Thermal Regeneration of Powdered Carbon Prepared from Spent Biological Activated Carbon
In this study,spent biological activated carbon was ground into a powdered carbon to achieve resource utilization in drinking water plants.The effects of thermal regeneration temperature on the physicochemical properties of powdered carbon were explored,and the removal efficacy of regenerated powdered carbon on typical organic pollutants in water was investigated.The results showed that the pyrolysis of powdered carbon went through three processes:desorption of water molecules(35-105℃),desorption of volatile organic compounds(105-400℃),and pyrolysis of organic compounds with high boiling point(400-735℃).Thermal regeneration could significantly restore the pore structure of powdered carbon,and the recovery rate of iodine value and methylene blue value could be up to 83.1%and 75.9%,respectively.Moreover,the recovery rate increased gradually with increasing regeneration temperature.Thermal regeneration could lead to a decrease in the acidic functional group content and an increase in the alkaline functional group content of powdered carbon.The elemental oxygen content in the surface of powdered carbon first increased and then decreased as the regeneration temperature was increased.Thermal regeneration abated the leaching of water-soluble organic matter from powdered carbon.Finally,thermal regeneration can significantly improve the removal of typical organic pollutants by powdered carbon in raw water,and the removal rate increased by 7.7%-35.9%.
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