Activated carbon is one of the widely used adsorbents in water treatment adsorption method. It is a specially treated carbon with numerous tiny pores and huge surface area. The surface area of each gram of activated carbon is 500 square meters to 1500 square meters.
Activated carbon has strong physical adsorption and chemical adsorption, and also has a detoxification effect. Detoxification is to use its huge area to adsorb poisons in activated carbon, thereby preventing the absorption of poisons.
Activated carbon is usually divided into powdered carbon and granular carbon. The former is used for wastewater treatment, usually by suspension contact adsorption; the latter is used for wastewater treatment, by filtration-adsorption.
There are two types of treatment systems: one is to use activated carbon to directly treat the secondary treatment effluent; the other is to use the granular carbon to adsorb the secondary treatment effluent after chemical clarification, removal of nutrients, and filtration.
Activated carbon treatment of COD in wastewater
Activated carbon mainly has a strong adsorption effect on organic matter with a relative molecular mass of less than 3000, especially 500 to 1000. Among various advanced treatment technologies for improving water quality, activated carbon adsorption is one of the most mature and effective methods to improve conventional treatment processes to remove organic pollutants in water, and activated carbon has strong adaptability to changes in water quantity, water quality and water temperature during use.
