Modification of coagulation and Fenton oxidation processes for cost-effective leachate treatment

Physicochemical processes have been used to remove nonbiodegradable organic compounds in leachate generated from sanitary landfills. In this study, a coagulation process combined with Fenton oxidation was evaluated for the re moval of refractory organics in leachate. Recycling of sludge generated fro m Fenton oxidation to a coagulation process was attempted to reduce operati on cost and to improve organic removal rate. The addition mode of Fenton re agent was also modified to obtain a better organic removal rate and more co st-effective operation. With Fenton sludge recycling, 9% higher COD removal was obtained, and the sludge to be disposed could be reduced up to 50%. Al so, the coagulant could be reduced by 50%. For Fenton oxidation process, st epwise addition of reagents gave a 5% higher COD removal, and a 25% reducti on in chemical consumption.