Arsenic removal by coagulation

Scott, Karen N.; Green, James F.; Hoang, Dung Van; McLean, Stephen J.

doi:10.1002/j.1551-8833.1995.tb06347.x

Cited by 111 publications

(49 citation statements)

References 13 publications

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“…For As(V), the increase in ionic strength from 0.001 to 0.1 M leads to a shift in the position of the pH edge toward the alkaline region (Fig. 4a), and slightly enhances adsorption in this range (7)(8)(9)(10). These behaviors are indicative of an inner-sphere adsorption mechanism for As(V) on the Fe-Zr binary oxide.…”

Section: Effect Of Ph and Ionic Strengthmentioning

confidence: 91%

“…As(III) is much more toxic [5], soluble, and mobile than As(V). A variety of treatment processes such as coagulation/precipitation [6,7], ion-exchange [8], adsorption [4,9,10], and membrane processes [8,11] have been employed to remove arsenic. Adsorption methods are considered to be the most promising technologies because the system can be simple to operate and cost-effective [10].…”

Section: Introductionmentioning

confidence: 99%

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Adsorptive removal of arsenic from water by an iron–zirconium binary oxide adsorbent

Ren

Zhang

Chen

2011

Journal of Colloid and Interface Science

257

100

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a b s t r a c tArsenate and arsenite may exist simultaneously in groundwater and have led to a greater risk to human health. In this study, an iron-zirconium (Fe-Zr) binary oxide adsorbent for both arsenate and arsenite removal was prepared by a coprecipitation method. The adsorbent was amorphous with a specific surface area of 339 m 2 /g. It was effective for both As(V) and As(III) removal; the maximum adsorption capacities were 46.1 and 120.0 mg/g at pH 7.0, respectively, much higher than for many reported adsorbents. Both As(V) and As(III) adsorption occurred rapidly and achieved equilibrium within 25 h, which were well fitted by the pseudo-second-order equation. Competitive anions hindered the sorption according to the sequence PO 4 . The ionic strength effect experiment, measurement of zeta potential, and FTIR study indicate that As(V) forms inner-sphere surface complexes, while As(III) forms both inner-and outer-sphere surface complexes at the water/Fe-Zr binary oxide interface. The high uptake capability and good stability of the Fe-Zr binary oxide make it a potentially attractive adsorbent for the removal of both As(V) and As(III) from water.

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Section: Effect Of Ph and Ionic Strengthmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Adsorptive removal of arsenic from water by an iron–zirconium binary oxide adsorbent

Ren

Zhang

Chen

2011

Journal of Colloid and Interface Science

257

100

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“…For arsenite, the uncharged H 3 AsO 3 dominates at pH lower than 9.0 under reducing conditions (Yan et al, 2000;Smedley and Kinniburgh, 2002). Various treatment techniques such as coagulation/precipitation (Scott et al, 1995), ion-exchange (Kartinen and Martin, 1995), sorption (Jang et al, 2006;Zhang et al, 2007a) and membrane processes (Kartinen and Martin, 1995;Waypa et al, 1997) have been developed and employed for arsenic removal. Due to its simplicity, high efficiency and cost-effectiveness, sorption processes are regarded as the most promising methods and largely used for arsenic removal from water and wastewater (Jang et al, 2006;.Sharma and Sohn, 2009).…”

Section: Introductionmentioning

confidence: 99%

Nanostructured iron(III)-copper(II) binary oxide: A novel adsorbent for enhanced arsenic removal from aqueous solutions

et al. 2013

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Arsenate Arsenite Regeneration a b s t r a c tTo obtain a highly efficient and low-cost adsorbent for arsenic removal from water, a novel nanostructured FeeCu binary oxide was synthesized via a facile co-precipitation method.Various techniques including BET surface area measurement, powder XRD, SEM, and XPS were used to characterize the synthetic FeeCu binary oxide. It showed that the oxide was poorly crystalline, 2-line ferrihydrite-like and was aggregated with many nanosized particles. Laboratory experiments were performed to investigate adsorption kinetics, adsorption isotherms, pH adsorption edge and regeneration of spent adsorbent. The results indicated that the FeeCu binary oxide with a Cu: Fe molar ratio of 1:2 had excellent performance in removing both As(V) and As(III) from water, and the maximal adsorption capacities for As(V) and As(III) were 82.7 and 122.3 mg/g at pH 7.0, respectively. The values are favorable, compared to those reported in the literature using other adsorbents. The coexisting sulfate and carbonate had no significant effect on arsenic removal. However, the presence of phosphate obviously inhibited the arsenic removal, especially at high concentrations. Moreover, the FeeCu binary oxide could be readily regenerated using NaOH solution and be repeatedly used. The FeeCu binary oxide could be a promising adsorbent for both As(V) and As(III) removal because of its excellent performance, facile and low-cost synthesis process, and easy regeneration. ª 2013 Elsevier Ltd. All rights reserved. IntroductionArsenic, a ubiquitous element found in the environment, is well-known and extensively concerned with high toxicity and carcinogenicity. It is introduced into the water and groundwater through a combination of natural processes such as weathering reactions, dissolution of minerals and biological activity as well as through anthropogenic activities such as mining, agriculture and manufacturing (Cullen and Reimer, 1989;Smedley and Kinniburgh, 2002 Available online at www.sciencedirect.com journal homepage: www.elsevier.com/locate /wa tres w a t e r r e s e a r c h 4 7 ( 2 0 1 3 ) 4 0 2 2 e4 0 3 1 0043-1354/$ e see front matter ª

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“…Figure 5 shows the effect of the dosage of ferric chloride on arsenic removal, with an initial arsenic concentration of 0.11-0.120 mg·L Previous studies have shown that the percentage of arsenic removed using alum and ferric chloride coagulation is independent of initial arsenic (V) concentration for a wide range of conditions. Scott [25] showed nearly constant arsenic removal percentages, 82%-96%, when using 3-10 mg·L …”

Section: Optimum Dosementioning

confidence: 95%

Comparing Two Operating Configurations in a Full-Scale Arsenic Removal Plant. Case Study: Guatemala

Hoyos

Flores

González

et al. 2013

Water

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The present study was conducted in Naranjo County located in the municipality of Mixco, Guatemala. The water supply source comes from two wells with a maximum flow of 25.24 and 33.44 L·s . The aim of this study was to conduct laboratory tests, basic engineering and supervision of the construction and evaluation of an operations plant using two configurations, A (low-rate sedimentation and ceramic filter) and B (high-rate sedimentation and clinoptilolite filter), to remove arsenic present in water for human use and consumption. This plant supplies water to Naranjo County in Mixco, Guatemala (5000 inhabitants). First, a laboratory Jar Test was performed to evaluate arsenic removal efficiency. And second, a conventional clarification plant was then built (design flow: 25.24 L·s ) for arsenic, values that comply with Guatemalan standards. For this case, the relation between Fe(III) dosage/mg and As(V) removal was 1:46.

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Arsenic removal by coagulation

Cited by 111 publications

References 13 publications

Adsorptive removal of arsenic from water by an iron–zirconium binary oxide adsorbent

Adsorptive removal of arsenic from water by an iron–zirconium binary oxide adsorbent

Nanostructured iron(III)-copper(II) binary oxide: A novel adsorbent for enhanced arsenic removal from aqueous solutions

Comparing Two Operating Configurations in a Full-Scale Arsenic Removal Plant. Case Study: Guatemala

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