Related Experiment Video
Updated: Nov 29, 2025
08:01
Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
Published on: June 28, 2019
7.7K
Arsenic and fluoride removal by electrocoagulation process: A general review
Miguel A Sandoval1, Rosalba Fuentes2, Abdoulaye Thiam3
1Universidad de Santiago de Chile USACH, Facultad de Química y Biología, Departamento de Química de los Materiales, Laboratorio de Electroquímica Medio Ambiental, LEQMA, Casilla 40, Correo 33, Santiago, Chile; Universidad de Guanajuato, División de Ciencias Naturales y Exactas, Departamento de Ingeniería Química, Noria Alta S/N, 36050, Guanajuato, Guanajuato, Mexico.
The Science of the Total Environment
|November 19, 2020
Summary
Electrocoagulation (EC) effectively removes arsenic and fluoride from water. This review highlights EC
Area of Science:
- Environmental Science
- Water Treatment Technologies
- Electrochemistry
Background:
- Growing interest in electrocoagulation (EC) for groundwater and wastewater treatment.
- EC utilizes sacrificial anode dissolution to form metal hydroxides for pollutant removal.
- EC is a versatile, efficient, cost-effective, and environmentally compatible technology.
Purpose of the Study:
- To review the application of electrocoagulation for arsenic and fluoride removal.
- To analyze approximately 80 published studies on EC for water treatment.
- To discuss the fundamentals, operating conditions, and future perspectives of EC.
Main Methods:
- Review of published literature on electrocoagulation for arsenic and fluoride removal.
- Analysis of EC fundamentals, including electrode material, current density, supporting electrolyte, and pH.
- Overview of floc characterization and energy consumption in EC processes.
Main Results:
- Electrocoagulation is a promising technology for removing arsenic and fluoride from water.
- Key operating parameters significantly influence EC efficiency.
- Floc characteristics and energy consumption are critical factors for process optimization.
Conclusions:
- Electrocoagulation offers a viable solution for treating arsenic and fluoride-contaminated water.
- Further research is needed to address challenges in industrial-scale implementation.
- Understanding operating conditions and process parameters is crucial for effective EC application.
More Related Videos
Related Concept Videos
01:06Coagulation
765
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...
765
01:17Precipitation and Co-precipitation
3.5K
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...
3.5K
04:01Factors Affecting Solubility
35.9K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
35.9K
01:08Electrodeposition
1.0K
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...
Electrodeposition can...
1.0K
00:56Extraction: Advanced Methods
864
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
864
01:09Colloidal precipitates
3.2K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
3.2K