In regions where fresh water is scarce, seawater desalination is a go-to solution. In the desalination of seawater, activated carbon plays an important role in the pretreatment stage. It serves as a vital pretreatment step in reverse osmosis systems, helping produce safe and portable drinking water. Activated carbon is used as a water purification medium to remove organic compounds, oxidants and suspended solids that could adversely affect downstream treatment stages, RO membranes and overall process stability.
What is the Role of Activated Carbon for Seawater Desalination & Water Purification?
Pretreatment is an important stage in desalination systems. It is designed to condition the feed water before it enters the polishing and separation units. Here, activated carbon is introduced to remove contaminants that mechanical filtration is unable to remove. At Western Adsorbents & Catalysts, as a leading activated carbon manufacturer in India, we provide a range of carbons specifically made for desalination pretreatment applications.
Use of Activated Carbon for Seawater Desalination & Water Purification
#1 Protecting RO Membrane
In seawater purification, chlorine and oxidants are seen as silent killers that can damage the RO membranes. Long-term oxidation can degrade the membrane and negatively impact the service life of membranes. Activated carbon removes chlorine and oxidants in water through an adsorption mechanism, protecting the RO membrane and maintaining water quality.
#2 Removes Organic Pollutant
Raw and seawater comprise a large volume of volatile organic compounds (VOCs), natural organic matter (NOM) and kinds of chemical residues. These contaminants affect the taste of the water as well as the efficiency of RO membranes. Activated carbon, with its strong adsorption capacity, effectively adsorbs these pollutants and reduces the need for further treatment.
#3 Improves the Quality of Water
Activated carbon effectively reduces chromaticity of raw water, odour and removes contaminants. This allows the optimal water quality in RO membranes and enhances the filtration of the RO membranes. It ensures the end water quality meets safety standards.
Types of Activated Carbon Used in Seawater Desalination
- Granular Activated Carbon (GAC): The granular activated carbon is preferred for larger desalination plants. The uniform pellet sizes and well-developed pore structure make GAC ideal for column filtration.
- Powder Activated Carbon (PAC): Powder activated carbon is typically used in the pretreatment process, such as temporary surge of raw water pollutants, batch treatment and other applications.
- Extruded Activated Carbon (EAC): It is typically used in industrial-grade seawater desalination systems. The uniform particles, high hardness and excellent compression resistance make EAC ideal for high-pressure operation environments.
Activated Carbon Raw Materials for Seawater Desalination
- Coconut Shell Activated Carbon: The coconut shell activated carbon suppliers in India supply coconut shell-based activated carbon for desalination treatment. The well-developed microporous structure, large surface area, superior dechlorination effect and low ash content protect the RO membrane. Also, coconut shell activated carbon for RO pretreatment is wear-resistant and has a longer service life, making it ideal for desalination projects that require chlorine removal and stringent water quality standards.
- Coal-based Activated Carbon: The coal-based activated carbon offers a balanced pore structure, wear resistance, high hardness and relatively low costs, making it ideal for large-scale seawater.
- Wood Activated Carbon: The wood activated carbon’s large mesopore volume makes it suitable for large molecular particles and hence for seawater desalination systems.
Choose Western Adsorbents & Catalysts Activated Carbon for Desalination Applications
Western Adsorbents & Catalysts is one of the largest activated carbon manufacturers in the world, offering a range of carbon solutions for desalination systems. With expertise in adsorption media and industrial purification applications, W.A.C. supports various water treatment systems. For more information, call us today.