Coconut shell activated carbon adsorption capacity and pore size and structure of coconut shell activated carbon related. In general, the smaller the particle, the pore diffusion faster, coconut shell activated carbon adsorption capacity of the stronger. Adsorption of water pH and temperature also have an impact on the coconut shell activated carbon. Coconut shell activated carbon is generally under acidic conditions than under alkaline conditions have a higher adsorption. Adsorption reaction is exothermic usually shell activated carbon plant, so that the temperature on the adsorption reaction is advantageously low. Of course, coconut shell activated carbon adsorption capacity of the sewage concentration. At a certain temperature, the amount of coconut shell activated carbon adsorption with the substance to be adsorbed improve equilibrium concentration increases. 3, coconut shell activated carbon used in waste water treatment due to the coconut shell activated carbon pre-treatment requirements for water is high, and coconut shell activated carbon is expensive, so in effect wastewater treatment activated carbon shell, coconut shell activated carbon is mainly used to remove the wastewater trace contaminants shell activated carbon water purification, in order to achieve the depth of purification purposes. 3.1 coconut shell activated carbon treatment of wastewater containing chromium is chromium plating a larger amount of a metal material, hexavalent chromium with different pH values ??in different forms were present in the wastewater.