• Title/Summary/Keyword: Packed Bed

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Removal of Total Phosphate by Bipolar Packed Bed Electrolytic Cell (충전복극전해조에 의한 총 인 제거)

  • Kim, Eun-Hee;Park, Seung-Cho
    • Applied Chemistry for Engineering
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    • v.19 no.4
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    • pp.366-369
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    • 2008
  • To evaluate the performance of a bipolar packed bed cell (BPBC) filled with granular aluminium, the experiments were carried out in two groups as batch and continuous processes. In a batch process, removal efficiency of total phosphate (T-P) was 88% in case of electrolytic treatment of phosphate solution, T-P 10 mg/L at 6 V during 3 h by BPBC filled with granular aluminium. In a continuous process, residual T-P concentration was about 2 mg/L in case of electrolytic treatment of phosphate solution, 10 mg/L at 6 V, HRT 3 h by BPBC filled with granular aluminium. Break-through point was observed after running for 120 h at hydraulic retention time (HRT) of 3 h.

A STUDY ON INDUSTRIAL GAMMA RAY CT WITH A SINGLE SOURCE-DETECTOR PAIR

  • Kim Jong-Bum;Jung Sung-Hee;Kim Jin-Sup
    • Nuclear Engineering and Technology
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    • v.38 no.4
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    • pp.383-390
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    • 2006
  • Having its roots in medical applications, industrial gamma ray CT has opened up new roads far investigating and modeling industrial processes. Using a line of research related to industrial gamma ray CT, the authors set up a system of single source and detector gamma transmission tomography for wood timber and a packed bed phantom. The hardware of the CT system consists of two servo motors, a data logger, a computer, a radiation source and a radiation detector. One motor simultaneously moves the source and the detector for a parallel beam scanning, whereas the other motor rotates the scan table at a preset projection angle. The image is reconstructed from the measured projections by the filtered back projection method. The phantom was designed to simulate a cross section of a packed bed with a void. The radiation source was 20mCi of Cs-137 and the detector was a 1 inch $\times$ 1 inch NaI (TI) scintillator shielded by a lead collimator. The experimental gamma ray CT image has sufficient resolution to reveal air holes and the density distribution inside the phantom. The system could possibly be applied to a packed bed column or a pipe flow in a petrochemical plant.

Rate Enhancement of Thermal Decomposition Reaction in the $Ca(OH)_2$ Packed Bed ($Ca(OH)_2$ 충전층의 열분해 반응 촉진)

  • Chung, Soo-Yull;Kim, Do-Wan;Kim, Jong-Shik
    • Solar Energy
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    • v.15 no.1
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    • pp.73-84
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    • 1995
  • The present paper is on the utilization of a thermal decomposition reaction $Ca(OH)_2=CaO+H_2O$, for thermal energy storage. One of the important problems in this case is how to heat up and decompose the particle of $Ca(OH)_2$ effectively where the thermal conduction is poor. In this study, the effects of Cu-plates which are placed in the $Ca(OH)_2$ packed bed as heat transfer fins are investigated experimentally. The results show that the Cu-plates are very effective for heat transfer and the thermal decomposition in the $Ca(OH)_2$ packed bed. The amount of time to dehydrate took less than a half than that without fins under the conditions of this study.

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Studies on the Heat Transfer Characteristics of Citrus Fruits (I) On the Cooling Process of Packed Bed of Citrus Unshu (감귤의 열전달 특성에 관한 연구 - (I) 온주밀감충전층의 냉각과정에 대하여 -)

  • Hur Jong-Wha;Kim Suk-Hyun
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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    • v.7 no.2
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    • pp.80-86
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    • 1978
  • The distribution of temperature obtained by the solution of Schumann equation and that of experimentally obtained on tile cooling process of packed bed of citrus unshu show a good agreement, and the maximum deviation is only $1-2^{\circ}C$. The agreement means that it is possible to apply the Schumann model to the cooling process of packed bed of citrus unshu. In considering respiration heat, the numberical result by the solution of the equation is that in case of the velocity of gas $(3^{\circ}C)$ is above 1m/sec, becomes below 0.01 and effect of respiration heat is negligible and in case of below 1m/sec the velocity of gas $(3^{\circ}C)$ is above 0.01 and the effect of respiration heat must be consideied. We Present the Practically easily applicable figure of cooling characteristic line on the both . cases of short term cooling Process and long time storage of citrus unshu.

