Thanks for the reviewer’s helpful suggestion. The objective statement has been added to the abstract to support the seriousness of the problem, and the revised sentences are as follows: Biological activated carbon (BAC) biofilter coupling ultrafiltration (UF) is a promising process for the treatment of river water contaminated by pharmaceutical and personal care products (PPCPs). However, the pilot-scale study should be conducted to reveal the long-term removal performance and the respective contributions of BAC and UF.
The title seems good, but the abstract seems to be fine. Please add one problem statement line in abstract to justify this sentence ``the long-term pilot-scale study is urged to be investigated.``.