Energy Sources Part A-recovery Utilization and Environmental Effects, Vol.40, No.5, 473-479, 2018
Municipal Solid Waste Leachates Destruction and Metals Recovery by Supercritical Water Oxidation
Municipal solid waste leachate dissolved with nitrates of Cr, Pb, and Cu was investigated using a supercritical water oxidation process in this study. The destruction efficiency of chemical oxygen demand increased with the higher temperature and longer reaction time. A first-order expression applied for chemical oxygen demand was determined with a pre-exponential factor of 318 s(-1) and activation energy of 58 kJ/mol. Recovery efficiency of Cr, Pb, and Cu from initial solution into solid product increased with the higher temperature and longer reaction time. X-ray diffraction of solid products showed that the metal species were found to be Cu2O, HCrO2, and CaCO3 at temperature 400 degrees C, while the structure were identified as CuO, Cr2O3, PbCrO4, and CaCO3 at temperature 500 degrees C.