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Development of Bubble Column for Foam Separation
Bando, Yoshiyuki,Kuze, Takahiro,Sugimoto, Tatsuya,Yasuda, Keiji,Nakamura, Masaaki 한국화학공학회 2000 Korean Journal of Chemical Engineering Vol.17 No.5
The foam separation of metal in model wastewater is performed by using two different bubble columns in a continuous operation mode. The equipment and operation conditions are changed, and the foam flow rate and metal concentration in foam flow are measured. The foam flow ratio (the ratio of foam flow rate to the inlet one) increases with increasing gas velocity, with decreasing liquid velocity, with decreasing foam layer height and with decreasing metal concentration in model wastewater. Metal enrichment (the ratio of metal concentration in foam flow to that in inlet flow) shows the reverse tendencies. When a draft tube is inserted in the bubbling layer, the foam flow rate decreases. The enrichment is strongly governed by the foam flow ratio. Since the foam flow ratio is adjusted by means of the equipment and operation conditions, the metal concentration in foam flow is controlled to be a desired value.
Effect of deflected inflow on flows in a stronglycurved 90 degree elbow
Yukiharu Iwamoto,Ryo Kusuzaki,Motosuke Sogo,Kazunori Yasuda,Hidemasa Yamano,Masaaki Tanaka 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.1
Wall pressure measurements and flow visualization were conducted for a 90 degree elbow with an axis curvature radius the same as its inner diameter (125 mm). Reynolds numbers 320,000 and 500,000, based on the inner diameter and bulk velocity, were examined. A deflected inflow, having an almost constant velocity slope and a faster velocity at the inside, was introduced. Ensemble averaged pressure distributions showed that no difference of normalized pressure could be found in both the Reynolds number cases. Power spectral density functions of pressures exhibited that the fluctuation having the Strouhal number (based on the inner diameter and bulk velocity) of 0.6 existed in the downstream region of the elbow, which was 0.1 larger than that of the uniform inflow case [1]. Results of numerical calculations qualitatively coincided with the experimental ones.
Effect of deflected inflow on flows in a strongly-curved 90 degree elbow
Iwamoto, Yukiharu,Kusuzaki, Ryo,Sogo, Motosuke,Yasuda, Kazunori,Yamano, Hidemasa,Tanaka, Masaaki Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.1
Wall pressure measurements and flow visualization were conducted for a 90 degree elbow with an axis curvature radius the same as its inner diameter (125 mm). Reynolds numbers 320,000 and 500,000, based on the inner diameter and bulk velocity, were examined. A deflected inflow, having an almost constant velocity slope and a faster velocity at the inside, was introduced. Ensemble averaged pressure distributions showed that no difference of normalized pressure could be found in both the Reynolds number cases. Power spectral density functions of pressures exhibited that the fluctuation having the Strouhal number (based on the inner diameter and bulk velocity) of 0.6 existed in the downstream region of the elbow, which was 0.1 larger than that of the uniform inflow case [1]. Results of numerical calculations qualitatively coincided with the experimental ones.
Purification and Characterization of Thermostable β-1,3-1,4 Glucanase from Bacillus sp. A8-8
유주순,정수열,이상철,정연주,최용락,이용석,박인혜,김선희,Masaaki Yasuda 한국생물공학회 2007 Biotechnology and Bioprocess Engineering Vol.12 No.3
In this study, the extracellular enzyme activity of Bacillus sp. A8-8 was detected on LB agar plates containing 0.5% of the following substrates: carboxymethylcellulose (CMC), xylan, cellulose, and casein, respectively. The β-1,3-1,4 glucanase produced from Bacillus sp. A8-8 was purified by ammonium sulfate and hydrophobic chromatography. The molecular size of the protein was estimated by SDS-PAGE as approximately 33 kDa. The optimum pH and temperature for the enzyme activity were 6.0 and 60℃, respectiveley. However, enzyme activity was shown over a broad range of pH values and temperatures. The purified β-1,3-1,4 glucanase retained over 70% of its original activity after incubation at 80℃ for 2 h, and showed over 40% of its original activity within the pH range of 9 to 12. This suggests that β-1,3-1,4 glucanase from Bacillus sp. A8-8 is thermostable and alkalistable. In addition, β-1,3-1,4 glucanase had higher substrate specificity to lichenan than to CMC. Finally, the activity of the endoglucanase was inhibited by Fe3+, Mg2+, and Mn2+ ions. However Co2+ and Ca2+ ions were increased its activity.
Purification and Characterization of Thermostable ${\beta}-1,3-1,4$ Glucanase from Bacillus sp. A8-8
Jung, Youn-Ju,Yoo, Ju-Soon,Lee, Yong-Seok,Park, In-Hye,Kim, Sun-Hee,Lee, Sang-Cheol,Yasuda, Masaaki,Chung, Soo-Yeol,Choi, Yong-Lark Korean Society for Biotechnology and Bioengineerin 2007 Biotechnology and Bioprocess Engineering Vol.12 No.3
In this study, the extracellular enzyme activity of Bacillus sp. A8-8 was detected on LB agar plates containing 0.5% of the following substrates: carboxymethylcellulose (CMC), xylan, cellulose, and casein, respectively. The ${\beta}-1,3-1,4$ glucanase produced from Bacillus sp. A8-8 was purified by ammonium sulfate and hydrophobic chromatography. The molecular size of the protein was estimated by SDS-PAGE as approximately 33 kDa. The optimum pH and temperature for the enzyme activity were 6.0 and $60^{\circ}C$, respectiveley. However, enzyme activity was shown over a broad range of pH values and temperatures. The purified ${\beta}-1,3-1,4$ glucanase retained over 70% of its original activity after incubation at $80^{\circ}C$ for 2h, and showed over 40% of its original activity within the pH range of 9 to 12. This suggests that ${\beta}-1,3-1,4$ glucanase from Bacillus sp. A8-8 is thermostable and alkalistable. In addition, ${\beta}-1,3-1,4$ glucanase had higher substrate specificity to lichenan than to CMC. Finally, the activity of the endoglucanase was inhibited by $Fe^{3+},\;Mg^{2+},\;and\;Mn^{2+}$ ions. However $Co^{2+}\;and\;Ca^{2+}$ ions were increased its activity.