• Journal of Korean Society of Water and Wastewater
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• v.21 no.1
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• pp.57-63
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• 2007

In this study, the cone type baffle (CTB) was developed to improve the flow distribution in an upflow bioreactor. It was composed of two different zones (anoxic and oxic) by inserting the CTB in the middle of the bioreactor. Based on the results of the dye tracer tests, hydraulic retention time (HRT) for the anoxic, oxic and total volume of the bioreactor was found to be 0.998, 1.996 and 2.994 hr, respectively. And the theoretical HRT for each volume was 1.0, 2.0 and 3.0 hr, respectively. The values of HRT obtained from the tests coincide with theoretical values. Therefore, the flow pattern for each zone inside the bioreactor, which was divided by the CTB, was dominated by complete mix flow rather than plug flow. Based on the results of the transection measurements, the DO concentration for each zone inside the bioreactor was clearly distinguished. Consequently, the CTB played an important role in the separation of anoxic and oxic zones. Also, the each pollutans were reduced gradually along the height in the oxic zone. The reason is that the biomass in the media layer (Port 4 and 5) was higher than that in the mixed liquor layer without the media (Port 2 and 3).

• Journal of Korean Society of Water and Wastewater
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• v.21 no.1
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• pp.47-55
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• 2007

The waste water treatment facility at rural and mountainous region in catchment areas of dams should be small scale. The wastewater treatment facility of small scale has some specification as follows;1)simple process, 2)low maintenance cost, and 3)high removal efficiency. So, we developed the bioreactor which can be satisfied with the specification of small scale waste water treatment facility. The bioreactor consisted of the anoxic and oxic zone. The two zones were effectively separated by cone type baffle. By the effective separation through CTB, the nitrification and denitrification reaction occurred effectively. Therefore, the removal efficiency of total nitorgen (TN) increased compared to other types of baffle. And, we put into the bio activated media in oxic zone to increase the concentration and activity of microbiology. The media contained the components which were made of many kinds of the minerals to increase the activity of microbiology. Additionally, we observed that the phosphate removal efficiency increased by bio activated media. This is resulted from the coagulation-sedimentation reaction by mineral in components. The average removal efficiencies of TN and TP during Run 2 were 69 and 89% which were 4 and 25% higher than those during Run 1 without the MA, respectively. For BOD, COD, SS and TKN, the average removal efficiencies at Run 2 were slightly higher than those at Run 1. Therefore, we could maintain the high concentration and high activity of microbiology through bioreactor developed in this study. And the removal efficiency of TN and TP increased.