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Do you know how to use granular activated carbon filters?

Granular activated carbon (GAC) is a hybrid mixture of a wide variety of graphite platelets that are interconnected by nongraphitic carbon bonding. The adsorptive capacity of GAC makes it ideal for removing a variety of contaminants from water, air, liquids and gases. yongruida activated carbon pellets GAC is also an environmentally responsible product that can be reactivated through thermal oxidation and used multiple times for the same application.

The U.S. Environmental Protection Agency (EPA) and most state-based departments of health consider adsorption by Granular activated carbon to be the best available technology for the removal of many organic materials in surface water. On its own or paired with an ultraviolet (UV) disinfection system, GAC can facilitate the removal of:

Disinfection byproducts (DBPs) associated with chlorine and alternative disinfectants
Algal toxins, such as microcystin-LR, cylindrospermopsin and anatoxin-A
Endocrine-disrupting compounds
Pharmaceuticals and personal care products
Taste and odor-causing compounds
Organic materials from decaying plants and other naturally occurring matter which serve as the precursors for DBPs

Adsorption results from the interaction of the electronic structure of an adsorbent, such as activated carbon, with an adsorbate, such as a taste- and odor-causing compound like geosmin. Molecular compounds are kinetically attracted to the porous surface area of the carbon.

Conventional Granular activated carbon filters are sensitive to the same mechanical operating upsets as typical multimedia filters. As a result, the filters should not be subjected to sudden changes in water velocity during production operation, during backwash or startup online. Depending on the filter design, it is recommended that a minimum of 30 seconds is used to bring backwash water to full flow in the filter. When the unit is brought back online, a minimum of 10 minutes is recommended for bringing the filter back to full flow. Operators should account for seasonal water density changes during backwashing and periodically observe a backwash event.

To better maintain the filter, it is recommended that core samples be taken once per year. The purpose of the procedure is to collect an accurate sample from the core of the filter. coalactivatedcarbon.com The Granular activated carbon can then be tested for residual activity, which is determined using an iodine number test. Historical data suggests that once the iodine number is between 450 and 550, the Granular activated carbon should be reactivated or exchanged in the near future.

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