This study investigates whether the effluent with
highly variable influent quality, which is treated by the AS/CA
process with 8hr HRT, would comply with the regulation
standards. The removal of O&G and true color, the stability of
the system, and the growth of microbes in the different reaction
tanks are also examined. The results are then compared to
those obtained using a conventional single activated sludge
system and a conventional single contact aeration system.
These three, AS, CA or AS/CA systems were under the same
operating condition as follows: (1) HRT: 8hr; (2) Sludge recycle
rate: 30%, and (3) Influent substrates.