• 한국식품영양학회지
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• 제4권2호
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• pp.141-148
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• 1991

In order to Investigate the extraction mechanism of barley tea in cylindrical packed column, pilot plant scale packed column was designed and constructed. And extraction conditions for steady flow in the packed column were searched. The main results of this study are as follows ; 1. Circulation of the stock barley tea before the extraction running was indispensable In consideration of inequality, gas, particles existed in packed bed. Solid-liquid equilibrium was initially maintained after the circulation. 2. Flow direction of solvent must be up-flow for maintaining the constant bed height and flow rate during the extraction. Paessure drop in pucked bed was similar to decrease ratio of extract concentration. 3. The porosity of packed bed was in the range of 0.24∼0.36 according to the particle sloe. And it was decreased as the particle size became smaller.

• Journal of Microbiology and Biotechnology
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• 제15권3호
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• pp.497-501
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• 2005

This study deals with the removal of mercury species using a packed-bed column with spherical aminated chitosan material. These adsorbents revealed a high adsorption capacity for mercury species. Experiments with feed solutions of 10 ppm Hg dissolved in distilled water showed an excellent removal with a sharp increase of the filter effluent concentration after a total throughput of 900 bed volumes of feed water. Up to $95\%$ desorption was reached by using 3 bed volumes of 0.01 N EDTA solution. EDTA could be recovered by means of sulfuric acid with about $75\%$ efficiency. Almost the same results were obtained in repeated sorption and desorption experiments at identical conditions. The experiments demonstrated that the sorbents possessed practically no sorption capacity for alkaline earth ions ($Ca^{2+}\;and\;Mg^{2+}$). Their influence on the sorption of mercury was negligible. In experiments with spiked tap water of the Karlsruhe Research Centre and a feed mercury concentration of 0.01 mg/l, the breakthrough of Hg was observed only after a total throughput of about 6,000 bed volumes of feed water.

• 한국미생물·생명공학회지
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• 제19권5호
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• pp.497-503
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• 1991

Packed bed column과 continuous stirred tank reactor에서 고정화된 glucoamylase의 catalytic activity를 비교하였다. Settling chamber를 이용한 연속애화, 당화 공정을 사용하여 액화된 전분으로부터 포도당을 연속적으로 생산하였다. . Chitin에 고정화된 glucoamylase에 의한 당화실험에 있어서는 dextrin의 농도가 100g/l일 때, 체류시간 20분 동안 20의 당화수율을 나타냈다.

• Environmental Engineering Research
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• 제25권1호
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• pp.104-113
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• 2020

Adsorptive breakthrough modelling is essential for design of a sorption packed bed. In this work, breakthrough modelling of the furfural uptake in bagasse fly ash (BFA) packed bed has been performed. Effect of various parameters like bed height (Z = 15-60 cm), flow rate (Q = 0.02-0.04 L/min) and initial furfural concentration (C_o = 50-200 mg/L) on the breakthrough curve of furfural sorption in a BFA packed bed have been studied. Enhanced breakthrough performance was observed for the higher value of Z, and lower values of C_o and Q. For C_o = 100 mg/L, packed bed operated at Q = 0.03 L/min and Z = 60 cm was found to have lowest adsorbent utilization rate of 5.61 g/L with highest breakthrough volume of 14.67 L. Bed depth service time and Thomas models well represented the experimental data points under all experimental conditions. It can be concluded that BFA can be utilized efficiently in continuous system for the removal of furfural. Overall, more than 99% of furfural was adsorbed in BFA packed bed at experimental conditions.

• 한국환경과학회지
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• 제23권6호
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• pp.1143-1149
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• 2014

The adsorption experiments of lithium ions were conducted in the fixed bed column packed with activated carbon modified with nitric acid. Effect of inlet concentration, bed hight and flow rate on the removal of lithium ions was investigated. The experimental results showed that the removal and the adsorption capacity of lithium ions increased with increasing inlet concentration, and decreased with increasing flow rate. When the bed height increased, the removal and the adsorption capacity increased. The breakthrough curves gave a good fit to Bohart-Adams model. Adsorption capacity and breakthrough time calculated from Bohart-Adams model, these results were remarkably consistent with the experimental values. The adsorption capacity was not changed in the case of 3 times repetitive use of adsorbent.

