PRODUCTION OF ACTIVATED CARBON BY SLUDGE, APPARATUS THEREFOR AND SLUDGE ACTIVATED CARBON

摘要

PROBLEM TO BE SOLVED: To produce a method for producing high-quality sludge activated carbon capable of making sludge coal porous without using a chemical activating method with fear of occurrence of secondary environmental pollution, simplified in production process, capable of industrially mass-producing and excellent in absorption at a low cost. ;SOLUTION: Concentrated sludge 2 of sewage is mixed with sodium silicate aqueous solution 3 and the mixture is stirred and subjected to dehydration treatment to afford dehydrated sludge cake having 75-80% water content and the dehydrated sludge cake 4 is dried to 40-50% water content and subjected to compression molding in a prescribed form such as pellet and the dehydrated sludge molded product 6 is dried up to 5-10 water content by heating at far- infrared ray radiating temperature of 100-200°C and the dried sludge molded product 6' is subjected to dry distillation at 600-1,000°C to carbonize the molded product. As a result, the molded product 6' is made porous by utilizing foaming phenomenon of sodium nitrate aqueous solution 3 and the porous and carbonized sludge coal 7 is subjected to steam activation and washed with dilute hydrochloric acid and warm water several times to produce activated carbon.;COPYRIGHT: (C)1999,JPO