DHS performed fast start up with no aeration and no seed sludge. For 17 days of operational period, the further polished up of COD fraction in mixed wastewater at 20 % was achieved with influent COD concentration of 3,000 mg/l, flow rate at 2.2 liters per day and at HRT 1.5 day. Moreover, by observed results, the odor in the influent was also diminished.