The process of urbanization is accelerating, with high energy consumption and large amount of garbage. We need to concentrate on reducing rubbish. Waste incineration has become one of the main means of waste treatment. It involves the heat treatment of waste reduction, space saving, elimination of multiple pathogens, and conversion of toxic and harmful substances into harmless materials. However, fly ash contains more soluble salts and HMS production through incineration of garbage, which will pollute water and soil, cause environmental pollution and endanger human health. So if we use Activated carbon Reducing the content of heavy metals in fly ash can reduce its harm to the ecological environment, reduce the possibility of environmental accidents, and solve environmental safety problems.

Activated carbon As a non-polar adsorbent, it is one of the widely used adsorbents in the current experiment. It has a wide range of use, is easy to obtain and relatively cheap. It has good adsorption capacity and stable chemical properties: acid and alkali resistance, high temperature resistance, high pressure and water erosion resistance, and can also be used repeatedly through activation and regeneration. Although compared with inorganic HMS activated carbon, it is an effective absorbent for organic compounds such as cadmium, copper, lead and chromium. The fixation of heavy metals can be improved by changing the molding conditions to improve their surface properties. In most reported cases, chemical activation was optimized to obtain better porous activated carbon.