Introduction of activated carbon. According to the shape can be divided into: activated carbon powder and granule and irregular granular, cylindrical, spherical, etc. According to the different of the raw materials can be divided into: coconut shell activated carbon, nut shell activated carbon, wood activated carbon (powder, coal column activated carbon, etc. Applications in water purification activated carbon, activated carbon used in industry is relatively common active carbon. Activated carbon is widely used in tap water, petroleum, chemical, electric power, industrial wastewater and urban water supply and drainage area. Gas phase adsorption activated carbon adsorption of pollutants is exposed by air molecules for purifying effect. Liquid phase adsorption activated carbon is commonly columnar grain, specific surface area, pore developed, high mechanical strength, adsorption speed, purifying degree is high, not easy off powder, long service life. Can effectively remove odor, chlorine, cyanide, and a variety of harmful substances such as heavy metal ions and decoloring.