改性陶瓷膜催化 PMS 氧化的二级出水处理特性

In order to obtain high removal efficiency of dissolved organic matter from secondary effluent of wastewater treatment plant, two kinds of highly efficient permeable non-destructive catalytic ceramic membranes (N-C-CM, Fe/N-C-CM) made of carbon-based catalysts (N-C, Fe/N-C) were designed in this study, the in situ activated PMS filtration system using composite catalytic membrane was established, and the optimal operational conditions of composite catalytic membrane were also investigated. The results showed that at the optimal operational conditions (catalyst loading 0.15g, PMS dosage 15 mmol/L and pH 9), the removal efficiency of TOC, color and UV₂₅₄ in secondary effluent were 62.83%, 81.42% and 56.62%, turbidity is 0.00 NTU, respectively using Fe/N-C-CM activated PMS filtration system, which was generally higher than PMS direct oxidation combined with the original ceramic membrane (VCM) filtration and N-C-CM in situ activated PMS filtration system. By comparing the membrane specific flux, membrane fouling resistance distribution and membrane flux recovery rate of the three ceramic membranes after filtration of secondary effluent under the same conditions with or without PMS, it was further confirmed that Fe/N-C-CM in situ activated PMS filtration system can reduce the concentration of pollutants on the membrane surface, thus effectively alleviate membrane fouling. EPR analysis further proved that Fe/N-C-CM in situ activated PMS filtration system produced more SO₄⁻•, •OH and ¹O₂ than PMS direct oxidation combined with VCM filtration and N-C-CM in situ activated PMS filtration system.