催化氧化除锰活性滤料去除地下水中双酚A性能

以催化氧化除锰活性滤料(简称活性滤料)为研究对象,考察了地下水中锰污染对于活性滤料去除双酚A效能的影响.结果表明,进水中含有高浓度锰(5mg/L)时,会显著降低活性滤料对于双酚A的去除能力;同时,双酚A也会降低活性滤料对锰的去处能力.双酚A脱附实验结果表明,脱附的双酚A量不足双酚A去除总量的10％,且双酚A去除过程...

Study on the removal of bisphenol A from groundwater by active filter material with manganese removal ability by catalytic oxidation

The effect of manganese pollution in groundwater on the removal efficiency of bisphenol A by the active filter material was investigated. When high concentration of manganese (5mg/L) was contained in the influent, the removal ability of bisphenol A by the active filter material was significantly decreased. At the same time, bisphenol A inhibited manganese removal of the active filter material. The desorption experiment results showed that the desorption amount of bisphenol A accounted for less than 10% of the total bisphenol A removal amount, and the removal rate of total organic carbon (TOC) at the initial stage was maintained at 12%~25%, and then remained at 0.1%~4%, indicating that the adsorption process existed in the removal of bisphenol A, but oxidation was the main removal process. Scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis results showed that the bisphenol A removal would bring the change in microstructure and the formation of new phase. The results of Fourier transform infrared spectroscopy (FTIR) showed that the removal of bisphenol A would consume the hydroxyl groups on the surface of the filter material, resulting in the residual complex on the surface. Finally, three main steps for the removal of bisphenol A by active filter material were proposed, including the adsorption of bisphenol A onto the activated filter material surface to form complexes, the oxidation of bisphenol A via the reaction between the activated filter material and the surface complexes, and the desorption of some reactant intermediates. This study provides theoretical guidance for the application of active filter material in the prevention and controlling of organic pollutant risks in groundwater treatment.