• 멤브레인
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• 제29권5호
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• pp.292-298
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• 2019

본 연구에서는 축전식 탈염 공정에 분할 전극을 이용하여 탈염 성능을 향상하고자 하였다. 운전조건으로 NaCl 수용액에 대하여 20 mL/min의 유속과 1.2 V, 3분의 흡착 조건과 -1 V, 1분의 탈착 조건으로 전극의 분할 여부에 따른 탈염 효율을 측정함으로써 실험을 진행하였다. 분할되지 않은 전극에서는 유효면적이 $146cm^2$일 때 40%의 탈염 효율이 나타났고 분할 전극의 유효면적이 $133cm^2$일 때 57%의 탈염 효율을 보였다. 같은 분할된 전극에서 탈염 효율은 2 cm 간격을 두었을 때 49%, 1 cm의 간격을 두었을 때 57%로 확인되었다. 탈염 효율이 일반 CDI보다 분할 전극 CDI가 높았고 분할 전극 사이의 간격이 좁을수록 증가하였다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제17권5호
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• pp.40-48
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• 2012

In this study, economic analysis of five desalination technologies for saline agricultural land was carried out. The analysis was comprehensively evaluated by calculating changes in crop production and benefit/cost (B/C) ratio. The analysis of crop production was in the order of tomato > cucumber > a (musk) melon > watermelon > cabbage, and economical efficiency for desalination technology was in the order of soil exchange > soil addition > electrokinetics > under-drainage > subsoil reversal. In cost benefit analysis, B/C ratio was in the order of under-drainage > soil exchange > electrokinetics > soil addition > subsoil reversal, and all desalination technologies used in this study have the ratio higher than 1, which means economical efficiency was high. Based on the net production considering B/C ratio, the general economic analysis was exactly order from that of crop production analysis. As a result, economical efficiency of soil exchange was highest, and economical efficiency of soil addition and electrokinetic was relatively higher than others.

• 한국지열·수열에너지학회논문집
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• 제18권1호
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• pp.12-19
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• 2022

Desalination has the advantage of being easy to supply water resources. However most desalination devices are developed mainly for large plants and it is not common to use desalination system for a small fishing ship. More than 50% of the input fuel energy of the small shipbuilding's engine is wasted without reused in a ship, and it is necessary to improving the fuel efficiency of the small fishing ship. In this study, a desalination device using waste heat from engine of the ships was developed. As results, it was found that if the condensing chamber uses a fan to circulate the water vapor, the freshwater production was up to 40.0% higher, and the freshwater production efficiency was up to 30.1% increased when the fan was operated.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2001년도 춘계학술대회 논문집
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• pp.112-116
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• 2001

In the paper, desalination technology for a barge mounted plant is presented. Desalination system on a barge needs high efficiency, smaller space, and stability. Therfore 4-effect distillation system (capacity of 50ton/day) is designed and constructed. During operation, detailed investigation of different opereation parameters is carried. This paper discusses about product water flowrate and recover ratio with different steam flow rate and feed water rate.

• Environmental Engineering Research
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• 제20권3호
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• pp.285-289
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• 2015

Complicated and expensive seawater desalination technology is a big challenge in boron removal process. Conventional seawater desalination process of coagulation utilized for pre-treatment is difficult to remove boron. Boron can be removed more effectively in Reverse Osmosis (RO) process than any other processes. In this study, a coagulant with the name Mineral Cluster was examined its boron removal ability. Boron removal efficiency of Mineral Cluster depended on pH value and Mineral Cluster dosage. Desalination process combines the pre-treatment process with Mineral cluster diluted at the ratio of 1:2500 and the RO membrane process. The original sea water could be desalinated to drinking water quality, 1 mg/L, without any pH adjustments. Therefore, if the Mineral cluster is added without any other chemicals for adjusting pH, the desalination process would be much safer, efficient and economical.

• 대한기계학회논문집B
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• 제38권5호
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• pp.407-412
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• 2014

가스하이드레이트 원리를 이용한 신개념의 해수담수화 장치를 제안하였다. 본 연구의 연속식 장치는 하이드레이트를 제조하고, 듀얼실린더의 압축공정에 의해 해수로부터 순수의 하이드레이트 펠릿화가 가능하다. 해수 샘플로부터 용존된 각 이온들의 제거 효율이 유도결합플라즈마분광광도계(ICP-AES)와 이온크로마토그래피(IC)에 의해 분석되었다. 본 연구에서 제안된 방법과 장치를 이용한 해수담수화시 형성된 하이드레이트 결정과 고농도의 염농축액과의 분리에 어려움이 있지만, 이를 해결함으로 좀더 효율적인 해수담수화 공정 적용이 가능할 것으로 판단된다.

