Abstract: After more than 20 years of exploration, a petrochemical enterprise has gradually formed a sewage reuse process with "BAF (Biological Aerated Filter) + MMF (Multi-media Filter) + UF (Ultrafiltration) + RO (Reverse Osmosis)" as the core. Some problems occur in different processes during the application of sewage reuse, and corresponding measures and suggestions have been proposed to address these issues. For the stable operation of newly built sewage reuse devices, it is recommended to use mature processes or new processes that have undergone sufficient on-site testing and verification as the core process.

Key words: biological aerated filter/BAF, multi-media filter/MMF, ultrafiltration/UF, reverse osmosis/RO