摘要：

随着再生水用途的不断拓展，反渗透工艺在城市污水再生处理中的应用日益广泛。然而，城市污水的反渗透浓水具有污染物种类复杂、浓度高、难生物降解等特点，亟需开发经济高效的处理技术。采用臭氧高效催化氧化法对反渗透浓水进行处理。中试研究结果表明，过渡金属离子臭氧均相催化氧化工艺处理反渗透浓水时，COD去除速率始终< 20 mg/（L·h），且出水水质不稳定，受膜清洗废水冲击时几乎无法去除COD。臭氧均相/非均相催化氧化去除COD效果好，稳定性高，适于浓水处理。反渗透浓水的COD去除速率明显提升，最高可达56 mg/（L·h）。当进水COD为42~96 mg/L，出水COD可控制在16~48 mg/L，稳定达到GB 18918—2002一级A排放标准要求。与臭氧均相催化氧化相比，臭氧均相/非均相催化氧化去除单位COD的臭氧消耗量下降26%。

关键词: 反渗透浓水, 臭氧, 催化氧化, 深度处理, 城市污水

Abstract:

With the expansion of usage of reclaimed water, reverse osmosis(RO) technology has been increasingly used in municipal wastewater reclamation process. However, the reverse osmosis concentrate generated from municipal wastewater reclamation process contains varieties of bio-refractory pollutants in relatively high concentration. It is needed to develop efficient and economical treatment methods for RO concentrate. Catalytic ozonation technology was used to treat the reverse osmosis concentrate. The results of pilot test showed that the COD removal rate was always < 20 mg/(L·h) in the treatment of reverse osmosis concentrate by ozone homogeneous catalytic oxidation of transition metal ions, the effluent quality was unstable. It was almost impossible to remove COD when impacted by membrane cleaning wastewater. Homogeneous/heterogeneous catalytic ozonation showed good and stable performance on COD removal, indicating that it was suitable for treatment of RO concentrate. The COD removal rate of RO concentrate was significantly higher, up to 56 mg/(L·h). When the influent COD is 42-96 mg/L, the effluent COD can be controlled at 16-48 mg/L, which can stably meet the requirements of Class A of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant. Compared with homogeneous catalytic ozonation, homogeneous/heterogeneous catalytic ozonation could reduce the ozone consumption of COD by 26%.

Key words: reverse osmosis concentrate, ozone, catalytic oxidation, advanced treatment, municipal sewage

中图分类号: 

• X703