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막증발법 공정에서 셰일가스 플랜트 용수 처리: 막 오염 효과
구재욱,황태문 한국수처리학회 2022 한국수처리학회지 Vol.30 No.4
The increase in shale gas production in recent years has resulted in environmental and water management challenges because the water utilized in hydraulic fracturing contains many pollutants. Therefore, the treatment of this wastewater has received significant attention. In the present study, the feasibility of membrane distillation for the treatment of wastewater from shale gas plants was examined. The results indicated that direct-contact membrane distillation (DCMD) is suitable for treating both low-range and high-range flowback water. Based on theoretical calculations and long-term experiments, DCMD was shown to achieve a recovery rate of over 70%. However, the flux abruptly decreased above this critical recovery rate due to membrane fouling. The examination of fouled membranes using scanning electron microscopy revealed that scale was the major source of fouling. In order to ensure that DCMD can become a reliable next-generation desalination technology, the membrane fouling mechanisms were investigated in more detail. This study confirmed that DCMD could be used to treat high-concentration wastewater, but membrane wetting occurred due to scale formation, oil, and grease. Moreover, oil and surfactants were identified as serious obstacles to the use of DCMD because they cause membrane wetting. .
선박 엔진폐열을 활용한 진공식 막증발 시스템 개발 및 평가
구재욱,남숙현,김은주,이상호,황태문 한국막학회 2016 한국막학회 총회 및 학술발표회 Vol.2016 No.11
선박에 주로 사용되는 기존 해수담수화 공정의 경우 많은 에너지가 소모 된다는 단점이 있다. 막증발법(MD)은 유입수의 삼투압으로 인한 구동력의 저하가 역삼투공정에 비해서 낮은 장점을 가지며, 비교적 낮은 온도(60 ∼ 80℃)에서 운전 가능하기 때문에 선박의 엔진 폐열, 해수열원 등을 활용하여 운전 비용을 절감할 수 있다. 본 연구에서는 실험실 규모의 진공식 막증발 장치에서 도출된 조건을 바탕으로 3 m3/일 규모의 실제 VMD 파일럿플랜트를 설계 및 제작하여 성능을 평가하였다. 운전결과, 3~5 L/㎡-hr의 플럭스와 99.99%의 염제거율을 나타냈다.
주관적/객관적 가중치를 이용한 한국 도서지역의 물이용 취약성 평가
구재욱,황태문,신용현,남숙현,김은주 한국수처리학회 2023 한국수처리학회지 Vol.31 No.4
In island areas without a water supply pipe, water use is limited to small reservoirs or groundwater. These small reservoirs depend on precipitation and are not always available due to changes in precipitation patterns. Island areas in Korea are susceptible to drought, and water supply restrictions and the transport of water from the mainland are necessary to relieve the impact of drought conditions. A method for assessing water use vulnerability that considers the unique characteristics of these islands is required to respond to water scarcity during times of drought. In developing a vulnerability assessment, we used the pressure-state-response (PSR) framework to establish indicators corresponding to pressure, state, and response. We employed objectively weighted decision-making using the entropy method to identify the indicators for each factor. To establish the weight reflecting the importance of each factor, we used subjective weighting according to the Delphi method. The water use vulnerability assessment method was developed by adding factors representing the groundwater and sea levels according to the characteristics of the islands. The results of this assessment of the water use vulnerability in island areas revealed the most vulnerable area and the water supply priority area. The method developed in this study reflects subjective opinions for water use in island areas and can be used to assess water use vulnerability by calculating the weights of specific indicators based on the differences of the alternatives. This method forms the basis for an approach to determining priority areas for transported water supply. .
구재욱,남숙현,심진우,김은주,최용준,황태문 대한상하수도학회 2016 상하수도학회지 Vol.30 No.6
Pressure retarded osmosis (PRO) processes can be implemented on a number of water types, using different technologies and achieving various power outcomes. In this study, Sewage facility effluent was used for feed solution of PRO and synthetic NaCl water for draw solution. This study was conducted to investigate effect of water quality of pretreatment on power density and flux decline in PRO process. The results show that organic and particulate foulants have to be removed for more stable operation. Flourescence technique with EEM enables to investigate the chemical properties of aquatic organic matter by extracting spectral information. Humic/fulvic matters and soluble microbial by-products were analyzed as the most affecting factors on the PRO performance. As a result of analyzing the whole system based on the energy consumption of the unit process, specific energy consumption(SEC) of the applicable technology for PRO pre-treatment should be about 0.2 kWh/m3 or less.
구재욱,이상호,홍승관,김준하,Koo, Jae-Wuk,Lee, Sangho,Hong, Seungkwan,Kim, Joon Ha 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1
Shale gas has the potential to significantly change the way of the world's energy use. However, there are increasing concerns on environmental problems, particularly with respect to water use and wastewater treatment. This paper highlights issues related to shale gas water management and technologies currently used to address them. It also presents perspectives of emerging technologies for the treatment of shale gas wastewater, including forward osmosis (FO) and membrane distillation (MD). 셰일가스는 전 세계의 에너지 사용방식을 크게 변화시킬 만한 잠재력을 가지고 있다. 그러나 셰일가스 생산과정에서의 물의 사용과 폐수의 처리와 관련된 환경문제에 대한 관심이 증가하고 있다. 이 논문은 셰일가스 용수관리와 관련된 이슈를 제시하고 이러한 이슈를 해결하기 위한 기존 기술들에 대한 내용을 소개하고 있다. 또한 본 논문은 정삼투와 막증류와 같이 셰일가스 폐수처리를 위한 새로운 기술의 전망에 대해서도 다루고 있다.