Pilot-scale treatment of p-Nitrophenol wastewater by microwave-enhanced Fenton oxidation process: Effects of system parameters and kinetics study

摘要

A pilot-scale microwave-Fenton (MW-Fenton) process in a continuous flow microwave irradiation system was studied by the degradation of p-Nitrophenol (p-NP) in wastewater. The results showed that the amount of hydroxyl radicals (OH~·) in MW-Fenton process was 2.8 times higher than that in conventional Fenton process at 7 min. The maximum p-NP removal efficiency (93.2%) was measured at pH 3.3 when n_(H2O2)_(p-NP) was 13.9, n_(H2O2)_(Fe(II)) was 81.6 and the hydraulic detention time was 12 min by mixing p-NP and H2O2 solution firstly, and then adding Fe(II) solution. The energy efficiency in the pilot-scale process was estimated to be 75.5%, superior to our previous lab-scale treatment result (less than 70%).