• Title/Summary/Keyword: Waste Plastic

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Experimental Study on CO2 Reaction Mechanism in Oxy Gasification Reaction Field (순산소 가스화 반응장에서 CO2 전환 메커니즘 연구)

  • Roh, Seon Ah;Yun, Jin Han;Keel, Sang In;Lee, Jung Kyu;Min, Tai Jin
    • Transactions of the KSME C: Technology and Education
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    • v.3 no.4
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    • pp.285-290
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    • 2015
  • Oxy gasification was performed for the production of high quality syngas from the waste. $CO_2$ was used as reactant with $O_2$ for $CO_2$ gasification and greenhouse gas reduction. Therefore, gasification was performed at high temperature of $1000-1400^{\circ}C$. RPF was gasified in the thermobalance and 0.5 ton/day pilot plant gasifier. Weight variation with temperature and CO production by Boudouard reaction were studied for $CO_2$ gasification of RPF in thermobalance reactor. Syngas of high $H_2$ concentration was produced from oxy gasification in 0.5 ton/day pilot system, which showed appropriate $H_2$/CO ratio for the production of transport fuel and chemical products.

Experimental Study on the Mechanical Properties of Glass Concrete with Powdered Waste Glasses (폐유리 분말을 혼입한 유리 콘크리트의 역학적 특성에 관한 실험적 연구)

  • 배수호;정영수
    • Journal of the Korea Concrete Institute
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    • v.13 no.1
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    • pp.54-61
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    • 2001
  • As a part of the movement of natural resources conservation, there have been doing many recycling research works for obsolete aged tire, wasted plastic materials, etc. The purpose of this experimental study is to develop glass concrete by recycling wasted glasses as a cementitious constituent in concrete. First of all, the optimum replacement ratio of powdered waste glasses(PWG) can be determined through pilot compressive strength test on normal and high strength concrete cylinders, which have been made in various mix proportions by changing the replacement ratio of PWG. Then, further tests have been done to figure out mechanical properties of most desirable glass concrete with optimum replacement ratio of PWG, such as static modulus of elasticity, compressive and tensile strengths, flexural strength. On the other hand, the alkali-silica reactions by the mortar-bar method(KS F 2546) have been experimentally doing in various grain sizes of PWG, since the alkali in the cement has a tendency to react with the silica in the PWG. In can be confirmed from the test that glass concrete can have better workability than concrete with silica fume, and they are alike in compressive strength. It is concluded that wasted glasses can be used as pratical additives for economic and environmentally friendly concrete.

A Basic Study on development of Recycling-Industrial Park to Promote Recycling (재활용촉진수단으로서 산업단지조성에 관한 기초연구)

  • Yoo, Kee-Young;Yi, Sora
    • Journal of the Korea Organic Resources Recycling Association
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    • v.8 no.2
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    • pp.114-123
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    • 2000
  • The aim of this study is to provide basic concept for recycling-industrial park, such as necessity of recycling industry, role of park, construction scheme, etc, in metropolitan area. For this study, questionnaire survey, examination of regulations and walk over survey on industrial parks were conducted. In metropolitan area, recycling industry made incomes of 445 billion won per year and supplied work place for 44 thousand persons. Based on present status and questionnaire analysis, waste recyclers had difficulties in securing factory site, impending the term of contract, NIMBY and proper treating a lot of solid wastes and wastewater, and construction of recycling-industrial park was supposed to be a tool to overcome those problems faced to waste recyclers. By considering the availability of existing industrial park, constraints of constructing new park in metropolitan area, potential recycling amounts and low opinion of moving in to parks, it is reasonable that Inchon-kanghwa district or Seoul adjacent district is potential sites, area for recycling-industrial park are within 640 thousand Pyong, and plastic recyclers are main invited item.

