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RISS 인기검색어
- 검색키워드
- 저자 : Seo Kyung-ae(서경애) (검색결과 11 건)
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보 건설 이후 영산강 보 구간에서의 질소계열 영양염류 및 식물플랑크톤 동태
서경애 ( Kyung-ae Seo ),나정은 ( Jeong-eun Na ),류희성 ( Hui-seong Ryu ),김경현 ( Kyunghyun Kim ) 한국물환경학회 2018 한국물환경학회지 Vol.34 No.4
Insomuch as it is important to manage water quality, from the perspective of water management, it is essential to understand the effect of the weirs on water quality and phytoplankton dynamics in various regions. The purpose of this study is to investigate the characteristics of nitro-nutrients, as well as occurrences and succession patterns of phytoplankton, in the river sections of the two weirs in the Yeongsan River for the five years (from 2012 to 2016) after the weir construction. In respect to this data, the average water temperature measured at the representative point in the section of the Seungchon Weir (17.1 °C) was higher than that of the Juksan Weir (16.6 °C) by comparison. By way of an analysis of this data, it was found that the water quality variables such as, organic matter, nitrogen nutrients and phosphorus nutrients were improved gradually during the period, but the degree of the improvement differs as noted and measured between the weirs. Under the circumstances, it is especially noted that the NH3-N concentration was higher for the point of the Seungchon Weir (2.204 mg/L) than that of the Juksan Weir (1.157 mg/L). This indicates that effluent as seen from sewage treatment plants and hydrological feature near the densely population area, could be the main cause for the incidence of water pollution in the upstream section of the Seungchon Weir. Additionally, the phytoplankton analysis showed that a relative abundance of diatoms and green algae were 56.9 % and 25.8 % respectively. However, it is noted that the cyanobacteria was measured lower as 10.7 %. Also, in the study sites cell density and occurrence frequency of cyanobacteria were relatively lower than compared to the same measurements noted in other rivers.
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서경애 ( Kyung Ae Seo ),정수정 ( Soo Jung Jung ),박종환 ( Jong Hwan Park ),황경섭 ( Kyoung Seop Hwang ),임병진 ( Byung Jin Lim ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.3
The purpose of this study was to investigate the change of phytoplankton fluctuation and long term of water quality of Lake Juam and to evaluate the relationship between phytoplankton pattern and environmental factors data. Correlation and factor analyses were employed to identify key environmental factors affecting phytoplankton dynamics. Of 18 parameters, pH, temperature, COD, BOD and T-P were highly correlated with Chl-a. Phytoplankton data showed that cyanobacteria were dominant, and more than 60% of total algae density. Also Lake Juam received a lot of influence of the Asian monsoon climate. This study presents necessity of multivariate statistic techniques for evaluation of Lake Juam complex data set with a view to get better information data and effective management of water source.
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고도산화공정을 이용한 반응성 염료의 제거 및 생태독성 저감
서경애 ( Kyung Ae Seo ),박재홍 ( Jae Hong Park ),정수정 ( Soo Jung Jung ),임병진 ( Byung Jin Lim ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.2
In this study, the deriving optimum conditions for decolorization of Acid Orange II solution was carried using TiO2 advanced oxidation process. After that, on base of the deriving results, the range of dye concentration was estimated. In addition, acute toxicity test was also carried to assess toxicity unit according to decolorization and TOC removal. In case of the blockage of light, 20mg/L of dye solution, and 0.5g TiO2, the effect of decolorization at pH 3 was larger than at pH 6 and 10, so it was shown that decolorization is dependent on pH. The use of 5 g TiO2 showed best performance of decolorization, but that of 3 g TiO2 was chosen to optimum considering of economical aspects. Four light sources, sun, fluorescent lamp, BLB lamp, and UV B lamp, were used and decolorization was 99.4% and 100% at 50 mg/L, 98.6% and 99.7% at 100 mg/L for sun and UV B lamp, respectively. In spite of the optimum condition of declorization at pH 3, the evaluation of acute toxicity test showed highly toxic. In conclusion, although the optimum treatment of dye solution is performed, water ecology can be polluted in discharging it into water system. Therefore, it is needed to study of water ecological system with dye water treatment, and it takes all the circumstances into consideration.
