Activated carbon filter uses granular activated carbon to further remove residual chlorine, organic matter, and suspended impurities in the effluent of the mechanical filter, providing good conditions for subsequent reverse osmosis treatment.
The activated carbon filter mainly uses activated carbon organic flocs with high carbon content, large molecular weight and large specific surface area to physically adsorb impurities in the water to meet the water quality requirements. When the water flows through the pores of the activated carbon, various suspended particles, organic matter, etc. At the same time, the chlorine (hypochlorous acid) adsorbed on the surface of the activated carbon undergoes a chemical reaction on the surface of the activated carbon and is reduced to chloride ions, thereby effectively removing chlorine and ensuring that the residual chlorine in the effluent is less than 0.1 ppm, which meets the operating conditions of the RO membrane. With the passage of time, the retentate in the pores of the activated carbon and between the particles gradually increases, so that the pressure difference between the front and rear of the filter increases until it fails. Under normal circumstances, according to the pressure difference between the front and rear of the filter, reverse water flow is used to backwash the filter material, so that most of the retentate adsorbed in the pores of the activated carbon is stripped and taken away by the water flow, and the adsorption function is restored; when the activated carbon reaches the saturated adsorption capacity completely When it fails, the activated carbon should be regenerated or replaced to meet the engineering requirements.
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