Abstract
Preliminary study was done for the two types of wastewater treatment systems: bench-scale combined system of UASB+DHS (upflow anaerobic sludge blanket+downflow hanging sponge) reactor and single DHS reactor. The main objective of this study was to evaluate the prospective combined system of UASB+DHS or single DHS reactor to be applied in Jakarta. The result performance was subsequently compared to the existing intermittent aerobic pond system (IAPS) at the same location. Total COD removal by systems was around 90%, while the IAPS performance achieved only 52%. The organic removal efficiency of the combined system was comparable to that of the single DHS reactor but higher ammonium removal was achieved in the single DHS. Moreover, even though a short hydraulic retention time (HRT) was applied, the treatment performances of both systems were better than that of IAPS in terms of nitrification process. These findings suggest that single DHS reactor can be a viable option for the treatment of domestic wastewater in Jakarta.