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낙동강 보 구간에서 남조류의 천이 및 Dolichospermum 속(Nostocales, Cyanophyceae)의 분류학적 고찰
류희성 ( Hui-seong Ryu ),신라영 ( Ra-young Shin ),서경애 ( Kyung-ae Seo ),이정호 ( Jung-ho Lee ),김경현 ( Kyunghyun Kim ) 한국물환경학회 2018 한국물환경학회지 Vol.34 No.5
Freshwater cyanobacterial genus Dolichospermum is one of the most commonly spotted types of phytoplankton, whereas a limited number of studies on morphology of Dolichospermum spp. have been performed in South Korea. The purpose of this study is to investigate the succession pattern of cyanobacteria after weir construction, as well as morphological characteristics of Dolichospermum spp. from natural samples collected in the weir regions of Nakdong River. A total of 31 cyanobacterial taxa observed in this study were classified as belonging to 15 genera, 5 families, and 3 orders. Among them, morphological characteristics in the four species were classified into genus Dolichospermum, for most of the planktic former members of the genus Anabaena, were observed through light microscopy. Water bloom frequently occurred in the middle region of Nakdong River, the maximum number of cyanobacterial species appeared in the lower region of Nakdong River. The appearance of order Chrooccocales was only observed during summer when population density of Microcystis aeruginosa reached an annual peak. In contrast, filamentous cyanobacteria was observed throughout the whole year, even if when water temperature was lower than 5 °C. It implied that the low-temperature-adapted filamentous cyanobacteria can grow in a range of water temperatures. Coil diameter of D. crassum from natural samples was 75 ~ 140 μm (ave. = 91.3 μm; n = 94), slightly larger than those reported by previous studies. Dolichospemum smithii (Komàrek) Wacklin et al. 2009, was described for the first time in Nakdong River.
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geoA 유전자를 이용한 사상형 남조류(Nostocales, Oscillatoriales)의 Geosmin 생성능 검출
류희성 ( Hui-seong Ryu ),신라영 ( Ra-young Shin ),서경애 ( Kyung-ae Seo ),이정호 ( Jung-ho Lee ),김경현 ( Kyunghyun Kim ) 한국물환경학회 2018 한국물환경학회지 Vol.34 No.6
Geosmin is volatile metabolites produced by a range of filamentous cyanobacteria which causes taste and odor problems in drinking water. Molecular ecological methods which target biosynthetic genes (geoA) are widely adopted to detect geosmin-producing cyanobacteria. The aim of this study was to investigate the potential production capability of 8 strains isolated from the Nakdong River. Ultimately, a suggestion for a genetical monitoring tool for the identification of geosmin producers in domestic waters was to be made. Geosmin was detected using solid phase microextraction gas chromatography mass spectrometry (SPME GC-MS) in two strains of Dolichospermum plactonicum (DGUC006, DGUC012) that were cultured for 28 day. The highest concentrations during the experiment period was 17,535 ngL<sup>-1</sup> and 14,311 ngL<sup>-1</sup> respectively. Additionally, geoA genes were amplified using two primers (geo78F/971R and geo78F/982R) from strains shown to produce geosmin, while amplification products were not detected in any of non-producing strains. PCR product (766 bp) was slightly shorter than the expected size for geosmin producers. According to the BLAST analysis, amplified genes were at nucleotide level with Anabaena ucrainica (HQ404996, HQ404997), Dolichospermum planctonicum (KM13400) and Dolichospermum ucrainicum (MF996872) between 99 ~ 100 %. Both strains were thus confirmed as potential geosmin-producing species. We concluded that the molecular method of analysis was a useful tool for monitoring potential cyanobacterial producers of geosmin.
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