高级氧化工艺处理聚乙烯醇废水研究

Research of Advanced Oxidation Process for the Treatment of Polyvinyl Alcohol Wastewater

聚乙烯醇(PVA)因其良好水溶性及环境友好特性已被广泛应用于工业生产中,但PVA属于典型的难降解有机物,且PVA废水化学需氧量值较高,必须进行处理才能达标排放。针对聚乙烯醇废水的处理主要包括生物、物理和化学方法。其中高级氧化工艺(AOPs)作为一种很有前途的处理含难降解有机污染物废水的技术已经被广泛用于处理PVA废水。根据引发自由基产生的物质,将AOPs分为以下3类:(1)高活性催化剂引发氧化类;(2)外加能源引发氧化类;(3)杂化引发氧化类。文章探讨了各方法氧化降解效率及优缺点,并介绍了各个方法的机理,提出了现有处理工艺中存在的问题,探讨了解决的思路,为PVA废水处理技术的发展提供参考。

Polyvinyl alcohol(PVA) has been widely used in industrial production due to its good water solubility and environmentally friendly properties, but PVA is a typical refractory organic matter with poor biodegradability with a high chemical oxygen demand value and must be treated before it can be discharged. The treatment of PVA-containing wastewater mainly includes biological, physical and chemical methods. Among them, advanced oxidation processes(AOPs), as a promising technology for treating wastewater containing refractory organic pollutants, have been widely used to treat PVAcontaining wastewater. According to the substances that initiate the generation of free radicals, AOPs are divided into the following three categories:(1) highly active catalysts to initiate oxidation;(2) external energy sources to initiate oxidation;(3) hybridization to initiate oxidation. The oxidative degradation efficiency, advantages and disadvantages of each method are discussed, and the mechanism of each method is introduced. Additionally, the problems in the existing treatment process are put forward, and the solution ideas are discussed, so as to provide a reference for the development of PVA wastewater treatment technology.