Electrocoagulation as a remediation tool for wastewaters containing arsenic

Hansen, Henrik K.; Núñez, Patricio; Grandon, Rodrigo

doi:10.1016/j.mineng.2005.09.048

Cited by 94 publications

(53 citation statements)

References 4 publications

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“…It is preferable to avoid this acid addition. At the Universidad Técnica Federico Santa Maria, environmental remediation processes have been investigated specially the use of electroremediation of soil and mine tailings (Hansen et al, 2005) and treatment of arsenic containing wastewaters (Hansen et al, 2006). Especially in wastewater treatment the electrochemical processes have shown their potential in particularly the precipitation of heavy metals and arsenic.…”

Section: )mentioning

confidence: 99%

“…Different process designs were tested, such as a turbulent flow reactor, a combined electrocoagulation and sedimentation basin, and an airlift reactor. It was found (Hansen et al, 2006) analysing preliminarily the electrocoagulation process in a modified flow sedimentation basin that a removal of 98 % from a 100 ppm As solution was possible using iron electrodes. Here it was also showed that introduction of air was necessary to assure oxidation of dissolved iron.…”

Section: Third Stage: Electrocoagulation Of Arsenicmentioning

confidence: 99%

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A new process for sustainable wastewater treatment in Chilean copper smelters

2015

EJSD

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An actual Chilean copper smelter wastewater treatment is a complex process that actually mostly is focused on fulfillment of threshold values more than sustainability. The actual wastewater treatment includes a number of precipitation, neutralization, clarifying and filtering steps. This manuscript proposes a new sustainable process that would eliminate/reduce several of the disadvantages in an actual copper wastewater treatment such as a) reduced lime addition, b) a separate gypsum and heavy metal/arsenic precipitation, c) an electrodialysis stage that would recover copper, d) an easier ferric ion dosage for arsenic removal by electrocoagulation, and e) a less reagent consuming neutralization step.

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Section: )mentioning

confidence: 99%

Section: Third Stage: Electrocoagulation Of Arsenicmentioning

confidence: 99%

A new process for sustainable wastewater treatment in Chilean copper smelters

2015

EJSD

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“…Much of the focus has been on removing high levels of arsenic (1-1000 mg/L) from wastewater, usually at low pH (Balasubramanian & Madhavan, 2001;Pinisakul et al, 2002;Mishra, 2006;Hansen et al, 2006;Gomes et al, 2007). Fewer studies have looked at arsenic removal in potable water at neutral pH (Parga et al, 2005a;Kumar et al, 2004;Gomes et al, 2007;Arienzo et al, 2002).…”

Section: Previous Electrocoagulation Researchmentioning

confidence: 99%

Electrochemical arsenic remediation for rural Bangladesh

Addy¹

2008

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Professor Ashok Gadgil, Co-Chair Professor Robert Jacobsen, Co-Chair Arsenic in drinking water is a major public health problem threatening the lives of over 140 million people worldwide. In Bangladesh alone, up to 57 million people drink arsenic-laden water from shallow wells. ElectroChemical Arsenic Remediation (ECAR) overcomes many of the obstacles that plague current technologies and can be used affordably and on a small-scale, allowing for rapid dissemination into Bangladesh to address this arsenic crisis.In this work, ECAR was shown to effectively reduce 550 -580 µg/L arsenic (including both As [III] and As[V] in a 1:1 ratio) to below the WHO recommended maximum limit of 10 µg/L in synthetic Bangladesh groundwater containing relevant concentrations of competitive ions such as phosphate, silicate, and bicarbonate. Arsenic removal capacity was found to be approximately constant within certain ranges of current density, but was found to change substantially between ranges. In order of decreasing arsenic 2 removal capacity, the pattern was: 0.02 mA/cm 2 > 0.07 mA/cm 2 > 0.30 -1.1 mA/cm 2 > 5.0 -100 mA/cm 2 . Current processing time was found to effect arsenic removal capacity independent of either charge density or current density. Electrode polarization studies showed no passivation of the electrode in the tested range (up to current density 10 mA/cm 2 ) and ruled out oxygen evolution as the cause of decreasing removal capacity with current density. Simple settling and decantation required approximately 3 days to achieve arsenic removal comparable to filtration with a 0.1 µm membrane.X-ray Absorption Spectroscopy (XAS) showed that (1) there is no significant difference in the arsenic removal mechanism of ECAR during operation at different current densities and (2) the arsenic removal mechanism in ECAR is consistent with arsenate adsorption onto a homogenous Fe(III)oxyhydroxide similar in structure to 2-line ferrihydrite.ECAR effectively reduced high arsenic concentrations (100 -500 µg/L) in real Bangladesh tube well water collected from three regions to below the WHO limit of 10 µg/L. Prototype fabrication and field testing are currently underway.

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“…The treatment techniques include methodologies such as oxidation, precipitation and co-precipitation 12,13 , inverse osmosis 14 , and ion exchange 15 . These techniques employ solid adsorbents particles for immobilizing the As ions such as alumina, mineral oxides, active carbon, polymer resins and zeolites 16 .…”

Section: Introductionmentioning

confidence: 99%

Study of the Adsorption of Arsenic (III and V) by Magnetite Nanoparticles Synthetized via AACVD

et al. 2016

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Globally, water pollution is mainly caused by the presence of heavy metals and metalloids such as arsenic. The majority of the techniques employed in the removal are of low efficiency and high cost. Therefore, in this work it is presented the adsorption processes of arsenic (As III and V) ions employing magnetite nanoparticles (MNPs) synthesized by the aerosol assisted chemical vapor deposition (AACVD) process. The adsorption efficiency was determined at different times and concentrations. The remaining As concentration in the solutions was analyzed by atomic absorption spectroscopy. The adsorbed As ions on the surface of the NMPs was analyzed by high resolution transmission electron microscopy. The results showed an overall removal efficiency of 87% for As +3 and 98% for As +5, in a contact time of 15 minutes. Results suggested the use of NMPs as a promising alternative in the removal of As ions in water.

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Electrocoagulation as a remediation tool for wastewaters containing arsenic

Cited by 94 publications

References 4 publications

A new process for sustainable wastewater treatment in Chilean copper smelters

A new process for sustainable wastewater treatment in Chilean copper smelters

Electrochemical arsenic remediation for rural Bangladesh

Study of the Adsorption of Arsenic (III and V) by Magnetite Nanoparticles Synthetized via AACVD

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