Activated Carbon Filter Manufacturer: An Introduction to What an Activated Carbon Filter Is

In water quality pretreatment systems, activated carbon filters adsorb residual chlorine that cannot be removed by upstream filtration, thereby preventing oxidation and degradation of downstream reverse osmosis membranes. They also adsorb trace amounts of small-molecule organic compounds and other contaminants that may leak from upstream stages, effectively removing odors, colloids, pigments, heavy metal ions, and other pollutants from the water, while simultaneously reducing COD. Furthermore, they can lower the SDI of the feed water entering the RO system, ensuring compliance with SDI specifications. What is the product description for activated carbon filters?

An activated carbon filter pressure vessel is a pressurized container internally packed with activated carbon, and its operation relies on the passage of water through a bed of granular activated carbon. The activated carbon particles that make up this bed possess an extensive network of micropores and a very large specific surface area, giving them strong physical adsorption capacity. As water flows through the carbon bed, organic contaminants in the water are effectively adsorbed by the activated carbon. In addition, the amorphous surface of the activated carbon contains oxygen-containing functional groups, which further enhance the adsorption of organic pollutants from the water as it passes through the bed. Activated carbon filters are widely used water-treatment equipment; when employed as part of a pre-treatment stage in a desalination system, they help extend the service life of downstream equipment, improve water quality, and prevent fouling—particularly the poisoning of downstream reverse-osmosis membranes and ion-exchange resins caused by residual chlorine in the feed water.

The primary factors influencing the adsorption performance and service life of activated carbon filters include the type and concentration of pollutants, the residence time of air within the filter media, and the temperature and humidity of the air. In practical applications, the filtration configuration and the type of activated carbon should be selected based on such parameters as the nature and concentration of the pollutants and the volume of air to be treated.

Good dust-filtering filters should be installed both upstream and downstream of the activated-carbon filter, with an efficiency rating of F7 or higher. The upstream filter prevents dust from clogging the activated-carbon media, while the downstream filter captures dust released from the activated carbon itself. So, how does an activated-carbon filter work?

The activated carbon filter utilizes granular activated carbon to further remove residual chlorine, organic matter, and suspended solids from the water through mechanical filtration, thereby creating favorable conditions for subsequent reverse osmosis treatment.

Activated carbon filters primarily rely on the high carbon content, large molecular weight, and extensive specific surface area of activated carbon aggregates to physically adsorb impurities from the water, thereby meeting water quality requirements. As water passes through the pores of the activated carbon, van der Waals forces cause various suspended particles and organic substances to be adsorbed into these pores. Simultaneously, chlorine (hypochlorous acid) adsorbed on the surface of the activated carbon undergoes a chemical reaction, being reduced to chloride ions, which effectively removes residual chlorine, reducing its concentration in the effluent to less than 0.1 ppm and satisfying the operating conditions for reverse osmosis membrane systems. Over time, the pore size and interparticle spacing within the activated carbon gradually increase, until the pressure differential across the filter element reaches a point where filtration can no longer be maintained. Under normal circumstances, the filter is backwashed in a counter-current flow to dislodge most of the retained contaminants adsorbed in the activated carbon pores, carrying them away with the wastewater and restoring the adsorption capacity. When the activated carbon reaches its saturation adsorption capacity, it must be regenerated or replaced to meet engineering requirements.