대청호에서 강우와 식물플랑크톤 군집의 관계

정승현 ( Seung Hyun Joung ),안치용 ( Chi Yong Ahn ),최애란 ( Ae Ran Choi ),장감용 ( Kam Yong Jang ),오희목 ( Hee Mock Oh ) 한국환경생물학회 2005 환경생물 : 환경생물학회지 Vol.23 No.1

2001, 2003년의 7월부터 10월까지 대청호에 위치한 댐 지역에서 식물플랑크톤 군집, 환경요인 및 강우량을 조사하였다. 조사 기간동안의 월평균 강우량은 2001, 2003년 각각 91.3, 265.3 mm로 조사되었다 최대 Chl. α의 농도는 2001, 2003년 각각 45.4, 131.5 μg L^(-1)로 조사되었다. 남조류 세포수는 2003년 최대 49,000ce11s mL^(-1)로 조사되었고, 2001년은 최대 200,000cells mL^(-1) 이상으로 조사되었다. 그리고 식물플랑크톤 군집에서 남조류의 상대 풍부도는 2001년 97%, 2003년 74%였다. 2001년은 Microcystis spp.가 조사기간동안 우점종으로 조사되었고, 2003년은 Oscillatoria spp., Phormidium spp., Chroococcus spp. 그리고 Microcystis spp. 순으로 우점종의 변화를 보여줬다. 결론적으로 강우량은 식물플랑크톤의 종 다양성 및 수화현상을 일으키는 남조류 세포 밀도에 영향을 주었다. The phytoplankton community, environmental factors, and rainfall were investigated from July to October in 2001 and 2003 on Dam site in Daechung Reservoir. The monthly average rainfall in the investigated period were 91.3 and 265.3 mm in 2001 and 2003, respectively. The maximum chlorophyll a concentration was observed higher at 131.5 μg L^(-1) in 2003 than at 45.41 μg L^(-1) in 2001. The cyanobacterial number in 2001 was counted up to over 200,000 cells mL^(-1), which was much higher than the maximum number of 49,000 cells mL^(-1) in 2003. The relative abundance of cyanobacteria in the phytoplankton community was about 97% in 2001 and 74% in 2003. Microcystis spp. were absolutely dominant species in 2001, while a couple of cyanobacteria such as Oscillatoria spp., Phormidium spp. Chroococcus spp. and Microcystis spp. were dominant species in 2003. Consequently, it seemed that rainfall affected the diversity of phytoplankton species and decreased the density of bloom-forming cyanobacteria.

분말세라믹에 의한 Microcystis sp. 제거효과

이재원 ( Jae Won Lee ),김민수 ( Min Soo Kim ),정승현 ( Seung Hyun Joung ),안치용 ( Chi Yong Ahn ),김보배 ( Bo Bae Kim ),장감용 ( Kam Yong Jang ),오희목 ( Hee Mock Oh ) 한국환경생물학회 2007 환경생물 : 환경생물학회지 Vol.25 No.2

폴리에틸렌 중합용 촉매 담체 개발 연구

장감용,박성하 한밭대학교 에너지청정기술연구소 2001 에너지청정기술논문집 Vol.1 No.1

실리카는 화학적으로 안정하고 기공특성을 임의로 조절하는 것이 가능하며 촉매의 담체로 많이 이용된다. 또한 실리카에 담지된 금속성분은 내부기공표면에 고르게 분산되어 촉매의 활성을 증가시킨다. 본 연구에서는 폴리에틸렌 중합용으로 사용할 수 있는 촉매의 담체로 실리카를 선택하여 비표면적과 기공부피 등 실리카의 물성을 조절하여 촉매활성을 높이는 연구를 수행하였다. Silica is used frequently as a catalytic support because it is chemically stable and its pore properties are easily controllable. Metal components which are finely dispersed on the internal surface of silica increase catalytic activity. In this study, silica was selected as the catalytic support for the preparation of polyethylene and physical properties of silica such as specific surface area and pore volume were controlled to increase the catalytic activity.

이산화탄소 분리 회수용 세라믹 분리막 개발연구

장감용,박성하 한밭대학교 에너지청정기술연구소 2002 에너지청정기술논문집 Vol.2 No.1

최근에는 막분리법은 CO_2 가스의 분리·회수 효율을 증가시키는 방법으로 주목받고 있다. 본 연구에서는 CO_2 분리막에 적용하기 위하여 고온에서도 사용할 수 있는 세라믹막을 개발하였다. 알루미나 세라믹 지지체는 슬립캐스팅법으로 제작되었고, 세라믹 복합졸은 dip coating법으로 세라믹 지지체에 코팅되었다. 세라믹 코팅과 열처리 조건들이 결정되었다. Recently, the membrane method are being focused to increase the effect of the separation and recovery for CO_2 gas. In this stydy, the ceramic membrane was developed to apply the CO_2 separation membrane which could be used in th high temperature. The Al_2O_3-ceramic supports were prepared using the slip coating method. The ceramic composite sol was coated on the ceramic supports by the dip-coating. The conditions for ceramic coating and heat treatment were determined.

