알칼리 환원수 필터의 산화환원전위 안정화 평가

남상엽(Sangyep Nam),권윤중(Yunjung Kwon) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.8

본 연구는 알칼리 환원수기에 3가지 필터(활성카본, 중공사막, 카본블럭)를 이용해서 원수를 통과시켜 통수 양에 따른 산화환원전위(Oxidation Reduction Potential) ORP값이 안정화되는 것을 평가한 것이다. 알칼리 환원수기는 환원의 기능을 가지고 있는 물을 만드는 시스템으로 인체에 유익한 미네랄과 ORP값이 일반 물에 비해 매우 낮은 값을 가지고 있는 기능수이다. 필터를 통과한 물을 전기 분해하면 물속에 있는 음이온과 양이온은 격막을 통해서 –전극 쪽에는 칼슘(Ca⁺), 칼륨(K⁺), 마그네슘(Mg⁺), 나트륨(Na⁺)을 포함한 물로 인체에 유익한 미네랄이 포함된 알칼리 환원수를 얻고 +극에는 염소(Cl),인(P),유황(S)등 -이온을 띄고 있는 유기물이 만들어 진다. 실험에서 알칼리 환원수(Alkaline Reduced Water)에서 전기분해의 전압의 크기를 조절하여 1단(pH8), 2단(pH8.5), 3단(pH9), 4단(pH9.5)으로 알칼리 환원수에 사용되고 –1단(pH6.0), -2단(pH5.0)의 산성산화수로 사용하고 있다. 이러한 시스템으로 3가지 필터에 통수하면서 ORP값이 어떻게 변화하고 어느 정도에서 안정화되는지를 평가하였고 대략 100L는 통수되어야 ORP값이 안정화하는 것을 측정하고 평가하였다. This study is about ionic water generator filter Recently, a lot of people feel deep interest in health and drinking water. Evaluation of the stability of oxidation-reduced potential (ORP) using the filter of the alkaline water. This study utilizes the three filter of activated carbon, UF, carbon block in alkaline reduced water equipment. Passing the water to the filter is evaluated that the OPR values are stability in accordance with the change of the volume in the bucket. Alkaline reduced water equipment is a system that has the function of making the water reduction. This system is the values of the human body beneficial minerals and ORP are made in the functional water has a very low value than general water. Which has passed through the filter the water in the water negative ions and positive ions through the electrolytic. After electrolysis, the cathode side by water, including Ca⁺, K⁺, Mg⁺, Na⁺ water gets Alkaline Reduced Water containing the minerals beneficial to the human body. A positive electrode side is made of the organic materials that have an anion such as chlorine (Cl), phosphorus (P), sulfur(S). This experiment uses the Alkaline Reduced Water to adjust the magnitude of the voltage of the electrolysis in the Alkaline Reduced Water. That is 1st step(pH8) 2nd step (pH8.5) 3th step (pH9), 4th step (pH9.5) in the Alkaline Reduced Water and -1st step (pH6.0), -2nd step (pH5.0) used as the acidic oxidation water. When the water passes through the three filter in this system was evaluated whether the ORP values are changed and stabilized. When about 100 liters of water passing through the filter was confirmed that the ORP values are stability and evaluation.

해수용 기준전극 개발을 위한 겔 타입 내부전해질 제조 및 잔류염소 측정장치에의 적용

김유진 ( Yu-jin Kim ),이해돈 ( Hae-don Lee ),김대원 ( Dae-won Kim ) 한국공업화학회 2017 공업화학 Vol.28 No.2

