• Title/Summary/Keyword: Recycling

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A Study on the Environmentally-friendly Design Techniques Extract and Applying Modern of Traditional Residential Area - The Case of Dokrakdang in Kyungbuk Province - (전통주거공간의 환경친화적 설계기법 추출 및 현대적 적용 - 경상북도 독락당을 사례로 -)

  • Heo, Jun;Song, Byeong Hwa
    • Journal of the Korean Institute of Traditional Landscape Architecture
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    • v.29 no.2
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    • pp.63-72
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    • 2011
  • The aim of this study, a traditional residential area in the environmentally friendly design techniques to identify the techniques and principles that have been carried out to reestablish the principles. To do this, through literature review environmental performance is reflected in the traditional residential area side of resources conservation, locational aspects, spatial configuration, and how cases were selected looking for ways to apply modern. Are examples of upper class housing in the Chosen Dynasty Period period construction relatively well-preserved round and a good building with a clear housing Dokrakdang year were selected. Locational aspects of the terrain with minimal changes to the building and construction techniques were entirely in terms of environmental conservation and environmental temperature was adjusted to regulate the room temperature technique could be seen. In terms of cycling in natural materials were recycled. and water make used of positive through water cycling technique & water control. In addition, the importance of landscape views overlooking the landscape from inside to outside through the regulation of the various internal and external space technique was used to attract and expand. Traditionality in the pursuit of modern space, simply cut off because of tradition rather than to restore or recover the organizing principle inherent in the traditional space, and extraction of the contemporary social, cultural and environmental understanding of space is acceptable in basis. Environmentally-friendly design techniques in a traditional residential area for a long time to be developed by the experience of its application of modern environmental and energy problems and pleasant environment to the creation of human life and are subject to significant swings in that.

Analysis of Bulking Agent Reduction Effect by using Previously Produced Compost (생산퇴비 재사용을 통한 수분조절재 절감효과 분석)

  • Lee, Min-Ho;Phonsuwan, Malinee;Moon, Byeong-Eun;Wang, Eun-Chul;Kim, Hyeon-Tae
    • Journal of agriculture & life science
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    • v.51 no.4
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    • pp.139-147
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    • 2017
  • This study was carried out in order to reduce the amount of sawdust for recycling the generated manure from livestock farms, and to investigate the effects on the reducing usage of sawdust and quality of produced compost. To do this, a cylindrical horizontal composting device were used in the experiments and compost was analyzed for judging produce compost quality. The experiment was carried out separately under different cases of operational control conditions. The first case was produced by using sawdust and pig manure mixture(Test-1); the second case was produced by using sawdust, pig manure and the previously produced compost(Test-2). In the second case, Except for some heavy metal content, The water content and C/N ratio were found to be suitable for fertilizer process specification of the RDA(Rural Development Administration) and it was found to reduce the sawdust 1.25tons usage.

Improvement of Acid Digestion Method by Microwave for Hazardous Heavy Metal Analysis of Solid Refuse Fuel (고형연료제품의 유해중금속 분석을 위한 마이크로파 산 분해법의 개선)

  • Yang, Won-Seok;Park, Ho-Yeun;Kang, Jun-Gu;Lee, Young-Jin;Lee, Young-Kee;Yoon, Young-Wook;Jeon, Tae-Wan
    • Journal of Korea Society of Waste Management
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    • v.35 no.7
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    • pp.616-626
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    • 2018
  • The quality standards of solid refuse fuel (SRF) define the values for 12 physico-chemical properties, including moisture, lower heating value, and metal compounds, according to Article 20 of the Enforcement Rules of the Act on Resource Saving and Recycling Promotion. These parameters are evaluated via various SRF Quality Test Methods, but problems related to the heavy metal content have been observed in the microwave acid digestion method. Therefore, these methods and their applicability need improvement. In this study, the appropriate testing conditions were derived by varying the parameters of microwave acid digestion, such as microwave power and pre-treatment time. The pre-treatment of SRF as a function of the microwave power revealed an incomplete decomposition of the sample at 600 W, and the heavy metal content analysis was difficult to perform under 9 mL of nitric acid and 3 mL of hydrochloric acid. The experiments with the reference materials under nitric acid at 600 W lasted 30 minutes, and 1,000 W for 20 or 30 minutes were considered optimal conditions. The results confirmed that a mixture of SRF and an acid would take about 20 minutes to reach $180^{\circ}C$, requiring at least 30 minutes of pre-treatment. The accuracy was within 30% of the standard deviation, with a precision of 70 ~ 130% of the heavy metal recovery rate. By applying these conditions to SRF, the results for each condition were not significantly different and the heavy metal standards for As, Pb, Cd, and Cr were satisfied.