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Effects of the Recirculation Port Location on Treatment Efficiency of an Anaerobic Hybrid Reactor Consisted of a Fluidized Bed and a Packed Bed (유동상과 충전상이 결합된 혐기성 혼성 반응조에서 순환수의 인출지점이 처리효율에 미치는 영향)

  • Kim, Seong-Yong;Park, Soo-Young;Cho, Kwang-Myeung
    • Journal of Korean Society of Environmental Engineers
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    • v.22 no.11
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    • pp.1935-1944
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    • 2000
  • This research was performed to investigate the effects of the location of recirculation port on the wastewater treatment efficiency of an anaerobic hybrid reactor consisted of a fluidized bed and a packed bed. The recirculation port was located either at the top of the packed bed (Reactor 2) or above the fluidized bed (Reactor 1). Media for the fluidized bed and the packed bed were granular activated carbon and Pall ring-type plastic media. respectively. At organic loading rates(OLR) up to $6.2kg\;COD/m^3-day$. Reactor 2 showed somewhat better performance than Reactor 1 with COD removal efficiencies of 85.0-95.2%. The COD removal efficiencies of the reactors drastically deteriorated at OLRs above $6.2kg\;COD/m^3-day$, and the tendency was more severe for Reactor 1 than for Reactor 2. Eventhough the two reactors showed similar effluent SS concentrations at OLRs below $3.6kg\;COD/m^3-day$, Reactor 2 showed higher effluent SS concentrations than Reactor 1 at OLRs above $5.3kg\;COD/m^3-day$. Reactor 2 was stabler than Reactor 1 with a methane production rate of $5.5kg\;COD/m^3$-day at the OLR of $13.3kg\;COD/m^3-day$. An abrupt increase in effluent volatile acid concentration was observed at the OLR of $6.2kg\;COD/m^3-day$ for Reactor 1 and $7.1kg\;COD/m^3-day$ for Reactor 2. and the increase was greater in Reactor 1. In conclusion. the range of OLR for adequate treatment in the hybrid reactor was determined according to the location of the internal recirculation port. It is more desirable for higher OLRs to locate the recirculation port at the top of the packed bed in order to utilize the whole volume of the reactor.

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A comparative study of dyeing wastewater treatment capability for Aerobic Packed/Fluidized-Bed and Moving Media Complete Mixing Activated Sludge system (염색폐수 처리성능에 대한 호기성 고정 및 유동층 생물막공법과 회전매체를 가진 완전혼합 활성슬러지 공법의 비교연구)

  • 김홍태;김규창
    • Journal of Environmental Science International
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    • v.8 no.4
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    • pp.525-532
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    • 1999
  • This study was conducted to evaluate capability of dyeing wastewater treatment for 3 type reactors. These reactors were Packed Bed Reactor(PBR), Fluidized Bed reactor(FBR) and Moving Media Complete Mixing Activated Sludge reactor(MMCMAS). Experiments of PBR and FBR were performed by various packing ratios and organic loading rates, experiments of MMCMAS were performed by various organic loading rates. In order to obtain ${SBOD}_5$ removal efficiencies of more than 90%, the F/Mv ratios of PBR, FBR, MMCMAS were 0.11 kgBOD/kgMLVSS$\cdot$d, 0.12 kgBOD/kgMLVSS$\cdot$d, and 0.37 kgBOD/kgMLSS$\cdot$d, respectively. So MMCMAS system which has more active microorganisms showed better capability of organic removal and also stronger dynamic and shock loadings than those of PBR and FBR. In PBR and FBR, the media packing ratio of 20% showed better performance of organic matters removal effciencies than 10% and 30%, but sludge production rate at media packing ratio of 30% was relatively lower than that of 10% and 20%. When more than 90% organic matters removal efficiency was obtained, the ratios of attached biomass to total biomass at PBR, FBR, MMCMAS were 89~99%, 87~98%, and 54~80%, respectively. The ratio of attached biomass to total biomass was low in MMCMAS. This was formation of thin biofilm due to shear force between rotaing disc and water. The average sludge production rates(kgVSS/kgBODrem.) of PBR, FBR and MMCMAS were 0.20, 0.29 and 0.54, respectively.

