• Proceedings of the Korea Water Resources Association Conference
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• 2000.05a
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• pp.851-854
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• 2000

• Journal of Life Science
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• v.10 no.1
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• pp.14-21
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• 2000

The experiments were performed using both batch and continuous column reactors. Batch biodegradation studies were performed under aerobic conditions to determine the biodegradable fraction of the natural organic matter (NOM) source. NOM source was evaluated for its biodegradability at three different UV irradiation conditions and compared to its biodegradability without UV irradiation. In continuous experiments, system operating parameters of empty bed contact time (EBCT), recycle ratio, and influent concentration affected the extent of biofiltration in the biofilters. The effluent UV254/DOC ratios fro the biologically active columns were consistently lower than the influent values, which indicated that the dissolved organic carbon (DOC) removed by biodegradation was not a significant part of the UV-absorbable material. The increase in UV254/DOC ratio was caused by the DOC decrease across the biofilter because there was essentially no difference between the feed and effluent UV254 absorbance values over time. The results of this research showed that biofiltration was an effective method for removing the biodegradable fraction of NOM from water supplies.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.213-214
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• 2000

총 암모니아성 질소(TAN)은 고밀도 양식에서 한계요소로 작용하는 수질인자 중의 하나이다. 생물학적 처리법에 의한 암모니아의 제거는 순환여과식 양식 시스템의 설계에서 가장 중요한 부분이다. 효율적인 순환 여과식 양식 시스템을 위해서는 생물반응기의 질산화 속도식을 구하여 적정한 용량의 처리시스템을 설계하여야 한다. (중략)

• 한국생물공학회:학술대회논문집
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• 2005.10a
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• pp.554-557
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• 2005

Ultrafiltration has been performed to separate proteins, which is almost unique method of protein separation in mass production scale. The problems of its low selectivity and decline in permeation flux resulted from gel formation on the membrane surface have been greatly improved by an applied electric field across the membrane. The applied electric field promoted or hindered the permeation of protein through membranes depending on the electric charge of protein molecules in aqueous solution. With the effects of electric field, the permeation flux and the selectivity of the ultrafiltration could be improved significantly.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.501-502
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• 2001

갯벌의 수질정화기능에 대하여 다양한 정의를 내릴 수 있으나 본 연구에서는 갯벌의 여과식성 저서생물에 의해 수중의 동ㆍ식물 플랑크톤과 데트리터스를 포함하는 입자성 유기물 (POM)이 포집되어 제거되는 기능으로 그 범위를 한정하였다. 갯벌생태계에서 수질정화기능의 핵심적 역할은 단연 이매패류가 담당하고 있다. 이들은 탁월한 여과능력으로 먹이 섭식과정에서 많은 양의 해수를 아가미로 걸러내기 때문에 결과적으로 수층의 입자성 유기물을 물리적으로 제거시키는 자연 여과시스템에 견주어진다. (중략)

• The Korean Journal of Malacology
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• v.19 no.1
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• pp.1-8
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• 2003

The present study was performed to describe the influence of water temperature and salinity on the filtration rates of the short-necked clam, Ruditapes philippinarum. The clams were collected at tidal flat near Yeosu city, Cheollanamdo, Korea, from July 2001 to August 2001. Diatoms, Phaeodactylum tricornutum (KMCC B-128), were indoor-cultured by f/2 medium, and were used to measure the filtration rate of the clams. Filtration rates of the clams were measured by indirect method. Cell concentrations of food organisms were determined by direct counting cells using the hemacytometer under the light microscope. The filtration rate of the clams increased with temperatures up to the optimum temperature, circa 25$^{\circ}C$. Above this optimum temperature, the filtration rate decreased drastically. Also the filtration rate of the clams increased with salinity up to 35 psu. The maximal filtration rates of the clams were recorded at 20-25$^{\circ}C$, similar to be known as the optimal temperature for their growth, and 25-35 psu, respectively. The minimal filtration rates of the clams were recorded at 5$^{\circ}C$ and 15 psu. At the similar temperature and salinity, the filtration rate of the younger clams was higher than that of the older ones. Thermal coefficient, Q$_{10}$ values at low temperature range were much higher than those at high temperature range. These results indicate the short-necked clam is more sensitive in cold water. As they grow up, they become more stronger against their ambient environmental changes, such as thermal-shock, salinity changes.

• Journal of Korean Society of Environmental Engineers
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• v.32 no.8
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• pp.754-760
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• 2010

Geosmin removal by biodegradation was investigated in lab-scale slow sand filtration column with different empty bed contact times (EBCTs) and water temperature. Schmutzdecke layer was built up after 30 days operation and biomass and activity were $4.5{\times}10^6\;CFU/g$ and $3.42\;mg{\cdot}C/m^3{\cdot}hr$, respectively. The attached bio-film microorganisms in schmutzdecke layer were isolated and identified. The dominant species was Pseudomonas sp. that had occupied 56%. Removal efficiencies of dissolved organic carbon (DOC) and geosmin were 27% and 95% after 30 days operation. In lab-scale slow sand filtration column, geosmin and DOC removal efficiencies were 62% and 10% at $5^{\circ}C$, respectively. And increasing water temperature ($15^{\circ}C$ and $25^{\circ}C$) increased the geosmin and DOC removal efficiencies (88~100% and 25~42%) in lab-scale slow sand filtration column. Geosmin and DOC biodegradation rates (k) in the schmutzdecke layer (in the upper 5 cm filter bed) were $1.842{\sim}15.965\;hr^{-1}$1 and $0.253{\sim}1.123\;hr^{-1}$, respectively. It were about 18~32 times and 20~51 times of the rates in the deeper filter bed (5~60 cm).

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2001.05a
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• pp.59-61
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• 2001

휘발성 유기화합물로 오염된 가스 제거를 위한 최적 조건을 찾고자 VOC를 생물학적 처리방법 중 하나인 생물여과기를 이용하여 조사하였다. 100여일 운영 후, 25와 $45^{\circ}C$조건 보다 $32^{\circ}C$조건에서 휘발성 유기화합물의 분해력이 높게 나타났다. 생물여과기는 다양한 휘발성 유기화합물 농도와 EBRT 조건에서 약 100일간 운전되었으며, 최대 제거량 128 $g/m^{3}h$에서 113 $g/m^{3}h$ 임을 알 수 있었다. 휘발성 유기화합물은 체류시간 1～3 min에서 제거율이 30～96%까지 변화하는 것을 보여 주었다. 이상의 휘발성 유기화합물 중 일부는 심각한 환경문제를 야기시키므로 이들 휘발성 유기화합물을 완전 제거하거나 최소화시킬 수 있다면 생물여과 시스템은 안정성과 경제적 측면에서 매우 바람직하겠다. 본 연구 결과는 미생물을 이용한 생물여과법이 효과적인 처리 공정임을 보여주었고 혼합된 휘발성 유기화합물이 존재하더라도 그 성분을 동시에 분해할 수 있다는 결과를 보여 주었다.

• Journal of Korea Water Resources Association
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• v.33 no.S1
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• pp.851-854
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• 2000

• Bioindustry News
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• v.14 no.1
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• pp.20-23
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• 2001