• KSBB Journal
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• 제5권4호
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• pp.329-334
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• 1990

In an attempt to develop a novel process for ethanol production from starch, a simultaneous saccharification and fermentation (SSF) process using Zymomonas mobilis and amyloglucosidase (AMG) was studied in continuous modes. Compared with a conventional cylindrical column type of fermentor, the tapered column type of fermentor was found to be superior in terms of reactor performance for ethanol fermentation. The tapered columm fermentor packed with coimmobilized Z. mobilis and AMG alleviated the problems which were associated with CO2 evolution and provided a significantly better flow pattern for both liquid and gas phases in the fermentor without channelling. However, the fluidized bed type of tapered column fermentor using flocculent strain of Z. mobiles and immobilized AMG showed lower productivity (5.2g/1/h) than that of packed bed type of tapered column fermentor(9.2g/l/h).

• 청정기술
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• 제8권4호
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• pp.217-222
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• 2002

본 연구에서는 수직 원통형 충전반응기(packed-bed column reactor)내에 균체가 고정화된 Ca-alginate bead를 넣어 카드뮴이온을 제거하는데 있어 반응기내로 유입되는 유속, 초기농도 등에서 카드뮴 이온($Cd^{2+}$) 제거하는데 최적 조건을 찾고자 하였다. 사용된 균주(Pseudomonas aeruginosa ATCC 27853)는 한국과학기술원 유전공학센터 유전자은행(KCTC)으로부터 구입하였고, Bead로 사용된 Ca-alginate bead는 Sodium Alginate에 균체와 $CaCl_2$를 섞어 제조한 것을 사용하였다. 실험 결과 동일조건일 때 유속이 30 mL/hr > 45 mL/hr > 60 mL/hr의 순서로 제거율이 좋았고 유입속도의 변화에도 불구하고 각 유속에서 50 ppm > 100 ppm > 200 ppm > 300 ppm의 순으로 좋은 제거율을 보였다.

• KSBB Journal
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• 제27권3호
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• pp.145-150
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• 2012

This study was accomplished using packed bed column reactors that contain nonsurface-modified polypropylene media and surface-modified media from hydrophobic surface property into hydrophilic property by ion beam irradiation. The objectives of this research was investigated the characteristics of organic compounds removal and microbe attachment from sewage of school cafeteria in these reactors. In 736.8 mg/L of the average inflow $COD_{Cr}$ concentration the reactors with and without surface modification showed 81.8% and 70.3% of average $COD_{Cr}$ removal efficiencies, respectively, which proves the $COD_{Cr}$ removal efficiency of surface-modified media reactor is higher than that of nonsurface-modified media reactor. After 90 days, there were maximum differences between modified system and non-modified system. In that time the maximum removal efficiency of $COD_{Cr}$ was 96.5% in modified system and was 85.2% in non-modified system that showed removal efficiency of surface-modified media system is 11.3% higher than that of nonsurface-modified media system. The average removal efficiency of SS was 80.4% for the surface modified system and 61.6% for the non-modified system under same condition. Also, the reactor of surface-modified media has advantage on microbe attachment and biofilm formation.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1998년도 추계학술발표회요약집
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• pp.340-340
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• 1998

• 대한토목학회논문집
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• 제32권1B호
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• pp.85-91
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• 2012

영가철을 이용한 투수성 반응벽체는 지하수를 처리하는 원위치정화기술로 국내외적으로 연구가 활발히 진행되고 있다. 본 연구는 기존 영가철을 이용한 투수성 반응벽에 직류전원을 공급하여 효율이 향상된 TCE 처리기술 개발을 목적으로 하였다. 주문진규사로만 충진한 컨트롤컬럼, 영가철과 주문진규사로 충진한 영가철컬럼(영가철:주문진규사 = 1:2(v/v)) 그리고 영가철 컬럼에 직류전원을 공급한 복극전기분해컬럼, 이 세 컬럼의 운전을 통해 TCE 분해효율을 비교하였다. 실험 결과, 영가철를 충진하고 직류전원을 공급한 복극전기분해컬럼이 영가철만을 사용한 컬럼에 비해 높은 TCE의 환원효율을 나타내었다. 이는 영가철 입자가 미세전극으로 작용하여 전자의 이동을 촉진시킨 것에 기인한 것으로 보인다. 따라서 영가철이 반응매질로서의 역할만 할 때보다 반응매질의 역할과 동시에 전극으로서 작용했을 때, TCE 분해효율이 더 높게 나타났음을 알 수 있었다.