• Title/Summary/Keyword: Bubble Column

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Effect of Inorganic Salts and Various Bioreactors on the Production of Clavulanic Acid (무기염과 생물반응기의 종류가 Clavulanic acid의 생산에 미치는 영향)

  • Kim, Il-Chul;Kim, Seung-Uk
    • KSBB Journal
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    • v.14 no.4
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    • pp.440-444
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    • 1999
  • For the effecient production of clavulanic acid., a mutant strain Streptomyces clavuligerus KK was selected from Streptomyces clavuligerus ATCC 27064 through mutation with NTG. S. clavuligerus ATCC 27064 produced about 200 mg/L of calvulanic acid when the medium was composed of 1%(W/V) glycerol, 1.5%(W/V) soybean flour, 0.1%(W/V) $KH_2PO_4$, 0.2%(V/V) soybean oil. A selected mutant, S. clavuligerus KK, produced about 1150 mg/L of clavulanic acid in the same medium. After the addition of $MgSO_4$ to the basal medium, S. clavuligerus KK produced about 1550 mg/L of clavulanic acid, with shows about 1.3 times higher than that produced in the basal medium. In order to select the proper bioreactor for the production of clavulanic acid, a batch culture was performed in an airlift, a bubble column and an stirred tank bioreactors. In an airlift bioreactor, about 1350 mg/L of clavulanic acid was produced, in a bubble column bioreactor, about 1550 mg/L, in a stirred tank bioreactor, about 2200 mg/L, respectively. The production of clavulanic acid in stirred tank bioreactor was about 50% higer than that by an airlift and a bubble column bioreactors. According to this result, the stirred tank bioreactor was selected as a proper bioreactor.

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Effects of Operating Variables on the Conversion of Meta Boric Acid Formation in a Bubble Column Reactor (기포탑 반응기에서 조작변수가 meta 붕산 생성반응 전환율에 미치는 영향)

  • Cho, Soo-Haeng;Do, Jae-Bum;Kang, Y.
    • Applied Chemistry for Engineering
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    • v.7 no.3
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    • pp.573-579
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    • 1996
  • Effects of operating variables on the conversion of the formation reaction of meta boric acid from ortho boric acid in a laboratory-scale bubble column reactor were investigated to obtain the basic data which are indispensable for the design, scale-up, control, development and operation of industrial bubble column reactors. Reaction time and pressure, particle size of reactant and gas flow rate were chosen as experimental variables. Effects of the experimental variables on the gas holdup in the bubble column reactor were also discussed in relation to the conversion of reaction. From the results of this study, the optimum conditions were drawn as follows : Reaction time ; 35~40(min), reaction pressure ; 92~95(kPa), particle size ; under $0.6{\times}10^{-3}(m)$, gas flow rate ; 0.07~0.08(m/s).

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Development of a Novel Bioreactor System for the Treatment of Gaseous Benzene

  • Yeom, Sung-Ho;Daugulis, Andrew J.;Yoo, Young-Je
    • 한국생물공학회:학술대회논문집
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    • pp.73-76
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    • 2000
  • A novel, continuous bioreactor system combining a bubble column (absorption section) and a two-phase bioreactor (degradation section) has been designed to treat a gas stream containing benzene. The bubble column contained hexadecane as an absorbent for benzene, and was systemically chosen considering physical, biological, environmental, operational and economic factors. This solvent has infinite solubility for benzene and very low volatility. After absorbing benzene in the bubble column, the hexadecane served as the organic phase of the two-phase partitioning bioreactor, transferring benzene into the aqueous phase where it was degraded by Alcaligenes xylosoxidans Y234. The hexadecane was then continuously recirculated back to the absorber section for the removal of additional benzene. All mass transfer and biodegradation characteristics in this system were investigated prior to operation of the integrated unit, and these included: the mass transfer rate of benzene in the absorption column, the mass transfer rate of benzene from the organic phase into the aqueous phase in the two-phase bioreactor, the stripping rate of benzene out of the two-phase bioreactor, etc. All of these parameters were incorporated into model equations, which were used to investigate the effects of operating conditions on the performance of the system. Several experiments were conducted to show the feasibility of this system. This process is believed to be very practical for the treatment of high concentrations of gaseous pollutants.

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Study on Effect of gas superficial velocity on particle behavior in three phased Slurry Bubble Column Reactor (3상 Slurry Bubble Column Reactor에서 기체유속에 따른 고체입자의 거동에 대한 연구)

  • Yang, Jung-Hoon;Yang, Jung-Il;Lee, Ho-Tae;Kim, Hak-Joo;Chun, Dong-Hyun;Jung, Heon
    • 한국신재생에너지학회:학술대회논문집
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    • pp.876-879
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    • 2009
  • Fischer-Tropsch 합성 반응과 같은 slurry bubble column reactor에서는 반응 속도를 증진시키기 위해서는 서로 다른 상간의 접촉 면적을 최대화함으로써 물질 전달을 원활하게 유지하여야 한다. 특히 Fischer-Tropsch 합성 반응에서는 반응물인 기체가 촉매로서 기능하는 고체 표면으로의 external mass transfer가 효과적으로 이루어져야 하기 때문에 반응기 내의 기체의 거동뿐만 아니라 고체인 촉매의 분포에 대한 연구가 활발하게 이루어지고 있다. 따라서 본 연구에서는 반응기 내에 기체의 superficial velocity를 변화시키면서 기체의 hold up 뿐만 아니라 고체 입자의 분포특성에 대하여 관찰하였다. Superficial velocity가 증가함에따라 gas hold up의 경우, 일정하게 증가하다가 6 cm/sec 이상에서 그 증가폭이 감소하였다. 즉 6 cm/sec이상에서 turbulent flow regime을 형성하였다. 또한 고체입자의 분포 역시 기체의 superficial velocity가 증가함에따라 보다 균일하게 되는 것을 확인할 수 있었다.

