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Related Concept Videos

Coagulation01:06

Coagulation

807
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

Electrodeposition

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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.
Electrodeposition can...
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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Controlled-Current Coulometry: Overview01:27

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Electrolysis03:00

Electrolysis

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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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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

484
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
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Related Experiment Video

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Preparation of Free-Surface Hyperbolic Water Vortices
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Continuous-flow electrocoagulation (EC) process for iron removal from water: Experimental, statistical and economic

B Abdulhadi1, P Kot2, K Hashim1

  • 1Built Environment and Sustainable Technologies (BEST) Research Institute, Liverpool John Moores University, United Kingdom; Department of Environmental Engineering, University of Babylon, Iraq.

The Science of the Total Environment
|November 10, 2020
PubMed
Summary

A novel electrocoagulation (EC) unit design using drilled plates effectively removes 99.9% of iron from water. This innovative design minimizes power consumption and offers a cost-effective solution for water treatment.

Keywords:
Aluminium electrodesElectrocoagulationHeavy metalsWater treatment

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Electrochemistry

Background:

  • Electrocoagulation (EC) is a widely used, cost-effective water treatment method due to its chemical additive-free nature.
  • Existing EC units face limitations, particularly in reactor design, impacting efficiency and power consumption.

Purpose of the Study:

  • To develop and validate a new electrocoagulation (EC) unit design.
  • The new design utilizes drilled plates as electrodes to enhance mixing and reduce external power requirements.
  • To optimize iron removal from water using the novel EC reactor.

Main Methods:

  • A new EC reactor with drilled plate electrodes was designed and implemented for continuous flow treatment.
  • The Box-Behnken model was employed to optimize key operational parameters: applied current density (ACD), pH of water (PoW), initial iron concentration (IC), and treatment time (TT).
  • Synthetic water samples with varying iron concentrations were treated to assess the reactor's performance.

Main Results:

  • The optimized EC process achieved a 99.9% removal of iron from water.
  • Optimal conditions were identified as PoW of 7, ACD of 3 mA/cm², IC of 10 mg/l, and TT of 50 min.
  • The performance of the EC unit was accurately simulated with an R² value of 0.9788.
  • The cost-effectiveness of iron removal using the proposed EC unit was determined to be £0.623/m³.

Conclusions:

  • The developed EC unit with drilled plate electrodes offers an efficient and cost-effective solution for iron removal from water.
  • The novel design successfully addresses limitations of conventional EC units by integrating mixing within the electrode structure, thereby minimizing power consumption.
  • The study demonstrates the potential of this optimized EC system for practical water and wastewater treatment applications.