Abstract:

At present, bisphenol A (BPA) has been found to exist in a variety of water environments, seriously affecting the safety of drinking water. In order to solve this problem, a new technology for removing BPA from water by using potassium ferrate (K₂FeO₄) to strengthen iron manganese oxide film (MeO _x ) was proposed. The removal effect and influencing factors of BPA by K₂FeO₄ enhanced filtration were studied, the sustained stability of BPA removal effect in long-term operation experiments was explored, and the microscopic mechanism of BPA removal by K₂FeO₄ enhanced MeO _x filtration was analyzed. Adding 0.02mg/L K₂FeO₄ in the influent increased the removal efficiency of BPA from 20% to about 70% in a pilot-scale filter system. In the long-term removal experiment of BPA, after the activity of the oxidation film decreased, the dosage of 1.0mg/L Mn²⁺ in the influent was used to gradually restore the activity of the oxide film, thus maintaining the effective removal of BPA. The pH in the range of 6.54 to 8.52 had less effect on the removal of BPA. The increase in the concentration of NH{}_{\mathrm{4}}^{+} would lead to a decrease in the removal efficiency of BPA. The benzene ring in BPA decomposed to form 􀰶CH₂CH(OH)􀰹 _n and CH₃CH₂CHO during the removal process of BPA, and that K₂FeO₄ oxidized Mn and MnO in the oxide film to high-valent MnO₂ and Mn₂O₃, which helped to improve the activity of MeO _x . The study would provide a new idea for the effective removal of BPA from water.

Key words: potassium ferrate, enhanced filtration, iron manganese oxide film (MeO _x ), bisphenol A

摘要：

目前双酚A（BPA）已被发现存在于多种水环境中，严重影响饮水安全。为了解决这一问题，本文提出了一种高铁酸钾（K₂FeO₄）强化铁锰氧化膜（MeO _x ）去除水中BPA的新技术。研究了K₂FeO₄强化过滤对BPA的去除效果以及影响因素，探究了长期运行实验中BPA去除效果的持续稳定性，并深入分析了K₂FeO₄强化铁锰氧化膜过滤去除BPA的微观作用机理。在中试系统进水中投加0.02mg/L的K₂FeO₄，可将BPA的去除效率由原来的20%提高至约70%。在BPA的长期去除实验中，氧化膜活性降低后可向进水中投加1.0mg/L的Mn²⁺恢复其活性，从而维持中试系统对于BPA的有效去除。pH在6.54~8.52范围内，对于BPA的去除影响较小，NH{}_{\mathrm{4}}^{+}浓度的增加会导致BPA的去除效率明显下降。在去除BPA的过程中，BPA中的苯环分解生成􀰶CH₂CH(OH)􀰹 _n 和CH₃CH₂CHO，且K₂FeO₄将铁锰氧化物膜中的Mn和MnO氧化为高价MnO₂和Mn₂O₃，有助于提高氧化膜活性。本文将为有效去除水中BPA提供新的思路。

关键词: 高铁酸钾, 强化过滤, 铁锰氧化膜, 双酚A