• Environmental Engineering Research
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• v.24 no.1
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• pp.74-81
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• 2019

Upcycling generally refers to the conversion of waste materials to something useful or valuable and is a useful concept that can be applied not only to the waste design industry but also to waste recycling and resource circulation. Our study highlights upcycling as the key concept for improving the value of waste by redefining the concept as "the recycling of waste materials and discarded products in ways that enhance their value." Four upcycling strategies are linked to material flow analyses conducted on waste electronic and electrical equipment, specifically waste refrigerators and waste computers, to examine the technologies available for implementation and suggest guidelines for the promotion of upcycling. The amount of waste refrigerators collected by the formal sector was 121,642 tons/y and the informal sector, 63,823 tons/y. The current recycling ratio of waste refrigerators was estimated as 88.53%. A total of 7,585 tons/y of waste computers were collected by the formal sector and 3,807 tons/y by the informal sector after discharge. Meanwhile, the current recycling ratio of waste computers was estimated as 77.43%. We found that it is possible to introduce 28 upcycling technologies in the case of refrigerators, and 15 technologies are available to promote upcycling in the case of computers. By refining the broad concept of upcycling and looking at the stages of material flow, our approach presents universally applicable directions for incorporating upcycling in resource recovery and recirculation plans.

• Resources Recycling
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• v.15 no.6 s.74
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• pp.25-32
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• 2006

In this study, waste car tau lamps that usually gets incinerated or buried has been recovered during the dispose process in order to increase the recycling rate of waste cars and the material separation research was performed by applying triboelectrostatic separation method. After a series of charging characteristic test, PMMA materials was confirmed of being an effective charging material for waste car tail lamp material separation, a cyclone charger using PMMA material for continuous process was developed. In optimum test conditions using triboelectrostatic separator developed in this study, high quality PMMA material with recovery rate of 99.0% and 90.2% was achieved from the waste car tail lamp. Therefore, a material separation technology that can recycle tail lamps of waste cars has been established.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.40 no.3
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• pp.42-47
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• 2008

For the purpose of reduction of production cost in the industrial papermaking process, the use of waste paper has been more and more increased as a fibrous raw material, and the closed system of white water became closed more than ever. "Scum" indicates the floated sludge by a flotation during primary wastewater treatment process in paper mills. If the scum is used as the raw material, it could reduce both the raw material and solid waste treatment cost with even small quantity. In this study, the element survey and the toxicity measurement was carried out for recycling scum. A load factor of stock preparation process in paper mills was measured by somerville screen. Physical properties of paper sheet containing the accepted scum from the stock of AOCC or KOCC were evaluated. The result of this study shows that recycling scum has potential to be used in paper making system. It also might be able to reduce the required energy used by the pressing or drainage process, the raw material cost, and solid waste treatment cost due to the recycling of scum.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2022.11a
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• pp.45-46
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• 2022

Recently, it is necessary to establish an eco-friendly construction system through recycling of waste material management at construction sites. This is required to reflect the times that require a carbon reduction system in construction as part of domestic and overseas carbon dioxide reduction. Therefore, we intend to establish eco-friendly construction management as part of resource recycling and carbon reduction through recycling technology for waste fibers generated at construction sites.

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2006.09a
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• pp.75-84
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• 2006

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2006.05a
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• pp.119-123
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• 2006

• Resources Recycling
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• v.3 no.1
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• pp.44-51
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• 1994

PET bottles were composed of several different materials such as PET, HDPE, PVC and PP, it is necessary for recycling of PET bottles to precede seperation of each material. This study is purposed of recycling of PET bottles by separation using float and sink method. Pure PET is obtained a proportion of 94% on condition that bottle labels were removed by using tap water. In case the labels were attached on the bottles, PET was unable to obtain because of PVC and PET sink, and PP and HDPE float. Therefore, the labels should be removed before separation of PVC lebels substituted for PP or PE material. The various physical properties of recovered PET and HDPE were measured and compared with the original PET and HDPE, and it is identified that recycling is possible as a result.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.26 no.7
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• pp.555-562
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• 2013

The new recycling technology for aged aluminum wires in overhead conductor has been carried out. The authors are attempting to develop remanufacturing method for them for more effective way of recycling in stead of its conventional remelting process. The new recycling technology for aged aluminum wire in overhead conductor was composed of four steps in different develop process, destranding process for conductor, surface cleaning process, welding process and drawing process for aluminum wire. This paper investigates the properties during recycle process of aged aluminum wire. The results of microscopic analysis and mechanical properties were discussed to underscore recycling aluminum wire. Various graphs are presented accompanied by discussion about their relevance on the process. In conclusion, we confirmed the possibility of remanufacturing technique by using new process.

• Composites Research
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• v.34 no.3
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• pp.167-173
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• 2021

Recently, metal-composite hybrid structures became a very attractive material system for various applications such as automobile and air vehicles due to their design flexibility as well as superior mechanical properties. On the other hand, recycling is a hot issue to reduce material wastes and environmental pollution, so that many countries made recycling regulations. But the recycling of metal-composite hybrid structures is not fully considered since the development and application are very early stage. We developed and optimized the recycling process for metal-composite hybrid structures based on the easy adaptation of the local recycling companies.

• Journal of Applied Reliability
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• v.11 no.4
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• pp.357-369
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• 2011

Eco-robot for collecting recycling products is the machine which collects non-industrial wastes such as cans, PET bottles and etc. to reuse them as recycling resources. This eco-robot is operated in the condition that it should compress and hold various products without knowing their geometric shapes and material properties. For this reason reliability problems like malfunction or failure. comes to emerge, but the reliability test conditions to assess its performance and durability have not been founded yet. Therefore in this research failure mechanism of the eco-robot was analyzed and life test equipment which can reproduce actual usage conditions was developed. The compression levels in the life test were determined by measuring the crushing force acting on test products and Furthermore the test specimens which have equivalent shape and material properties with those of cans and PET bottles were proposed by simulating the deformation characteristics so that the actual compression conditions were set up in the test.