at pH 6.5, the adsorbed As(V) for adsorbents followed the order: TiO₂ > GFO > GFH, whereas at pH 8.5 the order became: GFO = TiO₂ > GFH when the challenge water containing 50 μg/L of As(V) was used. Field filtration experiments were carried out in parallel at a wellhead in New Jersey. Before the effluent arsenic concentration increased to 10 μg/L, approximately 58,000 and 41,500 bed volumes of groundwater containing an average of 47 μg/L of As(V) were treated by the filter system packed with GFO and TiO₂, respectively. The As(V) adsorption decreased in the following sequence: GFO > TiO₂ > GFH > MAA > AA. Filtration results demonstrated that GFO and TiO₂ adsorbents could be used as media in small community filtration systems for As(V) removal.

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“…Bulk liquid-phase samples were taken at the sample port (see Figure 2)-where 10 mL of water was drained into new 50 mL polypropylene sampling tubes. Liquid samples were taken at 4,8,10,15,16,17,18,19,20,22,45,76,138,199,255,333,387,439,1447,3013,4340 and 8636 minutes after the injection.…”

Section: Arsenate Experimentsmentioning

confidence: 99%

“…The sodium arsenite injection was performed in the same way as the sodium arsenate injection. Bulk aqueous samples were taken at times 0 (immediately prior to injection), 4,7,8,9,10,11,13,15,17,19,30,60,120,180,240, 300, 360, 420, 1440, 2880, 4320, 5760, 10080, 14400, 20160 and 30240 minutes. Coupons were removed at 1.33, 10.25, 22.5, 39.75, 72.…”

Section: Arsenite Experimentsmentioning

confidence: 99%

Modeling fate and transport of arsenic in a chlorinated distribution system

Burkhardt

Szabo

Klosterman

et al. 2017

Environmental Modelling & Software

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Experimental and modeling studies were conducted to understand the fate and transport properties of arsenic in drinking water distribution systems. Pilot scale experiments were performed in a distribution system simulator by injecting arsenic and measuring both adsorption onto iron pipe material and the oxidation of arsenite by hypochlorite in tap water to form arsenate. A mathematical model describing these processes was developed and simulated using EPANET-MSX, a hydraulic and multi-species water quality software for pipe networks. Model parameters were derived from the pilot-scale experiments. The model was applied to both the distribution system simulator and EPANET example network #3, a real-world model of a drinking water system serving approximately 78,000 customers. The model can be applied to systems-level studies of arsenic fate and transport in drinking water resulting from natural occurrences, accidental spills, or intentional introduction into water.

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Research on the removal of arsenic from drinking water by flocculation with iron solutions and adsorption with granulated iron hydroxide (GEH)

Cited by 6 publications

References 0 publications

Removal of Trace Levels of Arsenic and Selenium from Aqueous Solutions by Calcined and Uncalcined Layered Double Hydroxides (LDH)

Removal of Trace Levels of Arsenic and Selenium from Aqueous Solutions by Calcined and Uncalcined Layered Double Hydroxides (LDH)

Removal of arsenate from water by adsorbents: a comparative case study

Modeling fate and transport of arsenic in a chlorinated distribution system

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