• Title/Summary/Keyword: industrial wastes

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A Study on the Carbon Composite Briquette Iron Manufacturing Using Fe-containing Process Wastes (함철부산물을 활용한 탄재 내장 단괴 제조에 관한 연구)

  • Yu, Jong Yeong;Yang, Dae Young;Shin, Hee Dong;Sohn, Il
    • Resources Recycling
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    • v.24 no.3
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    • pp.34-43
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    • 2015
  • Raw materials in steel industry decide on the productivity, quality and price competitiveness. Utilizing iron-containing by-products as raw materials for steel products can save the cost of cleaning up iron-containing by-products and solve environmental issues. Iron-containing by-products have a small particle size. If they are directly inserted in a steel making process, it cause a problem such as poor heat flow and scattering. To solve these problems and induce the additional reduction, study concern with iron ore-coal mixed briquette technique are conducted by many researchers. In this paper, method of making carbon composite briquette iron(CCBI) using iron-containing by-products was studied. The effect of composition of Fe-containing process wastes, reducing agent, flux and binder on formability of CCBI (carbon composite briquette iron) was measured.

Environmental Degradation Index for the Reduction of Packing Wastes (포장 폐기물 감량을 위한 환경저해지수 제안)

  • Hong, Ho-jin;Cho, Hyun-min;Choi, Seong-Hoon
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.43 no.1
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    • pp.26-33
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    • 2020
  • The plastic waste problem is deepening all over the world. Plastic wastes have serious impacts on our lives as well as environ- mental pollution. The production and use of plastics increases every year, but once they are produced, they usually roam the earth for hundreds or thousands of years to pollute the environment. Although there is growing interest in plastic issues around the world and environmental regulations are being tightened, but no clear solution has yet been found. This study suggests Environmental degradation index (EDI). EDI can help raise consumers' attention to plastic wastes. In addition, EDI will contribute to reduce them in the future. As far as we know, this is the first study. We developed EDI for the confectionery packaging. This study defines four factors that may affect the environment of confectionery packaging: greenhouse gas emissions, energy consumption, methane emissions, and packaging space ratio. Then we quantify the value of each element and compute EDI as the sum of the four component values. In order to evaluate the feasibility of EDI proposed in this study, confectionery-packaging materials distributed in Korea were collected and analyzed. First, the types of confectionery are classified into pies, biscuits, and snacks and basic data was collected. Then the values of the four components were calculated using existing research data on the environment. We can use the proposed EDI to determine how much a product packing affects the environment.

A Study on the Current Practice in Eco-Industrial Development (자원 순환형 산업개발의 유형 연구)

  • Moon, Seogwoong
    • Environmental and Resource Economics Review
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    • v.12 no.2
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    • pp.347-382
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    • 2003
  • The paper presents available options that Korea can adopt in an effort to promote eco-industrial development in a near future. What is missing and the reasons why Korea is behind the other countries in the area are: 1) Lack of holistic view and the integrated approach toward economy and environment in policy implementation, 2) Lack of understanding, among entrepreneurs, of the concept of productivity per input resource, and the fact that not only labor and capital productivity but also the total productivity enhancement is vital for industry's competitive edge; There has been no driving force in the market to develop economies of system integration to turn industrial wastes to valuable input resources, 3) Unsupportive regulatory system regarding the trade of by products, and 4) Lack of financing and incentive mechanism. 5) Lack of information forum. Regulatory reform should be taken for the direction that in effect increase the price of disposal and motivate firms to seek symbiotic relationship with other firms, and facilitate trade by-product between firms. Financing and incentive mechanism should be introduced in order for the industry to find easy access to the opportunities for organizing the network to transform wastes in negative value to the value added resources. Also information network should be established to provide a market for by-product exchange and public education to improve industry's environmental performance.

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POLLUTION PREVENTION : ENGINEERING DESIGN AT MACRO-, MESO-, AND MICROSCALES

  • Allen, David T.
    • Clean Technology
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    • v.2 no.2
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    • pp.51-59
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    • 1996
  • Billions of tons of industrial waste are generated annually in industrialized countries. Managing and legally disposing of these wastes costs tens to hundreds of billions of dollars each year, and these costs have been increasing rapidly. The escalation is likely to continue as emission standards become even more stringent around the world. In the face of these rapidly rising costs and rapidly increasing performance standards, traditional end-of-pipe approaches to waste management have become less attractive. The most economical waste management alternatives in many cases have become recycling of the waste or the redesign of chemical processes and products so that wastes are prevented or put to productive use. These strategies of recycling or reducing waste at the source have collectively come to be known as pollution prevention. The engineering challenges associated with pollution prevention are substantial. This presentation will categorize the challenges in three levels. At the most macroscopic level, the flow of materials in our industrial economy, from natural resource extraction to consumer product disposal, can be redesigned. Currently, most of our raw materials are virgin natural resources that are used once, then discarded. Studies in what has come to be called industrial ecology examine the material efficiency of large-scale industrial systems and attempt to improve that efficiency. A second level of engineering challenges is found at the scale of individual industrial facilities, where chemical processes and products can be redesigned so that waste is reduced. Finally, on a molecular level, chemical synthesis pathways, combustion reaction pathways, and other material fabrication procedures can be redesigned to reduce emissions of pollution and unwanted by-products. All of these design activities, shown in Figure 1, have the potential to prevent pollution. All involve the tools of engineering, and in particular, chemical engineering.

