两种活性染料废水的光催化氧化处理及回用研究

Study of Treating Dyeing Wastewater of Two Reactive Dye by Photo Catalysis and Oxidation and Reusing

在光催化氧化剂DC—1存在条件下,利用光化学方法对某针织厂活性染料染色废水进行处理,并考察温度、染料浓度、光照时间等因素的影响。结果表明,染料浓度越低、反应时间越长、温度越高越有利于光催化降解的进行,且出水应用于染色后皂洗、水洗效果与常规工艺无异。染料的降解机理可能为首先是分子中发色基团被破坏,形成无色有机中间产物,表现为溶液色度的下降较快,随后才是中间产物的降解过程,苯环、萘环等键能较高部位继续破坏,染料从大分子结构逐步变为小分子结构并最终矿化。

In the existence of photo catalyst and oxidant DC—1,we used the method of photo chemistry to treat dyeing wastewater from a knitting mill. Influence of reaction temperature, concentration of dye and photo irradiate time were explicitly investigated. It showed that it was easier to photo catalysis degradation when dye concentration was lower, reaction time was longer and temperature was higher, and the drain off water could be reused for soaping and washing after dyeing. Dye degradation mechanism could be that chromophore of molecule was destroyed firstly ,and formed colorless organic mid-productions. Then organic mid-productions were be degraded, positions of higher bond energy such as phenyl or naphthyl were destroyed, and dye was degraded from big molecule to small molecule and was mineralized finally.