• Title, Summary, Keyword: Recyclable

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The Effect of the Recycling Industry in Public Sector (공공부문 자원재활용사업의 국민경제적 효과분석)

  • Kwak, Seung-Jun;Yoo, Seung-Hoon;Ryu, Mun-Hyun
    • Environmental and Resource Economics Review
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    • v.11 no.3
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    • pp.465-491
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    • 2002
  • Korea is one of the countries which have a remarkable record of high and sustained economic growth. However, as the national economy has continued to grow and the industrial structure has become increasingly advanced, the amount of wastes being generated has been rapidly on the rise. recycling wastes to cope with the environmental problems caused by wastes has become an increasingly important policy issue in developing countries such as Korea, as well as in developed countries. This situation demands that researchers provide policy-makers with available and responsible information regarding the effect of the recycling industry in the public sector. This study employs input-output (I-O) analysis to examine the effect of public sector recycling industry in the national economy, using a specific application to Korea. The paper, therefore, has two major goals. The first is the development of a static I-O framework for looking into the effect of public sector recycling industry in the short run. The second goal is obtaining at least a preliminary indication of the effect of the recycling industry- in public sector. Moreover, we discuss the role of a public firm that established with an objective of promoting and facilitating the reutilization of recyclable wastes. The overall results indicate that the recycling utilities may have a significant influence on the standard of living and industrial production.

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The Improvement of Properties of Recycled aggregates using Concrete Waste by Pre-heating Method. (예비가열법에 의한 폐콘크리트 재생골재의 물성개선)

  • 최현수;김효열;최봉철;강병희
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.73.2-79
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    • 2003
  • The purpose of this study is to provide the basic data on the optimum method for interfacial separation for an effective recycle of concrete waste by using the thermal properties of concrete. Therefore, this study is proceeded by dividing the interface of concrete into cement paste and fine aggregates or mortar and coarse aggregate, considering the aspect of recycled cement and aggregate as the recycling use of concrete waste. As results of the experiment, in case of recycle cement, the interfacial separation is easily appeared, but it is shown that the mixed amount of powder included in fine aggregate doesn't greatly decrease. But, in case of recycle coarse aggregate, the effect of interfacial separation by preliminary heating is predominant. Especially, the bonding rate of mortar is the lowest when it is heated 5 times for 120 minutes at $300^{\circ}C$. Hence, it is considered that it will be an excellent effect of quality control when the results of this study is applied to a manufacturing system of recycle coarse aggregate which is about to put into practical use.

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Fire Retardancy and Mechanical Properties of Paper Sludge-Wood Particle Mixed Board (제지 슬러지-목재 파티클 혼합보드의 내화성과 기계적 성질)

  • Son, Jung-Il;Lee, Phil-Woo
    • Journal of the Korean Wood Science and Technology
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    • v.22 no.1
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    • pp.54-65
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    • 1994
  • This research carried out to investigate the effects of inorganic materials in paper sludge on the thermal degradation and of paper sludge addition on physical and mechanical properties of paper sludge-wood particle mixed boards in comparison with unmodified particleboards. Also these unmodified particleboards and paper sludge-wood particle mixed boards were soaked in aqueous solutions of fire-retardant chemicals(diammonium phosphate and zinc chloride), and their fire retardancy were tested by oxygen index method and ISO ignition test to determine the feasibility of paper sludge, industrial waste, as a recyclable resource in fabrication of fire-resisting panels for building material. Since the redrying of fire-retardant treated particleboards and paper sludge-wood particle mixed boards were made by press drying method, this process was a simple and effective method. On the other hand, flexural bending strength and internal bonding strength were also analysed to evaluate mechanical properties through standard method.

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Cholesterol Removal from Whole Egg by Crosslinked β-Cyclodextrin

  • Jeong, H.J.;Sun, H.;Chogsom, C.;Kwak, H.S.
    • Asian-Australasian Journal of Animal Sciences
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    • v.27 no.4
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    • pp.537-542
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    • 2014
  • This study was carried out to optimize cholesterol removal in whole egg using crosslinked ${\beta}$-cyclodextrin (${\beta}$-CD) and to recycle the ${\beta}$-CD. Various factors for optimizing conditions were concentration of the ${\beta}$-CD, mixing temperature, mixing time, mixing speed and centrifugal speed. In the result of this study, the optimum conditions of cholesterol removal were 25% crosslinked ${\beta}$-CD, $40^{\circ}C$ mixing temperature, 30 min mixing time, 1,200 rpm mixing speed and $2,810{\times}g$ centrifugal speed. The recycling was repeated five times. The cholesterol removal was 92.76% when treated with the optimum conditions. After determining the optimum conditions, the recyclable yields of the crosslinked ${\beta}$-CD ranged from 86.66% to 87.60% in the recycling and the percentage of cholesterol removal was over 80% until third recycling. However, the cholesterol removal efficiency was decreased when the number of repeated recycling was increased. Based on the result of this study, it was concluded that the crosslinked ${\beta}$-CD was efficient for cholesterol removal in whole egg, and recycling is possible for only limited repeating times due to the interaction of the ${\beta}$-CD and egg protein.

