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Some Properties of Packed Cage RBC System on the Treatment of Synthetic Domestic Wastewater

The study is concerned with the removal of organic matters in terms of COD from synthetic domestic wastewater by using packed cage RBC system. The packed cage RBC reactor consisted of 2 main components, a 43 liters (working volume) cylindrical reactor and 46.8 cm 3 packed cage drum which was fully packed with I-ball polypropylene media (50 mm in diameter). The total surface area of I-ball polypropylene media in packed cage drum was 7.12 M 2. The synthetic domestic wastewater used in this experiment contained glucose (carbon source) and urea (nitrogen sorce) as the main components. Synthetic domestic wastewater, was used in this study, with initial COD concentrations of 100, 200, 300 and 400 mg/L, respectively. The reactor was operated under various hydraulic retention times (HRT) of 4, 6 and 8 hrs. The results show that COD removal efficiency decreased when the organic loading was increased of HRT was decreased. At the highest Arial organic loading of 14.49 g COD/M 2-day and lowest HRT of 4hrs, the total and soluble COD removal efficiencies were 77.36% and 84.82%, respectively. On the other hand, the total and soluble COD removal efficiencies were 80.24% and 92.44%, respectively at lowest Arial organic loading of 3.62 gCOD/M 2-day and highest HRT of 8 hrs. The dissolved oxygen in the reactor decreased when organic loading was decreased or HRT was increased. For example, at highest Arial organic loading (14.49 mg/L), the rotating drum could supply enough oxygen (the dissolved oxygen of mixed liquor in the reactor was 3.9 mg/L) to the system. The concentration of suspended solids of effluent was increased when the organic loading was increased when the organic loading was increased or HRT was decreased. Because part of the bio-film came loose from the surface of packed cage drum and media. At the highest Arial organic loading (14.49 mgCOD/M 2-day) and lowest HRT (4 hrs), the suspended solids of effluent was 28 mg/1. But the suspended solid was 8 mg/L at the lowest organic loading (3.62 mgCOD/M 2-day) and highest HRT (8 hrs). From all of the results above, we believe that the packed cage RBC system might be the best system for treating domestic wastewater due to the reduction of the energy consumption and stabilization of the DOD removal efficiencies under unstable COD loading and hydraulic loading. And also, it could solve the problem of suspended solids in the effluents.