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Recycle of the Glass fiber Obtained from the Roving Cloth of FRP II: Study for the Physical Properties of fiber-reinforced Concrete (폐 FRP 선박의 로빙층에서 분리한 유리섬유의 재활용 II: 섬유강화 콘크리트의 물성에 관한 연구)

  • Kim, Yong-Seop;Lee, Seung-Hee;Yoon, Koo-Young
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.11 no.1
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    • pp.46-49
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    • 2008
  • Recycling glass fiber, 'F-fiber,' was obtained by the separation of the roving layer from waste FRP and the concrete products or structures were considered for its application. Experiment was carried out for the bending strength of aggregate (2.45 of cement) by weight and F-fiber (density of 1.45, volume ratio to all of the aggregate and the cement). Whereas the specimen containing 1% F-fiber showed the bending strength 23% higher than that without F-fiber after curing far 28 days, the one with 0.5% F-fiber did not give any change. It could be found, therefore, that the minimum mixing amount should be larger than 0.5% fur the strength reinforcement. One of the reinforcing concrete product, bench flume, containing 1% F-fiber showed 21% increment of bending strength In contrast to that without F-fiber.

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A CNN Image Classification Analysis for 'Clean-Coast Detector' as Tourism Service Distribution

  • CHANG, Mona;XING, Yuan Yuan;ZHANG, Qi Yue;HAN, Sang-Jin;KIM, Mincheol
    • Journal of Distribution Science
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    • v.18 no.1
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    • pp.15-26
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    • 2020
  • Purpose: This study is to analyze the image classification using Convolution Neural Network and Transfer Learning for Jeju Island and to suggest related implications. As the biggest tourist destination in Korea, Jeju Island encounters environmental issues frequently caused by marine debris along the seaside. The ever-increasing volume of plastic waste requires multidirectional management and protection. Research design, data and methodology: In this study, the deep learning CNN algorithm was used to train a number of images from Jeju clean and polluted beaches. In the process of validating and testing pre-processed images, we attempted to explore their applicability to coastal tourism applications through probabilities of classifying images and predicting clean shores. Results: We transformed and augmented 194 small image dataset into 3,880 image data. The results of the pre-trained test set were 85%, 70% and 86%, and then its accuracy has increased through the process. We finally obtained a rapid convergence of 97.73% and 100% (20/20) in the actual training and validation sets. Conclusions: The tested algorithms are expected to implement in applications for tourism service distribution aimed at reducing coastal waste or in CCTVs as a detector or indicator for residents and tourists to protect clean beaches on Jeju Island.

Assessment of the Recycling of Resource Efficiency through investigating Treatment Flow of the Recyclables (재활용성 폐기물의 처리흐름 분석을 통한 자원순환성 평가)

  • Kim, Jaenam;Kim, Sujin;Phae, Chaegun
    • Journal of the Korea Organic Resources Recycling Association
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    • v.20 no.2
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    • pp.76-88
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    • 2012
  • In this study, the treatment flow of the recyclables(paper, plastic, metal, etc.) collected and separated from MSW was investigated throughout entire phase from separation and collection to final disposal. Based on the site survey, most recyclables came into six material recovery facilities were comparatively managed well. However, some of recyclables showed irrelatively transportation flow. Because the main income source of the recyclables transportation companies is profit margin between treatment and transportation cost based on economics only therefore, it occurs an unnecessary route and long distance transportation while going to final destination. This unreasonable system should be a serious problem relating establishment of the resource recycling system. As a result of this study, in order to establish the reasonably resource recycling system, recycling center including material recovery facility has to manage the recyclables generated in close range preferentially. Also integrated its treatment system over a wide area will need to be considered as a basic step for the reasonable reasonably resource recycling system.

A Study on the Bundle-type Scintillating Fiber and Tapered Scintillator Radiation Sensors for Monitoring of Radioactive Wastes Disposal Sites (방사성폐기물 처분장 감시를 위한 다발형 광섬유 센서 및 Tapered 섬광체 방사선 센서에 관한 연구)

