Abstract
An integrated two-phase anaerobic reactor was designed to treat domestic sewage, and the corresponding start-up process was investigated.In this investigation, the volumetric loading rate ( VLR) of the system was raised by basically maintaining the influent COD ( Chemical Oxygen Demand) concentration and gradually decreasing the hydraulic retention time (HRT) at 35°C，and the start-up process was completed only in the 36 days. When the Influent pH was kept in the range of 7.39 ~ 7.67，the acidogenic phase and the methanogenic phaseof integrated two-phase anaerobic reactor were separated only by using the kinetic method. After completing this process, the reactor operated well with VLR at 1.31 kg / ( m3·d) and HRT at about 7h, and a COD removal of more than 80%,a SS removal of about 90% and a gas production rate of about 0.31L/h were respectively achieved.
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