非均相臭氧催化氧化用于难降解工业废水中试处理对比研究

Comparative Study on Heterogeneous Catalytic Ozone Oxidation for Pilot Treatment of Refractory Industrial Wastewater

摘要:

基于南通市某工业园区难降解废水深度处理需求，以FeOOH为主的铁基催化剂搭建了一套处理规模为20 m3/d非均相臭氧催化氧化中试装置，优化了系统运行参数，考察了中试装置长期运行过程中的有机物处理效果及投资运行成本，并与均相臭氧催化氧化中试装置和三相催化氧化中试装置进行了对比。结果表明，非均相臭氧催化氧化系统在臭氧浓度200 mg/L、臭氧投加气量2 L/min、催化反应时间30 min时实现了57.6±7.3%的COD去除率，优于均相臭氧催化氧化系统和三相催化氧化系统，且其占地面积小，去除单位COD的投资及运行成本为16.7元/kgCOD，仅均相臭氧催化氧化系统和三相催化氧化系统的70%左右，综合处理效能更高，具备难降解工业废水处理潜力。

Abstract:

Based on the demand for advanced treatment of refractory wastewater in an industrial park in Nantong City, a pilot plant for heterogeneous catalytic ozone oxidation with a treatment scale of 20 m3/d is built by using FeOOH as the main iron-based catalyst. The operation parameters of this system are optimized. The removal efficiency of organic matter and the investment and operation cost of the pilot plant in the long-term operation process are investigated, which is compared with the pilot plant of homogeneous catalytic ozone oxidation and the pilot plant of three-phase catalytic oxidation. The results show that the COD removal rate of the heterogeneous catalytic ozone oxidation system is 57.6±7.3% when the ozone concentration is 200 mg/L, the ozone gas dosage is 2 L/min and the catalytic reaction time is 30 min, which is better than that of the homogeneous catalytic ozone oxidation system and the three-phase catalytic oxidation system. And its occupied area is small. The investment and operation cost of removing COD per unit is RMB 16.7 yuan / kgCOD, which is only about 70% of the homogeneous catalytic ozone oxidation system and three-phase catalytic oxidation system. The comprehensive treatment efficiency is higher with the potential for treating the refractory industrial wastewater.