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Analysis of Acoustic Back Scattering from Bubble Columns in Water (수중 기포기둥에 의한 음파의 후방 산란특성 분석)

  • Park, K.-J.;Yoon, S.-W.;Roy, R.A.
    • The Journal of the Acoustical Society of Korea
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    • v.10 no.2
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    • pp.36-43
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    • 1991
  • Acoustic backscattering from a buble column in water was studied theoretically and experimentally. For theoretical analysis a general scattering theory was used by assuming the bubble column to be lumped element scatterer which can be characterized by its shape, void fraction and dimensions. When the void fraction is less than 1% and the incident frequency is higher than individual bubble resonance frequencies, the experimental results show that the acoustic backscattering from a bubble column depends mainly on the void fraction rather than the individual bubble sizes. It was also theoretically and experimentally observed that the acoustic backscattering levels were increased and their peaks moved to the lower frequency regin by raising the void fraction of bubble column.

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Utilization of CFD Simulation Model for a Bubble Column Photobioreactor (버블 칼럼 광생물반응기의 내부 유동분석을 위한 전산유체역학 시뮬레이션 모델의 이용)

  • Yoo, J.I.;Lee, I.B.;Hwang, H.S.;Hong, S.W.;Seo, I.H.;Bitog, J.P.;Kwon, K.S.;Kim, Y.H.
    • Journal of The Korean Society of Agricultural Engineers
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    • v.51 no.5
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    • pp.1-8
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    • 2009
  • Photobioreactor (PBR) that houses and cultivates microalgae providing a suitable environment for its growth, such as light, nutrients, CO2, heat, etc. is now getting more popular in the last decade. Among the many types of PBRs, the bubble column type is very attractive because of its simple construction and easy operation. However, despite the availability of these PBRs, only a few of them can be practically used for mass production. Many limitations still holdback their use especially during their scale-up. To enlarge the culture volume and productivity while supplying optimum environmental conditions, various PBR structures and process control are needed to be investigated. In this study, computational fluid dynamics (CFD) was economically used to design a bubble-column type PBR taking the place of field experiments. CFD is a promising technique which can simulate the growth and production of microalgae in the PBR. To study bubble column PBR with CFD, the most important factor is the possibility of realizing bubble. In this study, multi-phase models which are generally used to realize bubbles were compared by theoretical approaches and comparing in a 2D simulation. As a result, the VOF (volume of fluid) model was found to be the most effective model to realize the bubbles shape as well as the flow inside PBR which may be induced by bubble injection. Considering the accuracy and economical efficiency, 0.005 second time step size was chosen for 2.5 mm mesh size. These results will be used as criteria for scale-up in the PBR simulation.

Fractional gas hold-up in trayed bubble column (Trayed 기포탑 반응기에서 높이에 따른 기포입자의 거동분석)

  • Yang, Jung Hoon;Hur, Young Gul;Yang, Jung-Il;Kim, Hak-Joo;Chun, Dong Hyun;Kim, Byung Kwon;Lee, Ho-Tae;Jung, Heon
    • 한국신재생에너지학회:학술대회논문집
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    • pp.77.1-77.1
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    • 2011
  • 슬러리 기포탑 반응기는 열 및 물질 전달의 용이성, 낮은 운전비용 및 장치의 간단성의 장점을 가지고 있어서 Fischer-Tropsch 반응, bio-reaction 등에 많이 응용되고 있다. 특히, 반응물은 기체 상태로 반응기에 투입이 되는데, 이 기포입자의 상승하는 힘을 바탕으로 기상/액상/고상이 균일하게 혼합되게 된다. 많은 연구자들이 이러한 기포탑 반응기의 성능을 개선하고자, 다양한 반응기 디자인에 대하여 보고하고 있다. 특히 반응기 내부에 tray를 설치함으로써, 기포 포집율을 증진시기고 액상의 역류를 최소화시키는 연구가 활발히 진행되고 있다. 본 연구에서는, 다양한 기공크기를 갖는 tray를 활용함으로써 높이에 따른 기포 포집율의 변화 및 반응기 내에 기포 입자의 거동 특성에 대하여 살펴보았다.

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Production of 1,3-Dihydroxyacetone from Glycerol by Gluconobacter oxydans ZJB09112

  • Hu, Zhong-Ce;Liu, Zhi-Qiang;Zheng, Yu-Guo;Shen, Yin-Chu
    • Journal of Microbiology and Biotechnology
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    • v.20 no.2
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    • pp.340-345
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    • 2010
  • The culture variables were optimized to increase 1,3-dihydroxyacetone (DHA) production by Gluconohacter oxydans ZJB09112 in shake flasks and bubble column bioreactors. After fermentation in the optimized medium (g/l: yeast extract 5, glycerol 2.5, mannitol 22.5, $K_2HPO_4$ 0.5, $KH_2PO_4$ 0.5, $MgSO_4{\cdot}7H_2O$ 0.1, $CaCO_3$ 2.0, pH 5.0), when five times of glycerol feeding were applied, $161.9{\pm}5.9\;g/l$ of DHA was attained at a $88.7{\pm}3.2%$ conversion rate of glycerol to DHA.