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셰일가스 플랜트 용수 처리를 위한 정삼투(FO)와 막증발(MD) 공정의 성능 비교
구재욱(Jaewuk Koo),이상호(Sangho Lee),신용현(Yonghyun Shin),윤택근(Taekgeun Yun) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.3
전 세계적으로 셰일가스와 같은 비전통 석유자원이 널리 개발되고 있다. 이에 따라 셰일가스 채굴과정에서 발생하는 폐수의 적절한 처리가 중요해지고 있다. 그러나, 폐수 내의 오일 및 유기 물질, 유해성 화학물질, 무기 이온과 같은 물질이 고농도로 함유하고 있기 때문에 기존 처리 방법으로 많은 어려움을 격고 있다. 본 연구에서는 셰일가스 폐수에 대한 새로운 처리방법으로 정삼투 공정 및 막증발법에서의 가능성을 연구하였다. 실험실 규모의 정삼투 및 막증발법 장치를 제작하여 실험을 실시하였다. 그 결과, 합성 폐수를 처리하는데, 정삼투 공정에서 적용 가능하다고 판단되었다. 유도용액으로 5M의 염화나트륨수용액을 사용하였고, 낮은 범위의 폐수(66,000mg/L TDS)에서 약 6 L/m2-hr의 플럭스를 나타냈다. 그럼에도 불구하고, 높은 범위의 폐수(261,000mg/L TDS)에서 막증발법으로 처리하는 것이 더 효과적이었다. As non-conventional oil resources such as shale gas have been widely developed, proper treatment of flowback and produced water is becoming important. However, application of conventional water treatment techniques is limited due to high concentration of pollutants such as oil and grease, organics, harmful chemicals, and inorganic ions. In this study, we examined the feasibility of using forward osmosis (FO) and air gap membrane distillation (AGMD) as novel treatment options for shale gas wastewater. Laboratory-scale FO and MD devices were fabricated and used for the experiments. Results showed that FO could be used to treat the synthetic wastewater. Using 5 M NaCl as the draw solution, the flux was approximately 6 L/m2-hr during the treatment of low range wastewater (TDS: 66,000 mg/L). Nevertheless, AGMD was more effective to treat high range wastewater (Total Dissolved Solid: 260,000 mg/L) than FO.
무인선 및 GIS를 활용한 하천 내 클로로필-a와 수심의 공간 분석 및 시각화
김은주 ( Eunju Kim ),황태문 ( Tae-mun Hwang ),구재욱 ( Jaewuk Koo ),이새로미 ( Saromi Lee ),남숙현 ( Sookhyun Nam ) 한국수처리학회(구 한국수처리기술연구회) 2020 한국수처리학회지 Vol.28 No.5
This study is to develop Unmanned surface vehicle (USV) and apply it to rivers to analyze and visualize the space of chlorophyll-a and water depth. The results of the study showed that the chlorophyll-a and the depth of the water in the 2.31×10-<sup>1</sup> ㎢ of the N stream were successful. Data obtained from USV is stored in vast amounts in real time and must be converted and extracted into data that can be utilized through preprocessing programs. In this study, a preprocessing program using the exploratory data analysis (EDA) was implemented and used for converting and extracting data. The chlorophyll-a distribution divided the range based on the domestic water quality environment. As a result, 2.6% of Type Ia (chlorophyll-a 5 mg/㎥ or less), 9.9% of Type Ib (chlorophyll-a 9 mg/㎥ or less), 19.1% of Type II (chlorophyll-a 14 mg/㎥) and 27.9% of Type III (chlorophyll-a 20 mg/㎥ or below) and 27.9% of Type IV (chlorophyll- 35 mg/㎥ or below). Analysis of the water depth distribution showed that 15.8% were below 1m, 14.5% below 2 m, 16.4 percent below 3 m, 34.1% below 4 m, and 19.2% below 5 m. The results of spatial visualization by USV operation were successful. It demonstrated the potential for commercialization of remote monitoring technology development using USV in the future.
자외선/염소 및 자외선/과산화수소 기술에 의한 Microcystin-LR 처리 특성 비교
남숙현 ( Sookhyun Nam ),이주원 ( Joowun Lee ),김은주 ( Eunju Kim ),구재욱 ( Jaewuk Koo ),황태문 ( Tae-mun Hwang ) 한국수처리학회 2022 한국수처리학회지 Vol.30 No.5
Microcystin-LR (MC-LR), the most widely known toxin produced in cyanobacteria, is problematic because of its toxicity. This study was carried out to evaluate the capability of ultraviolet photolysis of chlorine(UV/Cl<sub>2</sub>) and ultraviolet photolysis of hydrogen peroxide(UV/H<sub>2</sub>O<sub>2</sub>). Results showed that direct photolysis with 254 nm UV irradiation achieved substantial toxin removal. In particular, in UV/Cl<sub>2</sub> oxidation treatment, the removal rate of MC-LR was improved through various radical reactions that were similar to UV/H<sub>2</sub>O<sub>2</sub>. In the UV/chlorine process at the pH of 7.0, UV irradiation amount of100 mJ/cm<sup>2</sup> and chlorine concentration of 0.3 mg/L, the MC-LR removal rate was 52.0%, indicating that the removal rate was increased by 24% compared to the UV only treatment. In the UV/chlorine and UV/H<sub>2</sub>O<sub>2</sub> process at pH 7.0, the first-order degradation rate constants of MC-LR were 3.1×10<sup>-3</sup>~3.6×10<sup>-3</sup> s<sup>-1</sup> and 2.9×10<sup>-3</sup>~3.7×10<sup>-3</sup> s<sup>-1</sup>, respectively. It was shown that the degradation rate constant of MC-LR was lowered by 19.4% at pH 9.0 compared to that of pH 7.0, where the analysis found that the change in pH affected oxidation ability. UV/H<sub>2</sub>O<sub>2</sub> was not affected by pH. This result affects the energy consumption needed to meet the required 90% elimination of MC-LR.