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Related Concept Videos

Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Electrodeposition01:08

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Embedding Fe(0) electrocoagulation in a biologically active As(III) oxidising filter bed.

Mrinal Roy1, Erik Kraaijeveld1, Jink C J Gude2

  • 1Water Management Department, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628CN Delft, the Netherlands.

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|February 8, 2024
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Summary

This study presents a novel method for removing arsenic from groundwater by embedding iron electrocoagulation (FeEC) systems within sand filters. This integrated approach efficiently removes both arsenite and arsenate, offering a cost-effective solution for arsenic contamination.

Keywords:
ArsenicDrinking waterGroundwaterIron electrocoagulation

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Inorganic Chemistry

Background:

  • Groundwater arsenic contamination poses significant health risks, including cancer.
  • Conventional arsenic removal methods often require chemical oxidants and multiple treatment steps.
  • Biological oxidation of arsenite (As(III)) to arsenate (As(V)) in sand filters is effective but requires subsequent As(V) removal.

Purpose of the Study:

  • To develop and evaluate an integrated system for simultaneous biological oxidation and electrochemical removal of arsenic from groundwater.
  • To assess the performance of an embedded iron electrocoagulation (FeEC) system within a biological sand filter for arsenic removal.
  • To compare the efficiency and energy consumption of the embedded FeEC system with conventional methods.

Main Methods:

  • Embedding an iron electrocoagulation (FeEC) system within a sand filter bed for biological arsenic oxidation and removal.
  • Operating the FeEC system within the sand matrix and in the filter supernatant for comparative analysis.
  • Evaluating arsenic removal efficiency (As(III) and As(V)) and energy consumption under different operational conditions.

Main Results:

  • The embedded FeEC system achieved 81% removal of As(III), outperforming FeEC in the supernatant (67%).
  • Comparable removal efficiencies were observed for As(III) and As(V) when FeEC was embedded in the sand filter.
  • Energy consumption was higher in the sand matrix (14 Wh/m³) compared to the supernatant (7 Wh/m³), but efficiency increased with deep-bed infiltration of precipitates.

Conclusions:

  • Embedding FeEC systems in sand filters is a feasible and effective approach for groundwater arsenic removal.
  • This integrated system capitalizes on biological oxidation and electrochemical removal within a single unit, eliminating the need for chemical oxidants.
  • The novel approach offers a cost-effective and simplified solution for treating arsenic-contaminated groundwater.