Hydroxyethyl-cellulose (HEC) 함량별로 겔 타입 내부전해질을 제작하여 이온전도도와 내구성 측정 실험을 수행하였다. 이온전도도 측정결과 HEC 함량이 증가할수록 이온전도도가 감소하여 12% 함량의 겔 타입 내부전해질은 기준전극에 적용이 어려울 것으로 판단하였다. HEC 함량별 내구성 실험결과, HEC의 함량이 감소할수록 carrier density가 증가하여 다공성 막을 통해 유출되는 전해질(KCl)의 양이 증가하였다. 따라서 선박평형수 처리장치와 같이 장시간 사용하기 위해 겔 타입 내부전해질을 HEC 10%로 선정하였다. HEC 10%의 겔 타입 내부전해질을 이용하여 기준전극과 TRO(total residual oxidants) 센서를 제작하여 TRO 분리능 실험을 수행하였다. TRO 센서에 50 mV의 전위를 30 s 동안 동일하게 인가하여 전류변화를 비교한 결과 0.2~30 PSU 조건에서 0~15 mg/L의 TRO 농도가 분리됨을 확인하였다. 따라서 HEC를 이용한 겔 타입 내부전해질을 TRO 센서에 적용할 수 있으며, 이를 이용하여 담수뿐만 아니라 해수 조건에서 TRO를 측정할 수 있음을 확인하였다. Gel type internal electrolytes were synthesized by varying hydroxyethyl-cellulose (HEC) amounts and their durability and conductivity were measured. The ionic conductivity decreased as the content of HEC increased thus the internal electrolyte containing more than 12% of HEC could not be used as a reference electrode. Based on durability test results, as the HEC amount decreased carrier density resulting in increasing of the amount of KCl coming out of the porous membrane. Therefore in order to use long time at ballast water treatment systems, we selected 10% HEC for gel type internal electrolyte. The resolution test for total residual oxidants (TRO) was carried out using the TRO sensor and the gel type reference electrode made of 10% HEC. A 50 mV potential was applied to the TRO sensor for 30 sec and changes in the current were measured. It was confirmed that the TRO concentrations ranging from 0 to 15 mg/L could be separated at salinity conditions of 0.2~30 PSU. The results indicated that the TRO concentration at sea water and at fresh water was successfully measured by the TRO sensor constructed with the reference electrode using gel-type internal electrolyte of HEC.

하·폐수처리시설 2차 처리수를 위한 상용 전해 여과 장치 개발

박종웅,김석영,박기호,최동혁 한국도시환경학회 2019 한국도시환경학회지 Vol.19 No.4

A commercial scale electrolytic oxidation-filtration (EOF) facility was developed and evaluated for further treatment of stabilized water containing recalcitrant residue. Reactor scale up with electrode supplement proved to remove residual chemical oxygen demand (COD) in the sewage stabilized by secondary treatment. The recalcitrant pollutants, residual COD and color in dissolved air flotation treated wastewater receiving industrial wastewater, were also successfully removed. The little variation on the surface morphology and the adsorption potential of filter media by regeneration showed practical usability of the EOF system. The developed commercial scale EOF facility adopting 5 unit, designed to treat 4 m3/day/unit, required only 75 won/m3/day in operation cost and 19 million won in capital cost to treat 20 m3/day of wastewater. 폐수에 남아 있는 난분해성 오염물질의 추가 제거를 위하여 전해 여과 상용화 장치를 개발하고 평가하였다. 반응조 규모를 확장하여도 전극을 보강함으로써 하·폐수 처리시설 2차 처리수에 잔류하는 COD를 효율적으로 제거할 수 있었다. 난분해성 물질로서 산업폐수가 다량 유입되는 시설의 가압부상 처리수의 COD와 색도 제거가 가능하였다. 여재 재생 후에도 표면 형상이나 흡착능력의 차이가 거의 없어 전해 여과의 실용성이 입증되었다. 개발된 상용화 전해 여과 장치의 경제성 평가 결과 5개의 유닛을 채택하여 설계 기준 20 m3/일 처리 시 시설비 1,900만 원, 운영비 75원/일로 실용적인 운영이 가능함을 알 수 있었다.

