摘要：

反渗透技术广泛应用于工业废水的深度处理与回用过程，但其产生的浓水含盐量较高，有机污染物降解难度大。臭氧氧化技术具有氧化能力强、操作简单等优点，可用于水中有机物的氧化降解，但单独采用臭氧氧化时对有机物有选择性，处理效果有限。采用紫外光-臭氧耦合技术处理钢铁行业的2种反渗透浓水，探究臭氧浓度、紫外光照强度和初始pH对COD去除效果的影响，并利用三维荧光光谱分析处理前后反渗透浓水的水质变化情况。结果显示，钢铁综合废水和焦化废水处理的最佳操作参数基本相同，在最佳反应条件下，紫外光-臭氧耦合氧化60 min后，2种反渗透浓水的COD去除率分别达到73.3%、53.8%；浓水中难以降解的物质为可溶性微生物代谢产物。

关键词: 高级氧化, 工业废水, 反渗透浓水, 三维荧光光谱

Abstract:

Reverse osmosis is widely used for industrial wastewater treatment and reuse. However, it results reverse osmosis concentrates(ROCs) are difficult to treat because of the high salt content and persistent organic pollutants. Ozonation technology has the advantages of strong oxidation ability and simple operation, which can be used for the oxidation and degradation of organic matter in water. However, ozonation has selectivity to organic matter when it uses alone, and the treatment effect is limited. UV/O₃ coupled process was used to treat two kinds of ROCs of steel industry. The effects of ozone concentration, ultraviolet light intensity and initial pH on the COD removal were explored. The changes in water quality before and after treatment were characterized by three-dimension excitation emission matrix fluorescence spectroscopy. The results showed that the optimal operating parameters for the ROCs of iron and steel wastewater and coking wastewater were similar, and under the optimal reaction conditions, after 60 min of UV/O₃ coupled oxidation, the removal rates of COD in two kinds of ROCs reached 73.3% and 53.8% respectively. The refractory substances in ROCs were soluble microbial metabolites.

Key words: advanced oxidation, industrial wastewater, reverse osmosis concentrate, three-dimension excitation emission matrix

中图分类号: 

• X703