臭氧降解高浓度腐殖酸动力学

Degradation Kinetics of Ozone Oxidation on High Concentration of Humic Substances

采用臭氧氧化法降解高浓度腐殖酸废水,并研究了臭氧对腐殖酸的降解动力学,考察了臭氧投量、初始腐殖酸浓度、初始pH和反应温度对臭氧降解高浓度腐殖酸废水的影响.结果表明,在臭氧投量为3.46 g.h-1,初始腐殖酸浓度为1 000mg.L-1,初始pH=8.0,反应温度为303 K,反应30 min的条件下,腐殖酸的去除率达到89.04%.在臭氧投量为1.52～6.01g.h-1,初始腐殖酸浓度为250～1 000 mg.L-1,初始pH为2.0～10.0,反应温度在283～323 K的范围内,臭氧降解腐殖酸符合拟一级动力学模型,通过对实验数据拟合,得到反应动力学方程,反应活化能较低(Ea=1.30×104J.mol-1),并且模型计算数值与实际数据吻合良好(平均相对误差为7.62%).

Humic substance oxidation（HS） degradation by ozone was kinetically investigated.The effects of O3 dosage,initial pH,temperature and initial concentration of HS were studied.Under the conditions of 3.46 g·h-1 ozone dosage,1 000 mg·L-1 initial HS,8.0 initial pH and 303 K temperature,the removal efficiencies of HS achieved 89.04% at 30 min.The empirical kinetic equation of ozonation degradation for landfill leachate under the conditions of 1.52-6.10 g·h-1 ozone dosage,250-1 000 mg·L-1 initial HS,2.0-10.0 initial pH,283-323 K temperature fitted well with the experimental data（average relative error is 7.62%）,with low activation energy Ea=1.43×104 J·mol-1.