• Korean Chemical Engineering Research
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• 제60권4호
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• pp.525-534
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• 2022

본 연구에서는 물과 전기의 동시 생산이 가능한 pressure retarded membrane distillation (PRMD)의 폐루프식 구성 디자인을 기수담수화에 적용해 최적 운전 조건과 성능 평가를 수행하였다. 시뮬레이션 결과 80 ℃ 이상의 폐열이 공급될 때 순 에너지 생산량이 양수 값을 보이며 90 ℃ 이상일 때 안정적인 전력 생산이 가능한 것을 확인할 수 있었고 최적 유입수 유량은 0.6 kg/s를 나타냈다. 이 조건에서 3 g/L의 기수가 유입될 때 순 에너지 생산량은 2.56 W/m², 물 플럭스는 8.04 kg/m²/hr의 값을 나타냈다. 기수의 농도가 1-3 g/L로 변화할 때 물 플럭스나 에너지 생산량은 큰 변화가 나타나지 않았고, 해수가 유입수로 사용될 때와 비교하면 더 높은 물 플럭스와 순 에너지 생산량을 보였다. 이를 통해 에너지 생산이라는 측면에 집중한다면 기수를 사용해서 PRMD를 운전하는 것이 더 효율적이라는 것을 확인할 수 있었다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제26권6호
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• pp.95-105
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• 2021

Extensive groundwater abstraction has been recognized as one of the major challenges in management of coastal groundwater. The purpose of this study was to assess potential changes of groundwater distribution of northeastern Jeju Island over 10-year duration, where brackish water have been actively developed. To quantitatively estimate the coastal groundwater resources, numerical simulations using three-dimensional finite-difference density-dependent flow models were performed to describe spatial distribution of the groundwater in the aquifer under various pumping and recharge scenarios. The simulation results showed different spatial distribution of freshwater, brackish, and saline groundwater at varying seawater concentration from 10 to 90%. Volumetric analysis was also performed using three-dimensional concentration distribution of groundwater to calculate the volume of fresh, brackish, and saline groundwater below sea level. Based on the volumetric analysis, a quantitative analysis of future seawater intrusion vulnerability was performed using the volume-based vulnerability index adopted from the existing analytical approaches. The result showed that decrease in recharge can exacerbate vulnerability of coastal groundwater resources by inducing broader saline area as well as increasing brackish water volume of unconfined aquifers.

• Korean Chemical Engineering Research
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• 제55권5호
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• pp.685-689
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• 2017

We studied the removal of zinc ions from synthetic brackish water by an adsorption method using natural Algerian Bentonite (NAB). The effect of the main physico chemical parameters-contact time, pH, temperature, ionic strength, clay weight and initial metal ion concentrations on the removal of $Zn^{+2}$-were investigated. The results showed that equilibrium was attained within 10 min of stirring time. The retention capacity of $Zn^{+2}$ increased with the increase of pH, the adsorbent dose and ionic strength. A modelization study showed that the adsorption follows Langmuir isotherm, while its kinetics was pseudo-second-order. Based on the results, it was concluded that NAB, which is natural and available, could be used as an alternative for the removal of zinc from saline aqueous solutions.

• Animal Systematics, Evolution and Diversity
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• 제8권2호
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• pp.325-330
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• 1992

1984년 4월에 강원도 일원의 경포호, 송지호, 영랑호 등의 기수역에서 채집된 윤형동물을 동정한 결과 Notholca liepetterseni, Keratella cruciformis eichwaldi, Dipleuchlanis propatula propatula의 2과 1종, 2아종이 확인되어 이들을 모두 재기재하였고 아울러 도판을 작성하였다. 이중 Notholca liepetterseni는 한국 미기록종이다.

• 환경생물
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• 제36권3호
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• pp.291-298
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• 2018

Samples were collected from benthic and subaerophytic habitats of fresh and brackish water in Korea from April 2017 to April 2018. Accordingly, three genera and seven species were newly recorded in Korea. Three unrecorded genera were Cephalothrix, Cyanophanon and Toxifilum, and seven species were Anagnostidinema pseudacutissimum, Calothrix elenkinii, Cephalothrix komarekiana, Cyanophanon mirabile, Cyanosarcina chroococcoides, Leptolyngbya ectocarpi and Toxifilum mysidocida. Anagnostidinema pseudacutissimum and Cephalothrix komarekiana had been previously reported to inhabit freshwater, but these were found to be present in brackish water during the period of the present study. Also, Cyanosarcina chroococcoides previously reported to inhabit moorland waters and swamps, were found to be present in subaerophytic habitat.

