以典型的偶氮染料甲基橙人工配制的模拟废水为研究对象，通过静态实验考察了高级还原技术处理偶氮染料废水的影响因素，探究了其降解机理。实验结果表明，在紫外光照射下，亚硫酸钠的质量浓度为0.2 g/L、pH=6、原水质量浓度为20 mg/L、反应80 min时，甲基橙废水的去除率可达67%。强还原性自由基光生电子是高级还原技术处理偶氮染料废水的主要活性物质，偶氮键被破坏。高级还原技术可用于偶氮染料废水的处理。

Methyl orange,a typical azo dye,is used to prepare simulated wastewater as the research object,the affecting factors and mechanisms for treating with azo dye-containing wastewater by the advanced reduction process are studied via static experiments.The experimental results show that the removal rate of methyl orange sulfite can reach 67% after experiencing 80 min of reaction under ultraviolet irradiation,with sodium sulfite as reduction agent,pH=6,the concentration of raw water being 20 mg·L^-1 and the dosage of reduction agent being 0.2 g·L^-1.The experimental results show that sodium sulfite produces a strong reductive free radical-photoelectron,which is the main active substance in the degradation of methyl orange wastewater,fading azo bond to degrade azo dye under deoxidization conditions.This advanced reduction process can be used to treat azo dye-containing wastewater efficiently.