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 removal of refractory organics in leachate. Recycling of sludge generated from Fenton oxidation to a coagulation process was attempted to reduce operation cost and to improve organic removal rate. The addition mode of Fenton reagent was also modified to obtain a better organic removal rate and more cost-effective operation. With Fenton sludge recycling, 9% higher COD removal was obtained, and the sludge to be disposed could be reduced up to 50%. Also, the coagulant could be reduced by 50%. For Fenton oxidation process, stepwise addition of reagents gave a 5% higher COD removal, and a 25% reduction in chemical consumption.
Yoo
H C
HC
Environmental Technology Research Team, Daewoo Institute of Construction Technology, Suwon, Kyunggi 440-210, Korea. hcyoo@mail.dwconst.co.kr
Cho
S H
SH
Ko
S O
SO
D003362:Cost-Benefit Analysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D009930:Organic Chemicals; D010084:Oxidation-Reduction; D012037:Refuse Disposal / Q000191:economics / Q000379:methods*; D012722:Sewage / Q000737:chemistry*
C045076:Fenton's reagent; D009930:Organic Chemicals; D012722:Sewage; D006861:Hydrogen Peroxide; D007501:Iron