Pyrolysis oil refining by Fly-ash absorption (Fly-ash 흡착기법을 이용한 열분해유 정제)

  • Im, EunJung;Kim, SungHyun;Chun, ByungHee;SunWoo, Hwan;Jeong, IckCheol
    • 한국신재생에너지학회:학술대회논문집
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    • pp.222-222
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    • 2011
  • Plastic product is increasing by the growth of its demand and most of refused plastics are incinerated or reclaimed. However, the refused plastic is not easily decomposed and has the environmental problem with its various toxic gas in case of incineration. Therefore, many countries such as USA, Japan, Germany and other developed industrial countries as well as Korea are interested in studying the recyclable resource of refused plastic. The macromolecular waste pyrolysis has the advantage of collecting of raw materials in high price and can at least get fuel gas or oil with high heat capacity. It also discharges low waste gas and low toxic gas including SOx, NOx and HCl heavy metals. However, pyrolyzed oil includes enough excess unsaturated hydrocarbons to form tar, which can cause the nozzle of engines to plug when pyrolyzed oil is used as fuel. Activated carbon was proven to have prominent adsorption capability among the other adsorbents that were mainly composed of carbon. This study examined the possibility of application in activated charcoal of its solid formation by analysing the feature of pyrolysis which is one of the chemical recycling methods and getting chemical analysis of the product and activated energy. Analyze the element of the oil produced by pyrolysis using GC-MS. The experiment of tar adsorption using fly-ash showed that fly-ash improved the optical intensity of pyrolyzed oil and decreased oxygen compounds in the pyrolyzed oil.

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$CO_2$ adsorption over zinc oxide impregnated NaZSM-5 synthesized using rice husk ash (왕겨회재를 이용하여 합성된 NaZSM-5의 zinc oxide 함침에 의한 이산화탄소 흡착)

  • Hemalatha, Pushparaj;Ganesh, Mani;Venkatachalam, Kandan;Peng, Mei-Mei;Lee, Sung-Yong;Jang, Hyun-Tae
    • Proceedings of the KAIS Fall Conference
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    • pp.327-331
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    • 2011
  • Zinc oxide (5, 10 and 15 wt%) impregnated NaZSM-5 zeolite synthesized using rice husk ash as silica source was tested for $CO_2$ adsorption. The materials were characterized by XRD, SEM-EDS, $CO_2$-TPD and BET techniques. The heat of the reaction (${\Delta}$Hr) derived from DSC for ZnO(10%)/NaZSM-5 was found to be 495 Btu/lb and the maximum $CO_2$ adsorption capacity of ZnO(10%)/NaZSM-5 is 140 mg/g of sorbent. Extraction of silica from the agricultural waste, rice husk and its use in the zeolite synthesis is an added advantage in this study. Hence, from the study it is concluded that zinc oxide impregnated NaZSM-5 could be treated as novel material for $CO_2$ adsorption as they were found to be regenerable, selective and recyclable.

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Trend on Technology Development of Bioenergy from Woody Biomass (목질계 바이오매스를 이용한 바이오에너지 기술개발 동향)

  • Kwon, Gu-Joong;Kim, Nam-Hun
    • Journal of Forest and Environmental Science
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    • v.25 no.2
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    • pp.131-138
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    • 2009
  • Recently, various efforts for the extended utilization of woody biomass has been attempted due to the fact that global warming, energy and environmental problems are urgent ones to be solved. Development of new energy sources at our national security level is desperately needed as we depend on almost all of energies supplied from other countries, let alone the economic crisis caused by oil price hike. Woody biomass can be converted to energy by means of thermochemical, biological, or direct combustion processes. Many processes are available for producing bioenergy, such as bioethanol, wood pellet, wood chip, combined heat, and power system. Political support and R&D investment should be provided that can boost the utilization of the wood biomass, the eco-environment, and recyclable and alternative energy resources for national power security. In addition, a long-term strategy that can utilize unused and low efficient woody biomass resources, and systematically collect and manage them in a national level should be set up. Even though the possibility in total exchange of fossil oil with woody biomass is quite low, technology developments of woody biomass for the solution to global warming and environmental problem through its commercialization are expected to grow steadily.

