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

Hoyos, Sofia Esperanza Garrido; Flores, Martha Avilés; González, Antonio Ramírez; Fajardo, Celia Grajeda; Zoloeta, Saúl Cardoso; Orozco, Hayron Velásquez

doi:10.3390/w5020834

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…The weak band at 856.0 ± 0.1 cm −1 is supposed to be characteristic of the hydroperoxides bond [21,33]. The peak formed at 929.6 ± 0.1 cm −1 confirms the presence of an aromatic group [27].…”

Section: Characterization Of Acorn Leavesmentioning

confidence: 86%

Use of Acorn Leaves as a Natural Coagulant in a Drinking Water Treatment Plant

Benalia

Derbal

Pánico

et al. 2018

Water

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In this study, the use of acorn leaves as a natural coagulant to reduce raw water turbidity and globally improve drinking water quality was investigated. The raw water was collected from a drinking water treatment plant located in Mila (Algeria) with an initial turbidity of 13.0 ± 0.1 NTU. To obtain acorn leaf powder as a coagulant, the acorn leaves were previously cleaned, washed with tap water, dried, ground and then finely sieved. To improve the coagulant activity and, consequently, the turbidity removal efficiency, the fine powder was also preliminarily treated with different solvents, as follows, in order to extract the coagulant agent: (i) distilled water; (ii) solutions of NaCl (0.25; 0.5 and 1 M); (iii) solutions of NaOH (0.025; 0.05 and 0.1 M); and (iv) solutions of HCl (0.025; 0.05 and 0.1 M). Standard Jar Test assays were conducted to evaluate the performance of the coagulant in the different considered operational conditions. Results of the study indicated that at low turbidity (e.g., 13.0 ± 0.1 NTU), the raw acorn leaf powder and those treated with distilled water (DW) were able to decrease the turbidity to 3.69 ± 0.06 and 1.97 ± 0.03 NTU, respectively. The use of sodium chloride solution (AC-NaCl) at 0.5 M resulted in a high turbidity removal efficiency (91.07%) compared to solutions with different concentrations (0.25 and 1 M). Concerning solutions of sodium hydroxide (AC-NaOH) and hydrogen chloride (AC-HCl), the lowest final turbidities of 1.83 ± 0.13 and 0.92 ± 0.02 NTU were obtained when the concentrations of the solutions were set at 0.05 and 0.1 M, respectively. Finally, in this study, other water quality parameters, such as total alkalinity hardness, pH, electrical conductivity and organic matters content, were measured to assess the coagulant performance on drinking water treatment.

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Section: Characterization Of Acorn Leavesmentioning

confidence: 86%

Use of Acorn Leaves as a Natural Coagulant in a Drinking Water Treatment Plant

Benalia

Derbal

Pánico

et al. 2018

Water

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“…Garrido Hoyos et al [93] applied laboratory tests in order to design a full-scale water plant for As removal from groundwater (As contents up to 0.1671 mg L −1 ) in Mixco Municipality (Guatemala). The flow diagram of the As removal plant designed by Garrido Hoyos et al [93] includes the following processing units: pre-oxidation, regulation of pH, coagulation, flocculation, sedimentation, filtration pressure filters, disinfection, and storage. The best results (96.80%) of As removal from groundwater in Mixco Municipality were obtained for the configuration which uses clinoptilolite filter, resulting in 0.005 mg As L −1 .…”

Section: Removal Of As From Watermentioning

confidence: 99%

The Status of Arsenic Pollution in the Greek and Cyprus Environment: An Overview

Golfínopoulos

Varnavas

Alexakis

2021

Water

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This study presents an overview about the arsenic (As) contamination and its sources in two European countries. Arsenic is a highly toxic element in its inorganic form and it is carcinogenic to human seven in low concentrations. The occurrence of As in surface water, stream and marine waters, groundwater, bottled water, sediment, soil, mines, and seafood, its environmental origin, and its impacts on human health are discussed. The classes of Geoaccumulation Index for As in Greece ranges from practically uncontaminated to extremely contaminated, and in Cyprus varies between practically uncontaminated and heavily contaminated. In many cases, the As contamination reaches very high concentrations and the impacts may be crucial for the human health and ecosystems. Physicochemical properties, regional climate and geological setting are controlling the occurrence and transport of As. In Greece and Cyprus, the geology, lithology, and ore-deposits are the most important factors for the variation of As contents in water, soil, and sediment. The dominant As species are also determined by the location and the redox conditions. The findings of this paper may be useful for scientists and stakeholders monitoring the studied areas and applying measures for protection of the human and terrestrial ecological receptors (plants, avian, mammals).

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“…Various techniques for arsenic removal methods and their technological developments from water and wastewater treatments have been studied such as membrane filtration [4,9], biological processes [10], coagulation-flocculation [11], ion exchange [12,13], and adsorption [14][15][16]. Within these methods, the adsorption has been widely extended as a competitive application for the water and wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Magnetic Xerogel Monolith as an Adsorbent for As(V) Removal from Groundwater

et al. 2021

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Arsenic contamination of groundwater is still a global problem due to the toxicity at low dose on human health confirmed by epidemiological studies. Magnetic xerogel monoliths (MXs) were synthesized by the sol-gel polymerization using resorcinol, formaldehyde, alkaline catalyst and magnetite. The varying molar ratios of magnetite and resorcinol (M/R) in the gel were evaluated for As(V) removal from groundwater. The surface chemistry, structure and morphology of MXs related to arsenic adsorption were characterized by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and point of zero charge. Batch adsorption experiments were carried out to investigate the effects of Fe contents, initial pH and adsorbent dose on As(V) removal performance. The MXs with molar ratio of M/R at 0.15 gave the maximum As(V) adsorption capacity and removal with values of 62.8 µg/g and 86.7%, respectively. The adsorption data were well described by the Elovich equation of the kinetic model and the Freundlich isotherm. The thermodynamic studies demonstrated that the adsorption process was endothermic and spontaneous in nature. MXs showed to be a good alternative for As(V) removal from groundwater and achieving the efficient desorption, and thus fulfilled the Mexican standard for drinking water.

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

Cited by 9 publications

References 15 publications

Use of Acorn Leaves as a Natural Coagulant in a Drinking Water Treatment Plant

Use of Acorn Leaves as a Natural Coagulant in a Drinking Water Treatment Plant

The Status of Arsenic Pollution in the Greek and Cyprus Environment: An Overview

Synthesis and Characterization of Magnetic Xerogel Monolith as an Adsorbent for As(V) Removal from Groundwater

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