• 한국가시화정보학회지
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• 제20권2호
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• pp.13-20
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• 2022

An effective capacitive deionization process termed membrane capacitive deionization (MCDI) is newly designed and experimentally tested for seawater desalination. By preventing co-ions to be expelled, MCDI can improve the ion removal performance, but there is a trade-off between blocking co-ion transfer and increasing contact resistance. The conventional MCDI uses 2D-shaped films which increase contact resistance and reduce desalination performance in the trade-off. In this paper, with the 3-D shape of Nafion coated activated carbon cloth, the mentioned problems are expected to be solved making the desalination performance better. We visualized ion concentration and fluid flows with half-MCDI cell that can measure only efficiency of cathode. We found the optimal number of coatings which have the better efficiency than CMX, commercial cation exchange membrane in fixed current conditions of 100uA.

• 상하수도학회지
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• 제30권4호
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• pp.401-408
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• 2016

Desalination is getting more attention as an alternative to solve a global water shortage problem in the future. Especially, a desalination technology is being expected as a new growth engine of Korea's overseas plant business besides one of the solutions of domestic water shortage problem. In the past, a thermal evaporation technology was a predominant method in desalination market, but more than 75% of the current market is hold by a membrane-based reverse osmosis technology because of its lower energy consumption rate for desalination. In the future, it is expected to have more energy efficient desalination process. Accordingly, various processes are being developed to further enhance the desalination energy efficiency. One of the promising technologies is a desalination process combined with Pressure Retarded Osmosis (PRO) process. The PRO technology is able to generate energy by using osmotic pressure of seawater or desalination brine. And the other benefits are that it has no emission of $CO_2$ and the limited impact of external environmental factors. However, it is not commercialized yet because a high-performance PRO membrane and module, and a PRO system optimization technology is not sufficiently developed. In this paper, the recent research direction and progress of the SWRO-PRO hybrid desalination was discussed regarding a PRO membrane and module, an energy recovery system, pre-treatment and system optimization technologies, and so on.

• 상하수도학회지
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• 제27권6호
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• pp.771-778
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• 2013

Gas hydrate (GH) process is a new desalination technology, where GH is a non- stoichiometric crystalline inclusion compounds formed by water and a number of gas molecules. Seawater GH is produced in a low temperature and a high pressure condition and they are separated from the concentrated seawater. The drawback of the GH process so far is that salt contents contained in its product does not meet the fresh water quality standard. This means that the GH process is not a standalone process for seawater desalination and it needs the help of other desalting process like reverse osmosis (RO). The objective of this study is to investigate the effect of GH process on energy saving for RO process in seawater desalination. The GH product water quality data, which were obtained from a literature, were used as input data for RO process simulation. The simulation results show that the energy saving effect by the GH process is in a range of 68 % to 81 %, which increases as the salt removal efficiency of the GH process increases. Boron (B) and total dissolved solids (TDS) concentrations of the final product of the hybrid process of GH and RO were also investigated through the RO process simulation to find relavant salt rejection efficiency of the GH process. In conclusion, the salt rejection efficiency of the GH process should exceed at least 78% in order to meet the product water quality standards and to increase the energy saving effect.

• 공업화학
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• 제21권1호
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• pp.87-92
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• 2010

탄소전극으로만 구성된 단위 셀(CDI)과 음극 표면에 양이온교환막을 결합한 단위 셀(MCDI)을 제작하여 탈염실험을 수행하였다. 실험결과 탈염속도와 탈염량은 셀 전위가 증가할수록 선형적으로 증가하였다. 그러나 동일한 탄소전극을 사용했음에도 불구하고 MCDI 셀이 CDI 셀보다 높은 탈염효율을 보였다. 셀 전위를 0.8~1.2 V로 변화시키면서 실험한 결과 흡착량은 셀 전위에 따라 MCDI 셀이 CDI 셀보다 33.1~135% 정도 증가하는 것으로 나타났다. 또한 전류효율에서도 MCDI 셀은 80% 정도를 나타낸 반면 CDI 셀은 40% 이하의 전류효율을 나타내었다. MCDI 셀에서 탈염효율이 높은 원인은 흡착 및 탈착전위가 인가되었을 때 전극 표면의 전기이중층과 bulk 용액 사이에서 이온들이 선택적으로 이동하기 때문인 것으로 사료된다.