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Synthesis of Li-Zr incorporated mesoporous $TiO_2$ and its application in $CO_2$ adsorption ($TiO_2$ 담지체에 합성된 Li-Zr 메조포러스 분자체 ; 이산화탄소 흡착 응용)

  • Bhagiyalakshmi, Margandan;Peng, Mei Mei;Hemalatha, Pushparaj;Ganesh, Mani;Jang, Hyun-Tae
    • Proceedings of the KAIS Fall Conference
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    • pp.110-114
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    • 2010
  • Li-incorporated mesoporous $TiO_2$ materials with various pore-sized istributions were synthesized by using triblockcopolymers via a sol-gel process in a queous solution. The properties of the se materials were characterized by HR-TEM, XRD, and BET analysis. All particles have spherical morphology with a diameterrange of $1-3{\mu}m$. The mesoporous $TiO_2$ materials calcined at $400^{\circ}C$ and their specific surface area, average pore size and crystallite sizes were 210 $m^2g^{-1}$, 6.4 nm and 8.8 nm respectively. The Li-incorporated mesoporous $TiO_2$ were tested for $CO_2$ adsorption and its adsorption capacity is 90mg/g. The Li-incorporated mesoporous $TiO_2$ ar eobserved to be thermally stable, recyclable and greens or bent for $CO_2$ capture. The effect of bimetallic $ZrLiTiO_2$ is also studied for $CO_2$ adsorption.

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Li, Zr doped mesoporous silica: One pot synthesis and its application to $CO_2$ adsorption at low temperature (Li, Zr 담지 메조포러스 실리카 합성 : One pot 합성 및 저온 이산화탄소 흡착 응용)

  • Ganesh, Mani;Bhagiyalakshmi, Margandan;Peng, Mei Mei;Hemalatha, Pushparaj;Jang, Hyun-Tae
    • Proceedings of the KAIS Fall Conference
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    • pp.313-317
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    • 2010
  • Li, Zr doped mesoporous silica was synthesized in one pot and investigated for low temperature $CO_2$ adsorption. Herein CTAB and TEOS are used as structural directing agent and silica source respectively. The characteristics of the material was obtained from FT IR, XRD, SEM, TG and BET results. ICP AES results revealed the presence of lithium and zirconium. The material possesses high surface area ($962.22m^2g^{-1}$) with mono dispersed particles of about 2 nm. The maximum $CO_2$ adsorption capacity is 5 wt % (50 mg/g) of $CO_2$/g of sorbent at $25^{\circ}C$, which is regenerable at $200^{\circ}C$. This regeneration temperature of the adsorbent is lower than the reported lithium zirconium silicate powder. Until now, there is no report for the synthesis of Li, Zr doped mesoporous silica. The performance studies illustrate that Li, Zr doped mesoporous silica is tunable, regenerable, recyclable and selective sorbent and hence found to be a promising candidate for $CO_2$ adsorption.

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$CO_2$ adsorption on ceria impregnated (Ce 담지 NaZSM-5의 이산화타소 흡착 특성)

  • Hemalatha, Pushparaj;Ganesh, Mani;Bhagiyalakshmi, Margandan;Peng, Mei Mei;Jang, Hyun-Tae
    • Proceedings of the KAIS Fall Conference
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    • pp.318-322
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    • 2010
  • NaZSM 5 was synthesized in an alkaline medium and impregnated with cerium oxide by wet method using cerium nitrate as the source for cerium. There TGA results shows decomposition of nitrate at $200^{\circ}C$. The ceria impregnated ZSM 5 materials were designated as NaZSM 5 (X) where X is the percent ceria impregnated (3, 5, 7, 11, 19%). They were characterized by XRD, SEM, EDAX, BET techniques. XRD analysis showed decrease in intensity of the patterns with the increase in the ceria loading but crystallization of ceria to larger size is evident for 11 and 19% loading. The surface area and pore volume decreased with increase in ceria loading. The maximum adsorption capacity of NaZSM 5 (5%) is 100.2 mg/g of sorbent. The ceria impregnated NaZSM 5's were found to be regenerable, selective and recyclable.

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