臭氧及Fenton氧化法处理制浆废水的对比研究

Comparative Study of Ozone Oxidation and Fenton Method for Treatment of Pulp Wastewater

关键词:  制浆废水  臭氧氧化法  Fenton氧化法  深度处理

Key Words:pulping wastewater  ozone oxidation  Fenton oxidation  deep treatment

摘要:本研究以广西某造纸厂制浆出水为研究对象，采用Fenton氧化法及臭氧氧化法进行处理，以色度和COD的去除率为指标，分别对其工艺参数进行了优化，并对比分析了两种方法的去除效果。结果表明，Fenton反应的最佳工艺条件为：初始pH值3，反应时间1.5 h，H₂O₂/Fe²⁺摩尔比3∶1，此时废水色度去除率达97.43%，COD_Cr去除率达92.71%。臭氧氧化反应的最佳工艺条件为：初始pH值8，反应时间20 min，臭氧用量6%，搅拌速度700 r/min，此时废水色度去除率达98.35%，COD_Cr去除率达63.78%。臭氧反应比Fenton反应有更好的色度去除效果，并且有无需调节pH值、无二次污染的优点，处理后的废水可以考虑用于造纸厂的水循环系统中。

Abstract:In this paper， taking the pulp effluent of a paper mill in Guangxi as the research object， the Fenton oxidation method and ozone oxidation method were used for treatment， and the process parameters were optimized with the removal rate of chromaticity and COD_Cr as indicators， and the removal efficiency of the two methods were compared and analyzed. The results showed that the best process conditions for the Fenton reaction were： the initial pH value was 3， the reaction time was 1.5 h， and the H₂O₂/Fe²⁺ molar ratio was 3∶1. The removal rate of chromaticity reached 97.43% and the removal rate of COD_Cr reached 92.71%. The optimum reaction conditions for the ozone oxidation reaction were as follows： the initial pH value was 8， the reaction time was 20 min， the ozone dosage was 6%， and the stirring speed was 700 r/min. The chromaticity removal rate reached 98.35% and the COD_Cr removal rate reached 63.78%. The ozone reaction had better chromaticity removal effect than Fenton reaction， and had the advantages of no pH adjustment and no secondary pollution. The treated wastewater could be considered for the water recycling system of paper mill.