studied the effects
of temperature and HRT on the treatment of low-strength dairy
wastewater (0.2–0.5 g COD L−1) in an AFBR. They reported that
reducing temperature from 35 ◦C to 20 ◦C decreased COD removal
efficiency between 10 and 25%; however, the reactor performance
gradually increased with the increasing of HRT from 0.083 to
0.33 d