A study on a power plant using Dye-sensitized solar cells in low light environments (저조도 환경에서의 염료감응형 태양전지를 활용한 발전소자에 관한 연구)

  • Kim, Sun-Geum;Baek, Sung-June
    • Journal of IKEEE
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    • v.25 no.2
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    • pp.267-272
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    • 2021
  • Recently, attention has been focused on renewable energy and carbon neutrality to resolve fossil energy depletion and environmental problems. In addition, high-rise urban buildings and an increase in building energy are rapidly increasing. There are many restrictions on installing solar power in urban areas. In addition, as buildings become taller, a lot of low-light environments in which shade is formed occur. Therefore, in this study, we intend to develop a power plant capable of generating electric power in an outdoor low-light environment and indoor lighting environment. The power plant in a low-light environment used a dye-sensitized solar cell. A unit cell and a 20cm×20cm module were manufactured, and the electrical characteristics of the power plant were measured using light sources of LED, halogen lamp, and 3-wavelength lamp. The photoelectric conversion efficiency of the unit cell was 17.2%, 1.28%, 19,2% for each LED, halogen lamp, and 3-wavelength lamp, and the photoelectric conversion efficiency of the 20cm×20cm module was 10.9%, 8.7%, and 11.8%, respectively. In addition, the maximum power value of the module was 13.1mW, 15.7 mW, and 14.2 mW for each light source, respectively, confirming the possibility of power generation in a low-light environment

Facilitated Transport Membranes Based on PVA-g-PAA Graft Copolymer (PVA-g-PAA 가지형 공중합체 기반 촉진수송 분리막)

  • Park, Min Su;Kang, Miso;Park, Bo Ryoung;Kim, Jeong-Hoon;Kim, Jong Hak
    • Membrane Journal
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    • v.31 no.3
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    • pp.212-218
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    • 2021
  • It is inevitable to generate incomplete combustion gases when mankind utilizes fossil fuels. From this point of view, gas separation process of combustion gas suggests the possibility of recycling CO gas. In this study, we fabricated a facilitated transport polymeric composite membrane for CO separation using AgBF4 and HBF4. The copolymer was synthesized via free-radical polymerization of poly(vinyl alcohol) (PVA) as a main chain and acrylic acid (AA) monomer as a side chain. The polymer synthesis was confirmed by FT-IR and the interactions of graft copolymer with AgBF4, and HBF4 were characterized by TEM. PVA-g-PAA graft copolymer membranes showed good channels for facilitated CO transport. In this perspective, we suggest the novel approach in CO separation membrane area via combination of grafting and facilitated transport.

Strength and Earth Pressure Characteristics of Industrial Disposal Flowable Filling Materials Utilizing Backfiller (뒤채움재로 사용된 산업폐기물 유동화 처리토의 강도 및 토압특성)

  • Bang, Seongtaek
    • Journal of the Korean GEO-environmental Society
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    • v.22 no.3
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    • pp.5-13
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    • 2021
  • Due to population growth and industrial development, the amount of industrial waste is increasing every year. In particular, in a thermal power plant using finely divided coal, a large amount of coal ash is generated after combustion of the coal. Among them, fly ash is recycled as a raw material for cement production and concrete admixture, but about 20% is not utilized and is landfilled. Due to the continuous reclamation of such a large amount of coal ash, it is required to find a correct treatment and recycling plan for the coal ash due to problems of saturation of the landfill site and environmental damage such as soil and water pollution. In recent years, the use of a fluid embankment material that can exhibit an appropriate strength without requiring a compaction operation is increasing. The fluid embankment material is a stable treated soil formed by mixing solidifying materials such as water and cement with soil, which is the main material, and has high fluidity before hardening, so compaction work is not required. In addition, after hardening, it is used for backfilling or filling in places where compaction is difficult because higher strength and earth pressure reduction effect can be obtained compared to general soil. In this study, the possibility of use of fluidized soil using high water content cohesive soil and coal ash is considered. And it is intended to examine the flow characteristics, strength, and bearing capacity characteristics of the material, and to investigate the effect of reducing the earth pressure when applied to an underground burial.

Study on the Correlation between Quality of Cement and Amount of Alternative Fuels used in Clinker Sintering Process (시멘트 클링커 소성공정 대체연료 사용량과 시멘트 품질간 상관관계 연구)

  • Choi, Jaewon;Koo, Kyung-Mo;You, Byeong-Know;Cha, Wan-Ho;Kang, Bong-Hee
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.9 no.1
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    • pp.75-84
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    • 2021
  • In this study, the correlation between cement quality(chemical composition, mineral composition, and compressive strength) and amount of waste alternative fuels used in the cement manufacturing process and was investigated. Cement manufacturing facility using coal, soft plastics(plastics that are easily scattered by wind power, such as vinyls), hard plastics(plastics that do not contain foreign substances, waste rubber, PP, etc.) and reclaimed oil was analised. Data was collected for 3 years from 2017 to 2019 and let the amount of fuels used as an independent variable and cement quality data as a dependent variable. As a result, depending on the type and quality of the alternative fuel has not a significant effect on the chemical composition(Cl and LSF) and mineral composition(f-CaO, C3S contents). Contrary to the concern that the compressive strength of cement would decrease, there was a significant positive correlation between amount of alternative fuel used and cement compressive strength.

