Preparation of adsorbent made from sewage sludge and its desulfurization mechanism

By using different activation methods,the adsorbents for flue gas desulfurization were made from biochemical sewage sludge and surplus sludge as raw materials which came from petrochemical plants or municipal wastewater,and the influencing factors on the adsorbent abilities of the product were also studied.Results indicated that the adsorbent made by pyrolytic charring from surplus sludge was the better one.The adsorption processes behave as Freundlich model.In the system of SO_2-O_2-N_2,the major adsorption was the physical one,but in SO_2-O_2-H_2O(g)-N_2 system,it's the chemical,because of catalysis and oxidation of SO_2 in sludge adsorbent.