  • 김계홍;박재우
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2003.11a
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    • pp.233-238
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    • 2003
  • Several types of gamma-ray sensors were constructed by packing different numbers of fibers into aluminum tubes, and tested to detect the $^137Cs$ gamma ray. It has been found from this investigation that tapered fibers can be more efficient to collect the lights produced inside the sensor and transfer them into the transmitting fiber in order to predict the functioning of the tapered fiber, tapered plastic scintillators, composed of polystyrene with minute amount of dPOPOP and PPO or dPBD, were fabricated and tested for the detection of gamma rays from 1.0 1.5 3.0 5.0 ${\mu}Ci$ $^137Cs$ sources, and the pulse hight spectrum and the relationship between the radioactivity and the total counts are analyzed. It has been found from this study that the tapered scintillating optical fiber, if manufactured, can be practically applied to the development of gamma-ray sensors which can be deployed In ${\mu}Ci$-level radiation fields

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A Study on Characteristics of Flexural Behavior of High-strength Polymer Concrete Beams Using Recycled PET (PET 재활용 고강도 폴리머 콘크리트보의 휨거동에 관한 연구)

  • Cho Byung-Wan;Park Jong-Hwa;Park Seung-Kook;Bea Sung-Wan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05a
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    • pp.483-486
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    • 2005
  • The polymer concrete is drawing a strong interest as high-performance materials in the construction industry. Resins using recycled PET offer the possibility of a lower source cost of materials for making useful polymer concrete products. Also the recycling of PET in polymer concrete would help solve some of the solid waste problems posed by plastics and save energy. Polymer concrete beams using unsaturated polyester resins based on recycled polyethylene terephthalate (PET) plastic waste were used in our study for grasping its structural behavior of static and fatigue. As a result of static test, Compression stress distribution of Polymer concrete indicates linear behavior such as triangles. Although polymer concrete is high strength materials, its ductility capacity is excellent. From the fatigue test results, There was almost no difference on flexural characteristics between before and after fatigue loading. Therefore, recycled PET polymer concrete remains excellent structural ability after fatigue loading.

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A Study on the Fabrication and Mechanical Properties Evaluation of Natural Fiber Composites added Eco-friendly Materials (친환경 소재를 첨가한 천연섬유 복합재의 제조 및 기계적 물성 평가 연구)

  • Kim, Jae-Cheol;Lee, Dong-Woo;Prabhakar, M.N.;Song, Jung-Il
    • Composites Research
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    • v.33 no.4
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    • pp.213-219
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    • 2020
  • Recently, global facing environmental issues have been raised caused by plastic waste. Hence, increasing the demand for interest in environmentally friendly materials. In this row, research on engineering composite materials also replacing the synthetic reinforcement by introducing natural fibers. However, focus on the strength and interfacial adhesion between matrix and reinforcement is very essential in natural fiber composite, which is insufficient in the literature. There are number of approaches for improving the mechanical strength of the composites, one of the common methods is to reinforce additive nanoparticles. The present investigation, bio-additives were synthesized utilizing bio-waste, cheap, bio-degradable sea-weed powder that could replace expensive nanomaterials and reinforced into the CFRP composite through Hand lay-up followed by a vacuum process. Mechanical properties were evaluated and analyzed through microanalysis. The results concluded that synthesized additives are effective for improving mechanical properties such as tensile, flexural, impact, and shear strength. Overall, the results confirmed that the fabricated composites have potential applications in the field of engineering applications.

Phoswich Detector for Simultaneous Measuring Alpha/beta Particles (알파/베타선 동시측정용 phoswich 검출기)

  • Kim, Gye-Hong;Park, Chan-Hee;Lee, Kune-Woo;Jung, Chong-Hun;Seo, Bum-Kyoung
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.6 no.2
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    • pp.111-117
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    • 2008
  • The new type phoswich detector consisting of the ZnS(Ag) and plastic scintillator for alpha/beta-ray simultaneous counting was developed for monitoring radiological contamination inside pipes. The detection performance was estimated using the PSD (pulse shape discrimination) method as a function of distance between the scintillator and radioactive source. The attenuation of particles traveling through a thin film for preventing the detector from being contaminated was experimentally estimated. It is concluded from our investigation that the phoswich detector developed can provide a sufficient alpha/beta-ray discrimination. The application of a thin film for preventing the detector from being contaminated was proven to be feasible.

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