치과용 도재분말의 제조 및 물리적 성질

염근창,고대진,장감용,이서영,김경남 大韓齒科器材學會 1994 대한치과재료학회지 Vol.21 No.1

In this study, the prepared glasses were heat-treated to precipitate the leucite crystal in order to control the thermal expansion coefficient which is an important property of dental porcelain powder. The effect of addition of Li₂O and Na₂O on the amount of the precipitated leucite crystal were also examined. The mixing ratio of the leucite-containing glass must be controlled to match the thermal expansion coefficient of dental porcelain to that of metal. The physical properties of the dental porcelain powder prepared in this study were characterized. The results of this study were obtained as follows : 1. Conditions for the preparation of the maximum amount of leuctie crystal were compostion L-2(2.0 wt% Li₂O added) heat-treated at 950℃. 2. The phase of the precipitated crystals was turned out to be the tetragonal leucite crystal. 3. Maximum relative crystallinity was 64.2% for composition L-2, heat-treated at 950℃. Its linear thermal expansion coefficient was 16.1×10-6/℃ in the range of room temperature to 500℃. 4. The optimum mixing ratio of the leucite-containing glass was 45% in order to match the thermal expansion coefficient of dental porcelain to that of metal. In this case, the thermal expansion coefficient of the prepared dental porcelain was 10.6×10-6/℃ (∼500℃). 5. The physical and chemical properties of the prepared dental porcelain were suitable for the requirements of ISO 6872 and 9693.

세라믹담체를 이용한 페놀계 산업폐수의 생물학적 처리

오희목,구영환,안극현,장감용,고영희,권기석,윤병대 한국산업미생물학회 1995 한국미생물·생명공학회지 Vol.23 No.6

고농도의 phenol과 formaldehyde를 주성분으로 하는 phenol계 산업폐수를 단계적으로 희석하면서, 혼합균주인 GE2와 세라믹담체를 적용하여 80일간에 걸쳐 생물학적으로 처리하였다. 실험구는 제지폐수 슬러지로 30일간 회분식 운전에 의해 적응시킨 대조구, 이것에 GE2를 첨가한 GE2 처리구 그리고 세라믹담체를 적용한 세라믹처리구로 구분하였다. 원폐수의 80배 희석으로 유입수의 COD_Mn이 1,140mg/l 인 경우 각 실험구의 유출수 COD_Mn은 22∼35mg/l로 큰 차이가 없었으나, 20배 희석의 경우 유입수의 COD_Mn이 4,800mg/l일 때, 대조구, GE2 처리구 그리고 세라믹처리구의 유출수 COD_Mn은 179, 128 그리고 94mg/l로서 세라믹처리구의 처리효율이 98.0%로 가장 높았다. 이때 유출수의 phenol 농도는 각기 10.71, 7.93 그리고 5.60mg/l으로 GE2 및 세라믹담체의 적용에 의하여 처리효율이 향상되었다. 한편, 희석배율이 낮아짐에 따라 COD_Mn과 phenol 처리효율에는 큰 변화가 없으나, 유출수의 COD_Mn과 phenol농도가 높아졌다. 따라서, 원폐수를 40배 희석하여 GE2와 세라믹담체를 첨가하여 처리할 경우 유출수의 COD_Mn과 phenol 농도가 32와 1.02mg/l로 수계의 방류수 수질기준에 충분히 적합한 생물학적 처리로 사료된다. A phenolic resin industrial wastewater containing about 41,000 mg/l of phenol and 2,800 mg/l of formaldehyde was biologically treated by a mixed culture GE2 immobilized on ceramic beads. This study was carried out with three experimental groups : Control-only added the sludge of papermill wastewater ; GE2 treatment-added GE2 to Control ; Ceramic treatment-applied ceramic carrier to GE2 treatment. When the original wastewater was diluted 80 times with aerated tap-water, influent COD_Mn was 1,140 mg/l and that of the effluent was in the range of 22∼35 mg/l, which was not much different among the experimental groups. However, at 20-times dilution, influent COD_Mn was 4,800 mg/l and the effluent COD_Mn of control, GE2 treatment and Ceramic treatment was 179, 128 and 94 mg/l, respectively. COD_Mn removal efficiency by Ceramic treatment was the highest, at 98.0%. At this time, the effluent phenol concentration of Control, GE2 treatment and Ceramic treatment was 10.71, 7.93 and 5.60, respectively. As the dilution times decreased, the removal efficiency of COD_Mn and phenol did not change much, but COD_Mn and phenol concentration of the effluent increased. Consequently, it is likely that the phenolic industrial wastewater containing phenol and formaldehyde can be biologically treated using a GE2 and ceramic carrier and that at 40-times dilution, the effluent completely meets the effluent standards for industrial wastewater treatment plant.

세라믹 처리수의 조류생장 억제 효과

김형진,김지환,오희목,장감용,임경묵,심문보 한국환경과학회 2002 한국환경과학회지 Vol.11 No.9

Laboratory experiments were conducted to investigate the effect of ceramic-treated water on the inhibition of algal growth. The growth of Scenedesmus quadricauda and Chlorella vulgaris was enhanced by the ceramic-treated water in Allen medium containing high concentration of nutrients, but inhibited in natural water containing low concentration of nutrients. The growth of Oscillatoria tenuis and Microcystis aeruginosa was inhibited in both Allen medium and natural water. When comparing the effects of ceramic-treated water 1 (NC1) and 2 (NC2), the growth of O. tenuis and M. aeruginosa was somewhat enhanced by NC1, whereas inhibited by NC2. Therefore, it is suggested that NC2 can be more effective than NC1 in controlling the algal growth.