title: Pretreatment of old-age landfill leachate by microwave-assisted catalytic oxidation in the presence of activated carbon.
abstract: Landfill leachate is posing an ever-greater environmental hazard. Recently, a process for purification combining activated carbon, microwave (MW) and Fenton oxidation has drawn much attention. In this study, the effectiveness of this process for the pretreatment of an old-age landfill leachate was tested. The effects of various parameters were investigated and the optimal condition included as follows: MW energy density, 6 W/mL; MW power, 300 W; radiation time, 8 min; H2O2 dosage, 0.1 mol/L; Fe(2+)-EDTA dosage, 0.02 mol/L; granular activated carbon (GAC) dosage, 6 g/L. Within the present experimental condition applied, the chemical oxygen demand (COD) removal reached 56.5%, and the ratio of 5-day biochemical oxygen demand to chemical oxygen demand (BOD5/COD) was enhanced from 0.122 to 0.462. Comparing with GAC, MW and Fenton alone or the combinations of any two of them, MW/Fenton/GAC displayed superior treatment efficiency. The MW/Fenton/GAC process is believed to be a promising pretreatment technology for biorefractory old-age landfill leachate.
authors: School of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China.
authors: Xiao-Chun
authors: XC
authors: Xu
authors: School of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China.
authors: Hong-Tao
authors: HT
authors: Zhang
authors: School of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China.
authors: Zhi-Yong
authors: ZY
authors: Dong
authors: School of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, People's Republic of China.
authors: Yu-Feng
authors: YF
authors: Fan
mesh_terms: D002606:Charcoal / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008872:Microwaves; D010084:Oxidation-Reduction; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: C045076:Fenton's reagent; D014874:Water Pollutants, Chemical; D002606:Charcoal; D006861:Hydrogen Peroxide; D007501:Iron