• 자원리싸이클링
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• 제29권4호
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• pp.31-44
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• 2020

폐플라스틱 리싸이클링이 사회적 이슈로 부각하여 그 중요성이 날로 더해지고 있는 이때에 우리나라 폐플라스틱의 리싸이클링 현황 및 향후 나아갈 방향에 대하여 고찰하였다. 폐플라스틱 리싸이클링은 비단 우리나라뿐만 아니라 전 세계 주요 경제적, 사회적 문제로 부각되어 환경을 보호하고 다음 세대에 지속가능한 지구를 물려주는데 중요 요소로 다뤄지고 있다. 특히 그동안 전 세계 발생되는 플라스틱 폐기물의 상당량을 처리해 오던 중국이 플라스틱 폐기물의 수입을 중단함에 따라 각국은 자국 내에서 폐플라스틱을 리싸이클링 해야만 하는 문제에 직면하게 되었다. 우리나라도 자원순환법에 의해 폐플라스틱의 매립 및 소각이 더욱 어려워지고 있어 폐플라스틱을 효과적으로 리싸이클링 하여 다시 사용하는 것은 매우 중요한 과제이다.

• 자원리싸이클링
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• 제16권4호
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• pp.47-60
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• 2007

현대생활은 플라스틱 없이는 성립되지 않으며, 폐플라스틱량도 방대하다. 한편 2003년부터 EPR(확대생산자책임)제도가 도입됨에 따라 생활계 혼합 폐플라스틱 발생량이 급증하였다. 플라스틱 리싸이클링에는 플라스틱-플라스틱 간의 선별이 기본으로 되어 있다. 플라스틱간의 선별기술 고도화가 폐플라스틱 재활용의 관건이라 하여도 과언이 아니다. 본고에서는 이와 같은 관점에서 플라스틱 상호선별에 초점을 맞추어, 연구동향과 실용화되어 있는 기술을 기술하고저 한다.

• 펄프종이기술
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• 제47권4호
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• pp.66-75
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• 2015

Disposable diaper waste is consisted of plastic, fiber, and SAP (Super Absorbent Polymer). They are valuable to be used as raw materials of other products including plastic blocks and pulp mold. Nevertheless, disposable diaper waste have been disposed by landfill and incineration without recycling. Due to strict environmental regulations it is necessary to develop fractionation technique to recycle the disposable diaper waste. In this study the fractionation technique using pilot-scale stock preparation units was investigated. Process for separation of plastic and fibers from disposable diaper waste was composed by the combination of pilot-scale pulper, drum screen, screen and cleaner. Recovery rate of plastics and fiber was checked according to the various operating conditions. In drum screen, recovery rate of plastic was high when the cut size of disposable diaper waste was $5cm{\times}5cm$. The highest recovery rate of fiber was achieved with 0.3 mm slot screen. It is important to control the neutral state of SAP for improvement of recovery rate of fiber since SAP can be swelled easily in water. Therefore SAP can be controlled efficiently by the addition of calcium chloride into the pulper. Consequently recovery rates of plastics and fibers were over 90 and 80% under the optimum pilot operating conditions.

• Advances in concrete construction
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• 제16권1호
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• pp.35-57
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• 2023

Majority of the plastic produced each year is being disposed in land after single-use, which becomes waste and takes up a lot of storage space. Therefore, there is an urgent need to find alternative solutions instead of disposal. Recycling and reusing the PET plastic waste as aggregate replacement and fiber in concrete production can be one of the eco- friendly methods as there is a great demand for concrete around the world, especially in developing countries by raising human awareness of the environment, the economy, and Carbon dioxide (CO2) emissions. Self-compacting concrete (SCC) is a key development in concrete technology that offers a number of attractive features over traditional concrete applications. Recently, in order to improve its durability and prevent such plastics from directly contacting the environment, various kinds of plastics have been added. This review article summarizes the latest evident on the performance of SCC containing recycled PET as eco-friendly aggregates and fiber. Moreover, it highlights the influence of substitution content, shape, length, and size on the fresh and properties of SCC incorporating PET plastic. Based on the findings of the articles that were reviewed for this study, it is observed that SCC made of PET plastic (PETSCC) can be employed in construction era owing to its acceptable mechanical and fresh properties. On the other hand, it is concluded that owing to the lightweight nature of plastic aggregate, Reusing PET waste in the construction application is an effective approach to reduces the earthquake risk of a building.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2018년도 추계학술논문요약집
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• pp.511-512
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• 2018

• 한국수소및신에너지학회논문집
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• 제34권6호
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• pp.601-607
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• 2023

Pyrolysis oil (C5-C20) produced using plastic non-oxidative pyrolysis technology produces naphtha oil (C5-C10) through a separation process, and naphtha oil produces hydrogen through a reforming reaction to secure economic efficiency and social and environmental benefits. In this study, waste plastic pyrolysis oil was subjected to a steam reforming reaction on a commercialized catalyst of 46-3Q And it was found that the 46-3Q catalyst reformed the pyrolysis oil to produce hydrogen. Therefore, an experiment was performed to increase hydrogen yield and minimize the byproduct of ethylene. The reaction experiment was performed using actual waste plastic oil (C8-C11) with temperature, steam/carbon ratio (S/C) ratio, and space velocity as variables. We studied reaction conditions that can maximize hydrogen yield and minimize ethylene byproducts.

