中文摘要：

针对合有高浓度聚乙烯醇（PVA）的印染退浆废水可生化性差的问题，采用零价铁（ZVI）降解PVA，研究了ZVI投加量、初始pH值、反应温度、DO浓度等因素的影响，采用加入羟基自由基屏蔽剂的间接方法和电子自旋共振波谱检测羟基自由基的直接方法探究了反应机理，并分析了ZVI降解PVA的反应动力学。结果表明，增加ZVI投加量、降低溶液初始pH值、升高反应温度、增加DO浓度能够提高零价铁对PVA的去除率，采用微气泡曝气可使PVA去除率提高10％，在酸性有氧条件下ZVI对PVA的去除作用主要归因于类芬顿反应中产生的羟基自由基。

英文摘要：

To solve the problem of poor biod egradability of desizing wastewater containing high concentration of polyvinyl alcohol （PVA）, zero-valent iron （ZVI） was used to degrade PVA. ence of ZVI dosage, initial pH, reaction temperature and DO concentration on the degradati The influ- on of PVA was investigated. The degradation mechanisms using an indirect method of hydroxyl radical scavenger and a direct method of radical detection by electron spin resonance （ESR） were studied, and the degradation kinetics of PVA by ZVI higher temperature, and were analyzed. The results showed that larger ZVI dosage, lower initial pH, higher DO concentration could improve the degradation rate of PVA by ZVI, and under the condition of microbubble aeration, the removal rate of PVA could be increased by 10%. The degradation of PVA by ZVI under acidic and aerobic condition was mainly attributed to hydroxyl radicals produced in the Fenton-like reaction.