| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 147947 | Chemical Engineering Journal | 2014 | 9 Pages |
•An effective pilot-scale continuous flow microwave radiation system was developed.•Influences on the system were studied via comparisons of observed rate constants.•Range of intrinsic rate constant in the system was estimated.•Application feasibility of microwave in industrial scale was discussed.•Microwave-Fenton process is effective for the removal of p-Nitrophenol wastewater.
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 nH2O2/np-NP was 13.9, nH2O2/nFe(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%). The process obeyed the pseudo first-order kinetics by assuming a constant concentration of OH·. The apparent activation energy of p-NP degradation, calculated by Arrhenius equation, was 44.89 kJ mol−1. The range of intrinsic reaction rate constants of p-NP degradation under optimal conditions in the continuous flow MW irradiation system was from 1.09 × 108 L mol−1 s−1 to 2.63 × 108 L mol−1 s−1. The pilot-scale study prompts the potential industrial application of MW-Fenton oxidation process in rapid and effective removal of refractory toxic organic pollutants from wastewater.
