Arsenic removal with zero-valent iron filters in Burkina Faso: Field and laboratory insights

Nikiema, Julien; Lalanne, Franck; Hoffmann, Lutz; Biswakarma, Jagannath; Siebenaller, Luc; Demange, D.; Schirmer, Mario; Hug, Stephan J.

doi:10.1016/j.scitotenv.2020.139466

Cited by 42 publications

(52 citation statements)

References 51 publications

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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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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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“…Geogenic arsenic in Burkina Faso stems from the oxidation of sulfide minerals (e.g., arsenian pyrite, arsenopyrite) often associated with gold mineralization, and occurs as As(V) under oxic conditions [32,47]. In the context of rural supplies, removing arsenic at the local scale is often the only option to meet the WHO and national acceptance thresholds (10 µg/L) [48]. This hints at the need to develop methods that can be implemented on the ground [48][49][50].…”

Section: Discussionmentioning

confidence: 99%

“…In the context of rural supplies, removing arsenic at the local scale is often the only option to meet the WHO and national acceptance thresholds (10 µg/L) [48]. This hints at the need to develop methods that can be implemented on the ground [48][49][50]. Priority chemical contamination remains a major challenge for the future.…”

Section: Discussionmentioning

confidence: 99%

Mapping Ground Water Access in Two Rural Communes of Burkina Faso

Díaz-Alcaide

Sandwidi

Martínez‐Santos

et al. 2021

Water

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Granting safe water access worldwide is a major objective of the Sustainable Development Goals. Water access is a manifold concept that encompasses collection time, distance from the household, water quality, affordability, and reliability of water sources, among other factors. GIS-based methods can be particularly useful in improving water access estimates, particularly in rural areas of developing countries. Based on an extensive water point database (n = 770), this paper explores the main challenges involved in mapping water access in two rural communes of Burkina Faso. Water access is estimated in terms of coverage per surface area. Coverage is filtered into four distinct categories of improved water sources, namely existing infrastructures, operational infrastructures, permanent infrastructures, and permanent infrastructures that provide safe water. The outcomes suggest that the study area is better endowed with water access than rural Burkina Faso and the remainder of the African continent, although there are important questions regarding groundwater quality. The outcomes highlight the conceptual differences between coverage and access, as well as some of the practical difficulties involved in estimating water access beyond standard ratios. The shortcomings include the absence of continuous monitoring of infrastructure functionality and water quality, as well as water affordability, among others. Enhancing national borehole databases with items aligned with the United Nations’ definition of water access is recommended.

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“…Under oxidizing conditions, H 3 AsO 4 − is the more stable species between pH 2 and 7, whereas H 2 AsO 4 2− is the more stable species above pH 7 in natural waters 26,27 . Several treatment technologies for arsenic removal from drinking water have been applied worldwide, 28 and the most commonly used are chemical coagulation using metal (iron) salts, 29–31 sorption on activated alumina, 32–34 iron oxides and iron oxyhydroxides, 35–40 electrocoagulation with Fe/Al electrodes, 41 preliminary arsenic oxidation by ozonation or biological oxidation, 42 ion exchange using polymer resins 43 and pressure‐driven membrane processes, such as nanofiltration 44 and reverse osmosis 45–47 . Among the several existing arsenic removal technologies, chemical precipitation by ferric coagulation followed by filtration and adsorption onto iron oxides and iron oxyhydroxides appear to be cost effective for large‐scale arsenic treatment plants to comply with established WHO guideline value of 10 μg L −1 35,40,48 .…”

Section: Introductionmentioning

confidence: 99%

Pre‐deposited dynamic membrane adsorber formed of microscale conventional iron oxide‐based adsorbents to remove arsenic from water: application study and mathematical modeling

Usman

Belkasmi

Kastoyiannis

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND This study reports the development of a dynamic membrane (DM) adsorber by pre‐depositing powdered‐sizedfraction of iron oxide‐based adsorptive material on the surface of a microfiltration(MF) membrane. The aim is to use the developed DM adsorber for arsenate (As(V)) remediation from water by a combined mechanism of adsorptive and membrane filtration. The two applied iron oxide‐based adsorptive materials are micro‐sized granular ferric hydroxide and micro‐sized tetravalent manganese feroxyhyte, and are available at affordable price. RESULTS The results show that As(V) removal efficiency strongly depends on the physicochemical properties of the depositing material such as specific surface area, isoelectric point and particle size of the pre‐depositing material. The experimentally determined As(V) removal rates were mathematically modeled using a homogeneous surface diffusion model, which incorporates the equilibrium parameters and mass transport coefficients of the adsorption process. The simulations showed that the mathematical model could describe the As(V) removal rates accurately over a broad range of operating conditions. The results further showed that the longer filtration times with very low normalized As(V) permeate concentration (C/Cf = 0.1, for example) can be prolonged by operating the DM adsorber at the lowermost membrane water flux of 31 L m−2 h−1 and a large amount of pre‐depositing material on the MF membrane surface (Ma = 14 mg cm−2). CONCLUSION The results presented in this study confirm that use of these inexpensive materials (side‐product of granular iron oxide‐based adsorbents) in treating As(V)‐polluted water would enhance the sustainability of the industrial production process of conventional granular adsorbents by utilizing the wastes created during the process of adsorbent production. © 2021 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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Arsenic removal with zero-valent iron filters in Burkina Faso: Field and laboratory insights

Cited by 42 publications

References 51 publications

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

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

Mapping Ground Water Access in Two Rural Communes of Burkina Faso

Pre‐deposited dynamic membrane adsorber formed of microscale conventional iron oxide‐based adsorbents to remove arsenic from water: application study and mathematical modeling

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