박테리아 제거를 위한 완속 모래여과에서 탄소나노튜브의 적용성 검토

안희경(Hee Kyung An),박성직(Seong Jik Park) 大韓環境工學會 2014 대한환경공학회지 Vol.36 No.12

본 연구에서는 박테리아 제거를 위한 완속모래여과에서 탄소나노튜브(Carbon Nanotube, CNT)의 적용성을 검토하기 위해서 전자현미경 분석 및 칼럼 실험을 수행하였다. CNT의 형태적 특성을 분석하기 위하여, 주사전자현미경으로 분석한 결과 CNT는 박테리아 부착이 용이한 섬유형태로 응집되어 있었다. CNT의 충진 두께, pH, 이온강도를 달리하며 칼럼 실험을 수행하였다. CNT의 충진 두께가 1 cm, 3 cm, 5 cm로 증가할수록 박테리아 제거율이 44.15%에서 99.95%로 증가하는 것으로 나타났다. 반면, pH가 5.5에서 8.5로 증가할 경우 정전기적 반발력에 의해 박테리아 제거율이 감소하는 경향을 보였다. 이온강도를 0 mM에서 50 mM로 증가하여 칼럼 실험을 수행한 경우 박테리아 제거율이 97.25%에서 70.90%로 감소하였다. 본 연구를 통해 CNT가 오염된 물에 함유되어 있는 박테리아를 처리하는 완속모래여과에 적용 가능한 것으로 나타났다. The applicability of carbon nanotube (CNT) to slow sand filtration for the removal of bacteria was studied using scanning electron microscope and column experiments. The morphology of CNT were investigated using scanning electron microscope and the CNT looked like a skein serving bacteria favorable site for adhesion. Column experiments were performed over a range of CNT filter depth, pH, and ionic strength. Bacteria removal efficiency was found to increase from 44.15% to 99.95% as the CNT filter depth increased from 1 cm to 5 cm, and 3 cm of CNT filter depth was required for significant removal of bacteria. pH increase from 5.5 to 8.5 decreased the bacteria removal efficiency, due to the electrostatic repulsion between bacteria and CNT at higher pH. Bacteria removal efficiency decreased from 97.25% to 70.90% as the ionic strength increased from 0 mM to 50 mM. This study demonstrated that the CNT can be applied to slow sand filtration for treating microbially contaminated water.

염도차 발전 및 정삼투 해수 담수화를 위한 나노섬유상 멤브레엔의 제조

안희경(Hee-Kyung An),박성직(Seong-Jik Park) 한국신재생에너지학회 2014 한국신재생에너지학회 학술대회논문집 Vol.2014 No.11

액상 비료를 유도 용액으로 사용하는 정삼투 기반의 해수 담수화

박성직,안희경,Park, Seong-Jik,An, Hee-Kyung 한국농공학회 2013 한국농공학회논문집 Vol.55 No.2

The present study explored the way to desalinate seawater for agricultural irrigation using forward osmosis (FO) process using liquid fertilizer as draw solution. FO experiments were performed in a cross flow mode using flat sheet FO membrane. The effect of membrane orientation, flow rate, and draw solution concentration on the performance of forward osmosis was investigated by measuring water flux of forward osmosis membrane. The water flux when the draw solution was placed against the membrane active layer was lower than the water flux when the feed solution was placed against the membrane active layer. This results indicated that the decrease of effective osmotic pressure by dilutive internal concentration polarization was less than that by concentrative internal concentration polarization. Increasing flow rate from 66.7 to 133.1 $cm^3$/min resulted in increase of the water flux when the membrane active layer orient to draw solution and feed solution, respectively. The reduction of resistance to water flow increased water flux at higher flow rate. The water flux of FO membrane increased with increasing draw solution concentration from 10000 to 30000 mg/L. The water flux for $KH_2PO_4$ draw solution was similar to that for commercial fertilizer. Optimization of FO process would contribute to economically desalinate brackish water for agricultural use.

