臭氧降解丁香酚的效果及动力学分析

Effect and Kinetics Analysis of Eugenol Degradation by Ozone

采用臭氧氧化法降解含水溶性木素衍生物丁香酚的模拟废水,考察了初始p H值、丁香酚初始浓度、臭氧质量浓度和温度对臭氧氧化降解丁香酚过程中CODCr去除效果的影响,并对降解过程中CODCr去除反应的动力学进行研究.结果表明：臭氧对丁香酚具有良好的氧化降解效果,在p H=11、丁香酚初始浓度为1 mmol/L、臭氧质量浓度为24.83 mg/L、温度为25℃的条件下,臭氧降解丁香酚过程中的CODCr去除率可达67.77%;臭氧氧化降解丁香酚过程中CODCr的去除反应符合两段拟一级反应动力学特征;采用幂指数方程分析反应动力学,可分别得到0~10 min和10~60 min反应时间内CODCr去除反应的动力学方程.

Ozone was employed to degrade the water-soluble lignin-derived compound eugenol in a simulated wastewater system, and the effects of pH value, initial eugenol concentration, ozone mass concentration and reac- tion temperature on the CODCr removal as well as the corresponding kinetics were investigated. Experimental results show that （1） the ozonation process is effective in degrading eugenol; （2） the CODCr removal is up to 67.77% after the ozonation with an initial eugenol concentration of 1 mmol/L and with an ozone mass concentration of 24.83 mg/L at 25 ℃ and pH 11 ; （3） the CODCr removal of eugenol accords well with the two-stage pseudo-first- order kinetics; and （4） the exponential function is effective in analyzing the ozonation kinetics and obtaining the kinetic models desCribing the CODCr removal within 0 ~ 10 min and 10 ~ 60 min, respectively.