A review on decontamination of arsenic-contained water by electrocoagulation: Reactor configurations and operating cost along with removal mechanisms

Kobya, Mehmet; Soltani, Reza Darvishi Cheshmeh; Omwene, Philip Isaac; Khataee, Alireza

doi:10.1016/j.eti.2019.100519

Cited by 127 publications

(30 citation statements)

References 126 publications

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“…Figure 1 represents different methods within the above four remediation methods. Coagulation using ferric chloride followed by microfiltration removes As(III) (after pre-oxidation) and As(V) equally but the method is not suitable for water that has trace amounts of As and it will produce a high amount of As-containing sludge (Kobya et al, 2020;Sarkar et al, 2012). In ionexchange processes, the conventional ion-exchange methods always reduce the As removal capacity with the competition of other anions in water.…”

Section: Overview Of Common Arsenic Removal Methodsmentioning

confidence: 99%

Selective removal of arsenic in water: A critical review

Weerasundara

Bundschuh

2021

Environmental Pollution

127

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Selective removal of arsenic (As) is the key challenge as this not only increases the efficiency of removal of the main As species (neutral As(III) and As(V) hydroxyl-anions) but also allows the reduction of waste significantly as it does not co-remove other solutes. It increase the capacity and lifetime of units, while lowering the cost of the process. A sustainable selective mitigation method should be considered in relation to the economic resources available, the ability of infrastructure to sustain water treatment and the options for reuse and/or safe disposal of treatment residuals. Several methods of selective As removal have been developed, such as precipitation, adsorption and modified iron and ligand exchange. There are two types of mechanisms involved with As removal: Coulombic or ion exchange; and Lewis acid-base interaction. Solution pH is one of the major controlling factors limiting removal efficiency since most of the above-mentioned methods depend on complexation through electrostatic effects. The different features of two different As species make the selective removal process more difficult, especially under natural conditions. Most of the selective As removal methods involve hydrated Fe(III) oxides through Lewis acid-base interaction. Microbiological methods have been studied recently for selective removal of As although there have been only a small number of studies; however, the method shows remarkable results and indicates positive prospects for the future. The biggest challenges in selective removal of As is the presence of phosphate in water which is chemically comparable with As(V).

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Section: Overview Of Common Arsenic Removal Methodsmentioning

confidence: 99%

Selective removal of arsenic in water: A critical review

Weerasundara

Bundschuh

2021

Environmental Pollution

127

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“…As is the 20th abundant component on the Earth's crust. However, As is a toxic metalloid and is remarked as a considerable global groundwater contaminant, affecting certain rivers and deltas in East and South Asia and in South American countries [6]. Based on the Agency for Toxic Substances and Disease Registry list 2017, As is amongst the most hazardous materials that could be poisonous to humans.…”

Section: Introductionmentioning

confidence: 99%

Arsenic Uptake and Accumulation Mechanisms in Rice Species

Abedi

Mojiri

2020

Plants

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Rice consumption is a source of arsenic (As) exposure, which poses serious health risks. In this study, the accumulation of As in rice was studied. Research shows that As accumulation in rice in Taiwan and Bangladesh is higher than that in other countries. In addition, the critical factors influencing the uptake of As into rice crops are defined. Furthermore, determining the feasibility of using effective ways to reduce the accumulation of As in rice was studied. AsV and AsIII are transported to the root through phosphate transporters and nodulin 26-like intrinsic channels. The silicic acid transporter may have a vital role in the entry of methylated As, dimethylarsinic acid (DMA) and monomethylarsonic acid (MMA), into the root. Amongst As species, DMA(V) is particularly mobile in plants and can easily transfer from root to shoot. The OsPTR7 gene has a key role in moving DMA in the xylem or phloem. Soil properties can affect the uptake of As by plants. An increase in organic matter and in the concentrations of sulphur, iron, and manganese reduces the uptake of As by plants. Amongst the agronomic strategies in diminishing the uptake and accumulation of As in rice, using microalgae and bacteria is the most efficient.

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“…Therefore, oxidation of As(III) to As(V) takes place as a pretreatment process in most of the methods used for arsenic removal (Weerasundara et al 2021;Amen et al 2020). Many methods such as coagulation (Bora et al 2016;Pallier et al 2010), electrochemical processes (Goren and Kobya 2021;Kobya et al 2020), ion exchange (Lee et al 2017;Urbano et al 2012), membrane filtration (Nguyen et al 2009;Schmidt et al 2016), and adsorption (Das et al 2020) are used for removing arsenic from water in order to prevent the toxic effect on living forms and adverse effects on human health caused by arsenic in water resources. Among these methods, adsorption has attracted more attention due to its ease of operation, low cost, sustainability, efficiency, low waste generation and low energy requirement (Weerasundara et al 2021;Amen et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Removal of arsenate using graphene oxide-iron modified clinoptilolite-based composites: adsorption kinetic and column study

Baskan

Hadimlioglu²

2021

J Anal Sci Technol

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In this study, graphene oxide (GO), iron modified clinoptilolite (FeZ), and composites of GO-FeZ (GOFeZA and GOFeZB) were synthesized and characterized using SEM, EDS, XRF, FTIR, and pHpzc. The arsenate uptake on composites of GOFeZA and GOFeZB was examined by both kinetic and column studies. The adsorption capacity increases with the increase of the initial arsenate concentration at equilibrium for both composites. At the initial arsenate concentration of 450 μg/L, the arsenate adsorption on GOFeZA and GOFeZB was 557.86 and 554.64 μg/g, respectively. Arsenate adsorption on both composites showed good compatibility with the pseudo second order kinetic model. The adsorption process was explained by the surface complexation or ion exchange and electrostatic attraction between GOFeZA or GOFeZB and arsenate ions in the aqueous solution due to the relatively low equilibrium time and fairly rapid adsorption of arsenate at the beginning of the process. The adsorption mechanism was confirmed by characterization studies performed after arsenate was loaded onto the composites. The fixed-bed column experiments showed that the increasing the flow rate of the arsenate solution through the column resulted in a decrease in empty bed contact time, breakthrough time, and volume of treated water. As a result of the continuous operation column study with regenerated GOFeZA, it was demonstrated that the regenerated GOFeZA has lower breakthrough time and volume of treated water compared to fresh GOFeZA.

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A review on decontamination of arsenic-contained water by electrocoagulation: Reactor configurations and operating cost along with removal mechanisms

Cited by 127 publications

References 126 publications

Selective removal of arsenic in water: A critical review

Selective removal of arsenic in water: A critical review

Arsenic Uptake and Accumulation Mechanisms in Rice Species

Removal of arsenate using graphene oxide-iron modified clinoptilolite-based composites: adsorption kinetic and column study

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