Ultrasonic Joint Fenton Reagent Degradation Of M-cresol

Ultrasound is a novel wastewater treament method in recent years .It has many advantages in toxic and no biodegradable organic wastewater treament. Therefore m-cresol (a priority toxic pollutant) is chosen as degradation substance to study the sonochemical technology in this paper .A pulsing sonifer with a frequency at 20kHz is used to study the sonochemical technology .The work is divided into two parts:1. Sonochemical degradation of m-cresol in aqueous solution to affect the degradation efficiencySeveral factors are studied in detail, which include the initial concentration ,the initial pH,the energy density,the reaction temperature and the presence of saturated gas.M-cresol could be degraded by a pulsing ultrasound with a frequency at 20kHz. The degradation rate increases with the decrease of the initial concentration and the increase of acidity。 The fomer is related to the gaseous M-cresol in the cavitation bubbles, which the gaseous M-cresol in the cavitation bubbles decrease the cavitation intensity and degradation rate。 The latter is the presence form of M-cresol in aqueous solution, which is changed by the initial pH and then affect the route of reaction。 Changes of the reaction temperature have almost no effect on the degradation of the M-cresol .The degradation effect is improved with the presence of saturated gas during the process of sonochemical degradation 。2. Degradation of M-cresol in aqueous solution by ultrasound/Fenton reagent processThe degradation of M-cresol in water by ultrasound/Fenton reagent process has an obvious synergistic effect .The effects of several factors is studied on degradation of m-cresol in aqueous solution, such as the initial pH , the proportion of initial H₂O₂ and FeSO₄ ,the initial concentration of H₂O₂ and the reaction temperature .The degradation rate increases with the decrease of the initial pH and the increase of acidity。 The appropriate proportion of initial H₂O₂ and FeSO₄ is 9:1 .The degradation efficiency is great enhanced with increasing of the initial concentration of H₂O₂. the...