Polarization characteristics of a low catalyst loading PEM water electrolyzer operating at elevated temperature

Lee, Byung-Seok,Park, Hee-Young,Choi, Insoo,Cho, Min Kyung,Kim, Hyoung-Juhn,Yoo, Sung Jong,Henkensmeier, Dirk,Kim, Jin Young,Nam, Suk Woo,Park, Sehkyu,Lee, Kwan-Young,Jang, Jong Hyun Elsevier Sequoia 2016 Journal of Power Sources Vol. No.

<P><B>Abstract</B></P> <P>The effect of temperature and pressure, and diffusion layer thickness is assessed on performance of a proton exchange membrane water electrolyzers (PEMWEs) with an ultralow iridium oxide (IrO<SUB>2</SUB>) loading (0.1 mg cm<SUP>−2</SUP>) anode prepared by electrodeposition and a Pt/C catalyzed cathode with a Pt loading of 0.4 mg cm<SUP>−2</SUP>. Increasing pressure to 2.5 bar at 120 °C enhances the water electrolysis current, so the anode electrodeposited with 0.1 mg cm<SUP>−2</SUP> IrO<SUB>2</SUB> gives a current density of 1.79 A cm<SUP>−2</SUP> at 1.6 V, which is comparable to the conventional powder-type IrO<SUB>2</SUB> electrode with 2.0 mg cm<SUP>−2</SUP> at a temperature of 120 °C and pressure of 2.5 bar. The major factors for cell performances are rationalized in terms of overpotentials, water flow rates and thickness of diffusion layers, based on polarization behavior and ac-impedance response.</P> <P><B>Highlights</B></P> <P> <UL> <LI> IrO<SUB>2</SUB> anodes with ultralow loading (0.1 mg cm<SUP>−2</SUP>) were fabricated by electrodeposition. </LI> <LI> The effect of operating conditions on PEMWE performance was studied at 120 °C. </LI> <LI> The current density at 1.6 V was as high as 1.79 A cm<SUP>−</SUP> <SUP>2</SUP> at 120 °C and 2.5 bar. </LI> <LI> Water transport characteristics in a PEMWE were experimentally examined. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

세가지 수계 추출 용매를 사용한 은행잎 추출액의 염색성 및 항균성

김정임(Jung Im Kim),최영희(Young Hee Choi),권오경(Oh Kyung Kwon) 한국염색가공학회 2004 韓國染色加工學會誌 Vol.16 No.2

전해환원수에 의한 폴리에스테르 직물의 감량가공 특성

노덕길(Duck-Kil Ro),홍영기(Young-Ki Hong),배기서(Kie-Seo Bae) 한국염색가공학회 2005 韓國染色加工學會誌 Vol.17 No.5

Catalysis Reaction Engineering, Industrial Chemistry : Electrochemical Degradation of Aqueous Phenols Using Graphite Electrode in a Divided Electrolytic Cell

( Marappan Sathish ),( Ram Prasad Viswanath ) 한국화학공학회 2005 Korean Journal of Chemical Engineering Vol.22 No.3

전해활성탄산화법에 의한 축산폐수의 처리

권대원 ( Dae Won Kwon ),박종웅 ( Jong Woong Park ) 한국위생과학회 2008 한국위생과학회지 Vol.14 No.1

하프늄 산화물이 증착된 기체확산층의 물 투과 비교

강병현(Byeong Hyun Kang),임인섭(In Seop Lim),김민수(Min Soo Kim) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12

In this paper, liquid water permeation of GDLs with different HfO₂ deposition cycles is compared to investigate water wettability of GDLs for PEMFC performance improvement. Two modified GDLs with 25, 200 cycle numbers of HfO₂ deposition are prepared by Atomic Layer Deposition(ALD). A reference GDL and two HfO₂ deposited GDLs are inserted in a home-made apparatus for analyzing their water permeability and wettability. Also, electrochemical performance tests of PEMFCs with the modified GDLs are conducted for analyzing effects of GDL wettability on PEMFC performances. The results show that water permeability of the GDL with 25 cycle HfO₂ deposition is lower than that of the reference GDL while the GDL with 200 cycle HfO₂ has much higher permeability than the reference GDL.