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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.
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이준호, 김명호, 고대현 韓國交通大學校 2020 한국교통대학교 논문집 Vol.55 No.-
In this study, we tried to find an efficient coagulation agent by comparing and analyzing the coagulation properties of each coagulation agent by conducting a Jar-test on various coagulation agents used for the efficient treatment of high turbidity construction wastewater. The Jar test was conducted with wastewater with a turbidity of 1,150 NTU and SS 1500 mg/L using yellow soil. PACS-2, PACSS, PACSM, PACS300, Chitosan, and Alum were tested in Jar-test and the turbidity, pH, SS, standing analysis, filtration time, etc. were analyzed to compare the cohesive characteristics of each floc. PACS-2 ranges from turbidity 36.9~124 NTU (average 82.24 NTU), pH 6.934~7.100 (average 7.025) and SS 20~70 mg/L (average 45.2 mg/L). PACSS appeared to range from turbidity 6.59~59.3 NTU (average 21.29 NTU), pH 5.166~7.010 (average 6.331), and SS 6~28 mg/L (average 13.6 mg/L). Also PACSM was found to range from turbidity 4.16~94 NTU (average 35.18 NTU), pH 5.742~6.908 (average 6.582), and SS 4~118 g/L (average 34 mg/L). PACS300 ranged from turbidity 5.22~85.7 NTU (average 31.07 NTU), pH 5.968~6.875 (average 6.603) and SS 4~66 mg/L (19.6 mg/L on average). Chitosan was found to be in the range of turbidity 7.3~50.1 NTU (19.58 NTU on average), pH 6.738~7.097 (6.900 on average), and SS 4~32 mg/L (13.6 mg/L on average). Finally, the Alum was found to range from turbidity 22~217 NTU (average 132.72 NTU), pH 6.878~7.113 (average 6.984), and SS 22~224 mg/L (average 115.2 mg/L). As a result of the experiment, Chitosan is considered to have a high coagulation characteristics as a coagulation agent of high turbidity construction wastewater due to low change in pH and excellent coagulation characteristics.
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