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CFD 활용한 Airlift SBR내 유동담체 유동장 해석
고대현 ( Dai-hyeon Go ),송대현 ( Dae-hyun Song ),이준호 ( Jun-ho Lee ) 한국환경기술학회 2023 한국환경기술학회지 Vol.24 No.1
In the SBR with biofilm carrier system, proper sloughing of the biofilm is necessary to maintain aerobic conditions and pore space. The purpose of this study is to visualize the flow field according to the operation time by using the Realizable k-model of the CFD program to sloughing and recirculate the biofilm carrier biofilm in the React mode in the SBR device equipped with an airlift pump. As a result of creating the grid, the range of element quality is 0.50703~0.99947, the average is 0.98618, and the average surface area is 0.73257 m<sup>2</sup>. The boundary condition for Realizable κ-ε, Standard Wall Functions model, and the turbulence model factors, C<sub>2</sub> are set to 1.9, the TKE Prandtl Number to 1, and the TDR Prandtl Number to 1.2. The aeration velocity at the bottom of the SBR was fixed at 0.25 m/sec, and the flow rate of the airlift pump inlet was set at 0.5 m/sec, 1 m/sec, and 2 m/sec, and compared the change in flowfield with aeration time. As a result of air volume for the contour, it can be seen that the time for the water to reach the surface of the water gradually decreased as the air flow rate of the airlift increased. After 1.8 sec, the flow of air seems to be the same even if the intensity of the air increases. As a result of velocity u for vector, the intensity of velocity u of SBR increased as the flow rate of airlift increased. When the inlet air velocity of the airlift pump is over 1.0 m/s, it is concluded that the overgrown biofilm on the biofilm carrier will be sloughing and recycled.