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A Study on the Elution Characteristics of Heavy Metals from the Industrial Sludges by the Variation of pH (pH 변화에 따른 산업종류별 오니류의 중금속 용출특성에 관한 연구)

  • 박종환;정문식
    • Journal of Environmental Health Sciences
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    • v.20 no.2
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    • pp.14-21
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    • 1994
  • This study was carried out to find out the elution characteristics of 4 kinds of sludges and a dust by the variation of pH. Four kinds of sludges were obtained from the Industrial wastes, and the dust, from the iron-and-steel waste. These samples were analyzed by "Official Method for Waste", and the results were summarized as follows. 1. The amounts of heavy metals The concentrations of Cu were 1,940

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Material Performance Evaluation of Ceramic Fiber Reinforced Concrete using Energetically Modified Industrial By-products (산업부산물의 활성분체 및 세라믹섬유 혼입 콘크리트의 재료성능 평가)

  • Choi, Seung Jai;Yang, Dal Hun;Lee, Tae Hee;Kim, Jang Ho Jay
    • Ecology and Resilient Infrastructure
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    • v.5 no.3
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    • pp.118-124
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    • 2018
  • Social infrastructures and industrial complexes have been actively constructed in South Korea since the 1960 s as part of the economic development plan, resulting in rapid industrialization. However, side-effects due to the industrialization have occurred. An increase in industrial by-products or wastes is a typical problem. Although some industrial by-products are recycled in Korea as well as worldwide, some wastes are landfilled or dumped in the sea. Although many researchers have executed various technologies for the disposal of industrial wastes, economic and environmental technologies have not been developed. Thus, this study aims to activate paper and fly ashes during the crush process to overcome the drawback of simple concrete mixed with paper and fly ashes, which cause a reduction in workability and strength, derive an optimal content and replacement ratio of concretes mixed with Energetically Modified Material (EMM), and evaluate the material performance. In addition, the basalt fiber is mixed simultaneously to achieve the reduction of cracks and improve the tensile strength.

Heuristic Algorithms for Capacitated Collection Network Design in Reverse Logistics

  • Kim, Ji-Su;Lee, Dong-Ho
    • Management Science and Financial Engineering
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    • v.14 no.2
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    • pp.45-66
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    • 2008
  • Refuse collection, one of important elements in reverse logistics, is an activity rendering recyclables or wastes and moving them to some points where further treatment is required. Among various decisions in the collection activity, we focus on network design, which is the problem of locating collection points as well as allocating refuses at demand points to collection points while satisfying the capacity restriction at each collection point. Here, the collection point is the place where recyclables or wastes near the point are gathered, and locating the collection points is done by selecting them from a given set of potential sites. The objective is to minimize the sum of fixed costs to open collection points and transportation costs to move refuses from demand points to collection points. An integer programming model is developed to represent the problem mathematically and due to the complexity of the problem, two types of heuristics, one with simultaneous and the others with separate location and allocation, are suggested. Computational experiments were done on test problems up to 500 potential sites, and the results are reported. In particular, some heuristics gave near optimal solutions for small-size test problems, i.e., 2% gaps in average from the optimal solution values.

Generation and Physico-Chemical Characteristics of Municipal Solid Wastes generated in Chunchon for Sanitary Management (춘천시 생활쓰레기의 위생관리를 위한 배출 및 이·화학적 특성)

  • Rim, Jay-Myoung;Kang, Sung-Hwan;Han, Dong-Joon;Kim, Byeoung-Ug
    • Journal of Industrial Technology
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    • v.17
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    • pp.37-42
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    • 1997
  • Generation and physico-chemical characteristics of municipal solid wastes are very important for sanitary management. However, that has not been investigated so far especially in chunchon. And so, we tried to examine many things in detail. It was resulted that density was $90{\sim}94kg/m^3$ in school and office zone and $290{\sim}298kg/m^3$ in apartment and market place. The compositional weight fraction was food, 40~54%, paper, 14~18%, vinyl and prastic, 14~20% in house zone and market place and paper, 42~70% in school and office zone. Moisture was estimated to be 54~57% in independent house zone, apartment and market place and 11~23% in school and office zone. And three composition was water content, 44.1%, incineration particle, 11.2%, volatile parts, 44.7% in respectively. That is because of seasonal effects and regional chracteristics. In the results of chemical composition and caloric value analysis, carbon(C) was 80% in vinyl and plastic and oxygen(O) was 54.4% in paper.

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The application of Lean Six Sigma Methodology for Improving Operation in Distribution Center (물류센터 운영 개선을 위한 Lean Six Sigma 기법 적용)

  • Park, Sang-Min;Lee, Bum-Woo
    • Journal of the Korea Safety Management & Science
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    • v.9 no.3
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    • pp.95-102
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    • 2007
  • Nowadays, globally high-grade companies have done their best for increasing their competitive power through a many kinds of method in incisive competition for making certain of a pacesetting position. Among the rest, Six Sigma have been the best methodology of improving process and have proven to be effective by the result of improving process in many of manufacturing business, however, it has not obtained excellent results in the transaction business. In transaction business, a $30\sim50%$ costs in total costs is generated by slow-speed working and reworking. The slow processes decrease the quality and increase the cost, which decreases customer satisfaction, and finally the income is decreased. All of them are so called wastes in processes. For this, adopting of lean six sigma methodology in process management can eliminate the wastes and reduce the variation. This study focuses on distribution with the domains like capacity, layout, amount of location, assignment of product, operation procedure and operation rule in order to improve these domains, we make a further application of eight analysis ways based on DMAIC method for improving operation of processes of distribution center as the third profit source. The goal of this study is to trace an approach that can easily adopt of Lean Six Sigma in operational management of distribution center by a kind of data, analysis method and template.