THE CHARACTERISTICS OF COAGULATION OF FENTON REACTION IN THE REMOVAL OF LANDFILL LEACHATE ORGANICS

The need to improve the Fenton process, which is one of the leachate t reatment trains at Metropolitan Landfill in Korea was raised. This stu dy was intended to compare the Fenton reaction with coagulation in rem oving landfill leachate organics of specific size. The organics fracti onated by ultrafiltration and measured by TOC, were selected for evalu ating the characteristics of the removal of organics. From this study it was found that the organic removal pattern in the Fenton reaction w as quite similar to coagulation. Both reactions removed large leachate organics more readily and selectively. For example, coagulation remov ed 59 similar to 73% of organics larger than molecular weight (MW) of 500 and only up to 18% of organics less than MW of 500. On the other h and, the Fenton process removed 72 similar to 89% of organics larger t han MW of 500 and only up to 43% of organics less than MW of 500. It w as interpreted that the coagulation step in the Fenton process had a p rimary role in selective removal of leachate organics, though the Fent on reaction is not coagulation. However, since the efficiency of organ ic removal in the Fenton reaction was higher than coagulation, the Fen ton process in Metropolitan Landfill leachate treatment process may be called '' a type of enhanced coagulation''. (C) 1998 Published by Els evier Science Ltd. All rights reserved.