In this study, the PVDF/nTiO2-(n-1)Fe(OH)3 modified membrane was prepared by the layer-by-layer self-assembly method, and it was applied in the moving bed-ultraviolet photocatalytic membrane bioreactor (MB-UVPMBR) system. The results demonstrate that the modified PVDF/6TiO2-5Fe(OH)3 membrane exhibits excellent hydrophilicity, with the water contact angle reduced to 26°. The pure water flux reaches a maximum of 551.65 L·m− 2·h− 1. Sludge bulking is effectively suppressed, enhancing anti-fouling performance. The initial transmembrane pressure (TMP) value is lower than that of the original membrane, while photocatalytic degradation capability is improved. Within the MB-UVPMBR system, this modified membrane significantly enhances removal rates for total organic carbon (TOC) and chemical oxygen demand (COD) - achieving 96.66% and 94.13% respectively - and markedly delays membrane fouling. The cleaning cycle is extended by 2.74 times compared to conventional polyvinylidene fluoride (PVDF) membranes. This study provides a viable technical pathway for the efficient treatment and reuse of domestic wastewater in backfilling operations, holding significant importance for reducing mine backfilling costs and achieving water resource recycling.
Zhang et al. (Sat,) studied this question.