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Simulation for Possible Coke-Free Operation of a Packed Catalyst Bed Reactor in the Steam-CO2 Reforming of Natural Gas (천연가스의 수증기-이산화탄소 복합개질용 촉매 충진 반응기의 코킹 회피 운전을 위한 모사)

  • LEE, DEUK KI;LEE, SANG SOO;SEO, DONG JOO;YOON, WANG LAI
    • Transactions of the Korean hydrogen and new energy society
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    • v.26 no.5
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    • pp.445-452
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    • 2015
  • A tubular packed bed reactor for the steam-$CO_2$ combined reforming of natural gas to produce the synthesis gas of a target $H_2/CO$ ratio 2.0 was simulated. The effects of the reactor dimension, the feed gas composition, and the gas feeding temperature upon the possibility of coke formation across the catalyst bed were investigated. For this purpose, 2-dimensional heterogeneous reactor model was used to determine the local gas concentrations and temperatures over the catalyst bed. The thermodynamic potential distribution of coke formation was determined by comparing the extent of reaction with the equilibrium constant given by the reaction, $CH_4+2CO{\Leftrightarrow}3C+2H_2O$. The simulation showed that catalysts packed in the central region nearer the entrance of the reactor were more prone to coking because of the regional characteristics of lower temperature, lower concentration of $H_2O$, and higher concentration of CO. With the higher feeding temperature, the feed gas composition of the increased $H_2O$ and correspondingly decreased $CO_2$, or the decrease in the reactor diameter, the volume fraction of the catalyst bed subsequent to coking could be diminished. Throughout the simulation, reactor dimension and reaction condition for coking-free operation were suggested.

Direct Purification of Lysozyme from Hen Egg White Using High Density Mixed Mode Adsorbent

  • KIM, WON KYUNG;BONG HYUN CHUNG
    • Journal of Microbiology and Biotechnology
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    • v.9 no.3
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    • pp.292-296
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    • 1999
  • The high density mixed mode adsorbent known by the trade name of Mimo-AD was used to purify lysozyme directly from the hen egg white (HEW). The homogenized hen egg white was treated with the adsorbent in a stirred vessel for lysozyme adsorption, and then the adsorbent, easily separated from the HEW by sedimentation, was packed into a column. The remaining HEW and contaminant proteins were removed by washing with pH 11 distilled water in an expanded-bed state, and subsequently the elution was performed with pH 12 distilled water in a packed-bed state. By this simple and rapid adsorption, washing, and elution procedure, lysozyme was purified to>95% with an overall recovery yield of 66%. This process offers a great potential for industrial application by allowing the extraction of lysozyme while retaining the commercial value of HEW.

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An Experimental Study on the Local Effective Thermal Conductivity in Packed Bed (충전층에서의 국부유효열전도율에 관한 실험적 연구)

  • Lee J.S;Yang H.J;Choi K.K;Seo J.Y
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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    • v.16 no.1
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    • pp.81-88
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    • 1987
  • In this paper, the local effective thermal conductivities and calculated by using the actual temperature distribution in packed bed. The variations of these are investigated for radius and air stream direction, flow rate and particle diameter. The resulting local effective thermal conductivi-ties are classified in the inner zone of bed and vicinity zone of the wall surface. Also these are related to dimensionless axial direction position, radius direction position, and particle diameter and Reynolds number which uses particle diameter as the characteristic length. If these correla-tions are represented by function, the equation is showed in Eq. (3-4). This equation is well satisfied with experimental results within $\pm25\%.$

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The Development of Serum-Free Media for the Betrovirus Production and Using It in Continuous Production (유전자 재조합된 레트로바이러스의 생산을 위한 무혈청 배지의 개발과 레트로바이러스의 연속 생산공정 개발)

  • 안지수;조수형;김병기
    • KSBB Journal
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    • v.16 no.3
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    • pp.274-280
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    • 2001
  • A serum-free media for CRIP/MFG-LacZ retrovirus production was developed and applied to continuous packed-bed culture system. The serum-free media developed by fractional factorial design contains indulin ($10\mug/mL$), transferrin ($5\mug/mL$), BSA (4 mg/mL), EGF (25 ng/mL), and linoleic acid ($10\mug/mL$). Operation of continuous packed-bed reactor using Fibra-cel enabled the packging cell to stably maintain retrovirus titer for about 1 week. The optimal operation conditions for dilution rate and temperature were 0.67(h(sup)-1) and $32^{circ}C$, respectively. Using this media, the retrovirus titer(cfu/mL) in the packed continuous culture was about 50% that of continuous culture with serum containing DMEM media.

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