Field Applicability Evaluation of Control Low Strength Materials as Utilizing Various Industrial by-Products (공동충전재로써 각종 산업부산물을 활용한 CLSM의 현장적용 가능성 평가)

  • Liao, Xiao-kai;Kim, Dong-Hun
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.8 no.4
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    • pp.387-394
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    • 2020
  • In this research, a physical property test of CLSM, which can safely and effectively utilize a great number of industrial byproducts and waste types, was used to review the applicability of GBFS, FNS, and FGB, as well as their field applicabilities as cavity fillers, and the following conclusions have been reached. first, For CLSM utilizing GBFS, FNS, and FGB, it was revealed that a proper mixing of over 30% of GBFS and FNS or within 5% of FGB is effective in improving the fluidity for field application. second, It was revealed that GF15B5 can suppress bleeding at a similar level as the base, whereas GF30B5 can do so at about 0.17% compared to the base. It was also verified that GF15, GF30, and GF45 can suppress bleeding at about 0.2%, 0.26%, and 0.3%, respectively, compared to the base. third, Both GF15B5 and GF30B5 exceeded 0.4MPa in 7day strength tests to satisfy the field application and, also, the rates of increase of their initial strengths were found to be 323% and 233% higher than the base, respectively. Meanwhile, the 7day strength test of GF, which utilizes GBFS and FNS, also reached over 0.2MPa for field application, and it was revealed that GF15, GF30, and GF45 show 160%, 237%, and 185% higher strength increase rates, respectively, compared to the base.

Investigation on Fire Resistance of Mortar Made of Powder Type Sericite (분말형 견운모를 혼입한 모르타르의 내화성능 연구)

  • Park, Ji-Yeon;Kim, So-I;Kim, Seong-Ha;Lee, Jae-Yong;Chung, Chul-Woo
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.9 no.1
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    • pp.26-32
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    • 2021
  • Powder type sericite has been actively researched in the area of chemistry and mineralogy in terms of waste recycling. It is a material that can be obtained relatively inexpensively with a low thermal conductivity like general mica, so in order to improve the thermal conductivity of the mortar, powder type sericite was used in this work. Compressive strengths of mortar before and after high temperature exposure were compared and evaluated to determine the fire resistance of mortar with powder type sericite. According to the experimental results, it was found that the compressive strength decreased when powder type sericite was replaced with cement, but the decrease in compressive strength with the increasing amount of powder type sericite was insignificant. When powder type sericite was incorporated, the thermal conductivity decreased, and the residual strengths of the mortar specimens which were heat treated at 600℃, 900℃, and 1,200℃ were higher than that of plain mortar. From the comprehensive evaluation of the experimental results, it can be concluded that the powder type sericite has the potential to be used as a refractory material for cement composites.

A Study on the Characteristics of Disaster Temporary Sheltering in Terms of Sustainable Design -Focused on the Case of the Wenchuan Earthquake in Sichuan Province- (지속가능성 측면에서 재난 임시대피소의 특성 연구 -쓰촨성(四川省) 원촨(汶川) 지진 사례를 중심으로-)

  • Tian, Hui;Yoon, Ji-Young;Wang, Dan
    • The Journal of the Korea Contents Association
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    • v.21 no.5
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    • pp.877-888
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    • 2021
  • This study used three types of temporary shelters, tents, and prefabricated houses provided by the Chinese government for victims after the Wenchuan earthquake in 2008 as case study objects. Through literature review, 12 evaluation items were selected from the social, economic, and environmental elements of the sustainability of residential space design to analyze and evaluate three types of temporary shelters, and derive their respective characteristics and problems. The analysis results show that the temporary centralized settlements and tents had problems such as imperfect infrastructure, poor sanitation, narrow living space, no personal space, and inconvenience in life. Prefabricated houses had problems such as high construction costs, non-environmentally friendly building materials, occupation of arable land, low recycling rate of materials, and environmental pollution by waste. The common problem of the three types of shelters was that the government took the lead in the construction and distribution of shelters, and the disaster victims passively accept government support. Therefore, disaster victims were not actively involved in the construction and management of temporary communities. Secondly, the designs of all three types of temporary shelters did not fully consider the psychological needs of the victims, especially the need for safe and hygienic personal space. Finally, this research proposes improvement plans for the problems in the sustainable design of three temporary shelters and the construction and management of temporary communities.