• 환경생물
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• 제36권3호
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• pp.241-251
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• 2018

To find unrecorded diatom species, random materials were collected from the freshwater, brackish water, and coastal waters. Benthic and periphytic diatoms were sampled from twelve localities. Thirteen species belonging to eight genera are newly added to the national flora of diatom. In the intertidal areas, the five species are new to Korea, Anaulus minutus Grunow, Anaulus simonsenii Witkowski & Metzeltin, Eunotogramma laeve Grunow, Eunotogramma productum Grunow, and Nitzschia subcapitellata Hustedt. The following two species are new from brackish waters, Chamaepinnularia krookiformis (Krammer) Lange-Bertalot & Krammer and Cymatoneis ovalis Heiden. The following four species are new from mountain peatlands, Geissleria ignota (Krasske) Lange-Bertlaot & Metzeltin, Chamaepinnularia hassiaca (Krasske) Cantonati & Lange-Bertalot, Chamaepinnularia mediocris (Krasske) Lange-Bertalot and Pinnularia linearidivergens Kulikovskiy, Lange-Bertalot & Metzeltin. The following two species are new from river or streams, Cymbella hustedtii var. compacta Krammer and Cymbella stigmaphora ${\emptyset}strup$.

• Animal cells and systems
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• 제11권2호
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• pp.247-253
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• 2007

A new species of Nitokra and Ameira parvula (Claus) belonging to the family Ameiridae are recorded from brackish waters in South Korea. Nitokra koreanus n. sp. most resembles N. spinipes and N. pietschmanni, however, it is characteristic in having the character combination of ellipsoidal P5 exopod and very short P1 enp 1. Ameira parvula is reported for the first time from the Northwestern Pacific. Description of the new species and the taxonomic accounts of both species are presented.

• 한국수산과학회지
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• 제28권1호
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• pp.60-66
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• 1995

새로운 식중독 원인균으로 주목을 받고 있고 수권에서 잘 검출된다고 알려져 있는 V cholerae non-O1과 V. mimicus를 대상으로 민물, 기수 및 해수에서 염도와 온도의 변화에 따른 균수의 증감을 조사한 결과는 다음과 같다. 1. 민물에서 V. cholerae non-O1은 $26\pm1^{\circ}C$보다 4와 $15^{\circ}C$에서 생잔기간이 길었으며 V. mimius는 4와 $26\pm1^{\circ}C$보다 $15^{\circ}C$에서 생잔기간이 길었다. 2. 기수에서는 두 균주 모두 15, 4, $26\pm1^{\circ}C$으로 생잔기간이 길었다. 3. 해수에서는 두 균주 공히 온도가 높을수록 생잔기간이 짧았으며, $4^{\circ}C$에서 실험조건 중 생잔기간이 가장 길었다. 4. 민물에서는 V. mimicus보다 V. cholerae non-O1의 안정성이 높았고, 기수에서는 V. cholerae non-O1보다 V. mimicus의 안정성이 높았으며 해수에서는 두 균 사이에 큰 차이가 없었다. 5. 염도와 온도의 변화는 V. cholerae non-O1과 V. mimicus의 생잔에 중요한 인자이다.

• 한국재료학회지
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• 제29권1호
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• pp.16-22
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• 2019

Indirect oxidation using chlorine species oxidizing agents is often effective in wastewater treatment using an electrochemical oxidation process. When chlorine ions are contained in the wastewater, oxidizing agents of various chlorine species are produced during electrolysis. In a ballast water management system, it is also used to treat ballast water by electrolyzing seawater to produce a chlorine species oxidizer. However, ballast water in the brackish zone and some wastewater has a low chlorine ion concentration. Therefore, it is necessary to study the chlorine generation current efficiency at various chlorine concentration conditions. In this study, the chlorine generating current efficiency of a boron-doped diamond(BDD) electrode and insoluble electrodes are compared with various chloride ion concentrations. The results of this study show that the current efficiency of the BDD electrode is better than that of the insoluble electrodes. The chlorine generation current efficiency is better in the order of BDD, MMO(mixed metal oxide), $Ti/RuO_2$, and $Ti/IrO_2$ electrodes. In particular, when the concentration of sodium chloride is 10 g/L or less, the current efficiency of the BDD electrode is excellent.

• Journal of Species Research
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• 제5권3호
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• pp.514-516
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• 2016

Three marine and one brackish-water ciliates (Dysteria crassipes $Clapar\grave{e}de$ and Lachmann, 1859; Gruberia calkinsi $Beltr\acute{a}n$, 1933; Pleuronema salmastra Dragesco, 1986; Zosterodasys agamaliev Deroux, 1978) were isolated from Incheon in Korea and their morphologies were investigated using live observation and protargol impregnation.