Abstract
The effects of interruption of wastewater inflow on the performance of rotating biological contactor processes (RBC) were studied using laboratory scale RBC processes. The processes used in this study were placed in temperature controlled rooms of 10°Cand 20°C. The processes were operated with hydraulic loading of 53l·m-2·d-1 and BOD loading of 8.0g·m-2·d-1.
The following results were obtained.
1) Immediately after the reintroduction of wastewater, effluent COD values increased up to about 27mg·l-1 and about 35mg·l-1 for 3 days and 7days interruption, respectively. However, the effluent COD values decreased to the same level as that before the interruption (COD =1020mg·l-1) within one day. Little difference was observed between operations under 10°C and 20°C.
2) The increase in the effluent COD was estimated to be caused by decomposition and dissolution of microbial film during the interruption. However, organic removal efficiency of microbial film was not decreased during the interruption of wastewater inflow for several days.
