Thanks very much for this comment. With a turbulent current and dozens of kilometers in length, this river is located in the mountains of Foshan city. The PPCPs sludge at the bottom of the river never executes removal. Thanks for the suggestion from the reviewer. We will further precipitate the PPCPs sludge before the water treatment plant or excavate the PPCPs sludge from the river and study the effects on drinking water quality. The relevant results will be published in another paper in the future.
The same trend (Figure 2) was mainly due to the stable removal ability of BAC and UF for organics, causing the removal restriction. The periodic backwash (7days) of BAC caused sometimes the dissolved oxygen concentration of BAC-effluent higher than that of raw water. After the gas scrubbing and the hydraulic backwashing, the dissolved oxygen detection of the effluent was carried out, resulting in the above results for dissolved oxygen. Besides, the t-test was used and proved the significant difference between BAC-Effluent and BAC/UF-effluent. Response 6: Thanks very much for this comment.