Granular activated carbon (GAC) is commonly used as an adsorption medium in many surface water treatment plants. However, most plants also rely on GAC to provide efficient filtration, as reducing turbidity is an essential element in maintaining the desired water quality. GAC are often used with sand and gravel, providing many additional benefits when used as a filter medium. these benefits come from GAC adsorption properties rather than other filtration media.
Correct application of GAC is essential for obtaining the desired performance.For filtration performance, mesh size, fabrication techniques and starting materials play the greatest role. Reunified bituminous coal-based GAC offer a common choice for their superior strength, higher density and wear resistance. Different particle sizes have their own specific niche depending on the application.
Besides the importance of GAC adsorption benefit, the filtration benefit is also significant because GAC has the dual role of efficient filtration media. As a result, GAC particles are usually larger than conventional sand media, so design and performance need to be considered in order to correctly use GAC advantages in surface water plants.
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