Study On Degradation Of Molasses Fermentation Wastewater By Homogeneous Catalysis Under Ultrosonic Radiation

In this dissertation,the sources and characteristics of molasses fermentation wastewater had been analysed systematicly and degradation of molasses fermentation wastewater under individual ultrasonic(US)radiation or combined US/H₂O₂ system,and US/H₂O₂/transition-metal-ion system had been studied.The resouts showed that ultrasonic intensty,pH value and initial concentration altered noticeably the reaction rates under individual ultrasonic radiation with preferable operating conditions as low pH,low temperature and using abundance oxygen as saturating gas et al.basing the study on degration effect and mechamism and various influence factors of molasses fermentation wastewater by homogeneous catalysis during the sonochemical experiments.The influence factors including concentration of H₂O₂,molasses fermentation wastewater and some transition metal ions are investigated during the sonochemical experiments by using US/H₂O₂ system in a bench scale.It was found that degradation rate was merely 5.1%under individual ultrasonic radiation and the addition of H₂O₂ increased the the removal of COD up to 55.91%,that showed that the addition of H₂O₂ was favorable to the removal of COD,however,the excess of H₂O₂ does not significantly affect the removal efficiency.The co-existence of transition metal ions has significant influence upon the reaction rates.The addition of Fe²⁺increases the reaction rates up to 64.8%,and Cu²⁺53.26%,Fe³⁺48.31%,Ni²⁺53.46%,and the reaction had been shortened visibly.This indicated that there existed synergetic effects in the individual US and Fenton reagent oxidation process.In this paper,the synergetic kinetics of molasses fermentation wastewater treatment by using US/H₂O₂ system was studied.It was found that molasses fermentation wastewater degradation followed pseudo-first order reaction under individual US radiation or individual Fenton reagent oxidation system process,while it significantly enhanced in the combined US/Fenton reagent oxidation system.