학술 논문 : SCM(Supply Chain Management)을 활용한 녹색제품 협업개발 -코웨이 정수기 사례를 중심으로-

김선영 ( Sun Young Kim ),김영상 ( Young Sam Kim ),김봉섭 ( Bong Seob Kim ),안희경 ( Hee Kyung An ) 한국전과정평가학회 2013 한국전과정평가학회지 Vol.14 No.1

대한민국 정부는 2003년부터 SCM(Supply Chain Management)을 활용한 대·중소기업간의 그린파트너십 구축을 지원해왔다. 그린파트너십에 대한 연구는 산업환경정책의 변화와 함께 발전하여2008년에는 기후변화에 대응하기 위한 탄소파트너십 기반 구축을 처음으로 시작하였고, 2011년에는 녹색제품개발 파트너십 구축 연구를 코웨이에 시범적으로 지원하여, 2012년부터 린나이코리아, 애경산업, 케이씨씨에 본격적으로 확대 적용하여 연구를 진행하고 있다. 녹색제품이란 에너지·자원의 투입과 온실가스 및 오염 물질의 발생을 최소화하는 제품이다(``저탄소 녹색성장 기본법`` 제2조 5항). To prevent Climate Change and environmental laws, companies has tried to effort disseminate cleaner production, GPs(Green Partnerships) and CPs(Carbon Partnerships)into SMEs(Small and Medium Enterprises) based on the SCM(Supply Chain Management).Korean government has supported GSCM(Green Supply Chain Management) to develop more and more such as GPs, CPs and GPDPs(Green Product Development Partnerships). Coway, the Korean well-being household electronics company has conducted the GPDPs first with 6 SMEs who produce and supply main parts of the target product, water purifier. At first, Coway constructed the green product development system related each SME``s internal green part development system. Based on the system, Coway and 6 SMEs cooperative developed an improved green product environmentally. And a parent company trained green product R&D experts in SMEs. As a result, Coway Water Purifier, about 26% or more of the environmental improvement achieved was to determine the effectiveness of the system developed for this boration, green product development.

황화수소(H₂S) 감지를 위한 아세트산 납이 침염된 폴리에스터(PET) 섬유 기반의 변색성 센서

이준엽 ( Junyeop Lee ),도남곤 ( Nam Gon Do ),정동혁 ( Dong Hyuk Jeong ),정동건 ( Dong Geon Jung ),안희경 ( Hee Kyung An ),공성호 ( Seong Ho Kong ),정대웅 ( Daewoong Jung ) 한국센서학회 2020 센서학회지 Vol.29 No.5

In this study, the colorimetric sensor, polyester (PET) fabric dyed with lead (II) acetate (Pb(C₂H₃O₂)₂), was fabricated and characterized for the detection of the hydrogen sulfide (H₂S). The surface morphology of the fabric was determined using scanning electron microscope and energy-dispersive X-ray spectroscopy. The optical properties of the fabric were evaluated by measuring the variation in the blue value of an RGB sensor. The fabric showed a significant color change, high linearity (R²: 0.98256), and fast response time (< 1.0 s) when exposed to H₂S. This is because the sensor is highly porous and permeable to the gas. The fabric can not only be used as a hydrogen sulfide sensor but also be used to detect and prevent H₂S influx using sticky tape on pipelines.

청정수소 생산 방식 도입에 따른 LCA 기반 탄소중립 기여도 평가

장소정(SO JEONG JANG),정대웅(DAE WOONG JUNG),김정열(JEONG YEOL KIM),황용우(YONG WOO HWANG),안희경(HEE KYUNG AN) 한국수소및신에너지학회 2024 한국수소 및 신에너지학회논문집 Vol.35 No.2

This study focuses on investigating the importance of managing greenhouse gas emissions from global energy consumption, specifically examining domestic targets for clean hydrogen production. Using life cycle assessment, we evaluated reductions in global warming potential and assessed the carbon neutrality contribution of the domestic hydrogen sector. Transitioning from brown or grey hydrogen to blue or green hydrogen can significantly reduce emissions, potentially lowering CO₂ equivalent levels by 2030 and 2050. These research findings underscore the effectiveness of clean hydrogen as an energy management strategy and offer valuable insights for technology development.

게 껍질을 이용한 수중의 중금속 제거

안희경,박병윤,김동석 한국환경과학회 2000 한국환경과학회지 Vol.9 No.5

In order to examine the availability and effectiveness of crab shell for the removal of heavy metals in aqueous solution, the crab shell was compared with cation exchange resin (CER), zeolite, granular activated carbon (GAC) and powdered activated carbon (PAC) on aspects of heavy metal removal capacity, rate and efficiency. In the removal of Pb, Cd and Cr, the heavy metal removal capacity of crab shell was higher than those of any other sorbents (CER, zeolite, GAC, PAC), and the order of heavy metal removal capacity was crab shell > CER > zeolite > PAC =~GAC. However, in the removal of Cu, the result of crab shell was slightly lower than that of CER. The initial heavy metal removal rate was affected by the sorts of sorbents and metals. In all heavy metals, the heavy metal removal rate of crab shell was higher than those of any other sorbents. Under the heavy metal concentration of 1.0 mmole/ℓ, the heavy metal removal efficiency of crab shell was maintained as 93∼100 %, which was much higher than those of any other sorbents.