Activated carbon is a kind of adsorbent widely used in the field of water treatment. Because it contains a large number of micropores, it has a huge specific surface area for some substances in sewage that are difficult to remove (such as surfactants, phenols, pesticides, fuels, difficult to degrade biological organic matter and heavy metal ions, etc.) with high processing efficiency. Activated carbon adsorption method is widely used in the advanced treatment of sewage with the advantages of wide range of adaptation, good treatment effect, recyclable useful materials, absorbent and reusable.