• Korean Chemical Engineering Research
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• 제61권4호
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• pp.505-516
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• 2023

플라스틱은 가공과 처리가 간단하여 매년 생산량이 증가하고 있으며 이에 따라 플라스틱 폐기물의 양 또한 매년 증가하고 있다. 플라스틱 폐기물 문제를 해결하기 위하여 촉매를 활용한 업사이클링 공정은 유망한 해결책으로 제시되고 있다. 다양한 금속(Ru, Pt 등) 및 지지체(TiO₂, CeO₂ 등)가 폴리 올레핀계 플라스틱의 화학적 재활용에 적용되었다. 입자 크기를 조절하고, 지지체의 특성 및 이종 금속을 도입하여 액체 연료의 선택도를 향상시키고 메탄 생성 양을 줄이려는 시도가 있었다. 한편으로는 값비싼 귀금속의 양을 줄임으로써 최적의 촉매를 찾기 위한 연구를 진행하였다. 본 논문에서는 이러한 hydrogenolysis 반응 및 hydrocracking 반응에서 경제성을 높이기 위하여 어떠한 시도들이 있었는지 살펴보고자 한다. 이러한 관점에서 촉매 업사이클링 공정을 통해 플라스틱 폐기물 문제를 해결할 가능성을 제시하고자 한다.

• 폴리머
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• 제27권6호
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• pp.562-568
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• 2003

폐타이어와 폐플라스틱을 이용한 환경문제 해결과 실용적이고 경제성 있는 재활용품 개발을 목적으로 수행되었으며 밀폐식 혼합기를 이용 폐타이어와 폐플라스틱을 첨가제와 함께 혼합하여 플라스틱 재질별, 폐타이어 함량별 차이에 따른 복합소재 특성을 규명하고자 하였다. 폐타이어/플라스틱 복합소재 실험 결과, 플라스틱 대비 폐타이어 함량을 15 wt%씩 증가시킴에 따라 복합소재의 인장강도와 굴곡강도의 세기는 점차 감소하였으며 신장율은 플라스틱 재질별로 차이가 있었다 폴리프로필렌과 같은 유기첨가제를 폐타이어 (60 wt%)/고밀도 폴리에틸렌 복합소재 전체함량 대비 20 wt% 혼합하였을 때의 인장강도가 폴리프로필렌를 투여하지 않은 복합소재보다 1.5배 높게 나타났으며 에틸렌 비닐아세테이트와 스티렌 에틸렌 부틸렌 스티렌을 각각 10 wt% 첨가 시 2.5배의 신장율이 증가하였다. 또한 무기첨가제 유리 섬유를 폐타이어 (50 wt%)폐고밀도 폴리에틸렌 복합소재 전체함량 대비 10 wt% 첨가 시 굴곡강도가 첨가제가 투여되지 않은 복합소재 굴곡강도보다 63% 높게 나타났다.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 2002년도 춘계 학술발표회 논문집
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• pp.227-234
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• 2002

With the increasing environmental consideration and stricter regulations, gasification of waste is considered to be more attractive technology than conventional incineration for energy recovery as well as material recycling. The experiment for combustible waste mixed with plastic and cellulosic materials was performed in the fixed bed gasifier to investigate the gasification behavior with the operating conditions. Waste pelletized with a diameter of 2~3cm and 5cm of length was gasified at the temperature range of 1100~145$0^{\circ}C$. It was shown that the composition of H$_2$ was in the range of 30~40% and CO 15~30% depending upon oxygen/waste ratio. Casification of waste due to thermoplastic property from mixed plastic melting and thermal cracking shows a prominent difference from that of coal or coke. It was desirable to maintain the top temperature up to foot to ensure the mass transfer and uniform reaction through the packed bed. As the bed height was increased, the formation of H$_2$ and CO was increased whilst $CO_2$ decreased by the char-$CO_2$ reaction and plastic cracking. From the experimental results, the cold gas efficiency was around 61% and heating values of product gases were in the range of 2800~3200㎉/Nm3.

• 한국초등과학교육학회지:초등과학교육
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• 제39권3호
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• pp.399-411
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• 2020

This study aims to explore how elementary students perceive and approach the issue of plastic debris in marine habitats by examining students' perspectives on the ecosystem and environmental solutions. The study was conducted to 143 Grade Four elementary school students in Seoul. After implementing two class-units on plastic waste, students' constructed responses on the problem of and solutions to plastic debris in marine habitats were collected. Data were analyzed through semantic network analysis and the keywords were visualized to reflect their relationships. Furthermore, students' responses on how they perceive environmental problems were further analyzed based on the following analysis criteria: students' perspectives on the ecosystem, the level of complexity of food chain(s), and the scope of their perspective. Also, student responses on environmental solutions were classified to be either at a personal or social level. Through semantic network analysis, keywords identified for students' perceptions on the problem were the sea, plastic, debris, animals, living things, humans, extinction, while keywords extracted for the solutions were plastic, debris, recycling, disposable, and I. Based on the analysis criteria, it was found that students were well aware of the food chain concept, could perceive the ecosystem as having comprised of both biotic and abiotic factors, and could approach the problem beyond the scope of the marine environment. Also, most students mentioned the solutions only at a personal level. Based on the findings, implications on how to move forward in educating environmental issues related to the ecosystem in science education is further discussed.