At the beginning (the habituation period), COD and BOD5elimination performance by the HF-MBR was proportionately minimal, and this was because of inadequate biomass growth in the process. The highest COD and BOD5elimination was acquired during the 60–85 day, which is about 81–82% removal. The percentage of COD and BOD5removal during the operation time are shown in Fig. 3a and b. Nevertheless, the concentration of COD and BOD5 was reached to a good low level in the effluent.