The activated carbon filter uses the granular activated carbon to further remove residual impurities of residual chlorine, organic matter and suspended matter in the effluent of the mechanical filter, and provides favorable conditions for the subsequent reverse osmosis treatment.
Activated carbon filter mainly uses activated carbon organic floc with high carbon content, large molecular weight and large specific surface area to physically adsorb impurities in water to meet water quality requirements. When water flows through the pores of activated carbon, various suspended particles and organic matter are in Van der Waals force. Under the action of being adsorbed in the pores of activated carbon; at the same time, chlorine (hypochlorous acid) adsorbed on the surface of activated carbon chemically reacts on the surface of carbon, and is reduced to chloride ion, thereby effectively removing chlorine and ensuring that the residual chlorine content of the effluent is less than 0.1. Ppm, which satisfies the operating conditions of the RO membrane. Over time, the retentate between the pores of the activated carbon and the particles gradually increases, so that the pressure difference between the front and the back of the filter increases until it fails. Under normal circumstances, according to the pressure difference between the front and the back of the filter, the reverse filter is used to backwash the filter material, so that most of the retentate adsorbed in the pores of the activated carbon is peeled off and taken away by the water flow to restore the adsorption function; when the activated carbon reaches the saturated adsorption capacity thoroughly In the event of failure, the activated carbon should be regenerated or replaced with activated carbon to meet engineering requirements.