• Title/Summary/Keyword: industrial wastes

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An efficient method on two-phased guillotine cutting stock (효율적인 2단계 길로틴 평면절단 방법)

  • Kim, Sang-Youl;Park, Soon-Dal
    • IE interfaces
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    • v.8 no.2
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    • pp.151-159
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    • 1995
  • Two-dimensional cutting stock problem is to find a waste-minimizing method of cutting a single rectangular plane into a number of smaller pieces of known dimensions. In practice, besides wastes, setup cost taken during adjusting is of an important concern. We suggest 2-phased guillotine cutting method as a solution to the problem which minimize wastes and setup costs. Also, in order to reduce the computing time we apply techniques of discretization, cutoff, median. Experimental results show good performance of our algorithm.

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A Development of Landfill Liner by Utilizing Waste Lime (폐석회를 이용한 매립지 차수재 개발)

  • 김준섭;이승학;박준범
    • Proceedings of the Korean Geotechical Society Conference
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    • 1999.03a
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    • pp.521-528
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    • 1999
  • As the size of our industry and population inclose, the byproducts such as municipal solid wastes, industrial wastes are in the increasing phase. The treatment of such things is rising as a social problem. Today, the final disposal of these wastes depends mostly on the landfill, and the sanitary landfill is required and designed for preventing soil and groundwater contamination. Clays have been used for a liner material of a sanitary landfill, however, the high quality clay is hard to come by and quite expensive as a lining material in our country. Using the waste lime produced abundantly every year from chemical processes was studied here, made from the proper mixing of the bentonite and the waste lime meets the regulations from the USEPA. The soil property index tests (sieve analysis, specific gravity test Atterberg limit test) were performed, and at last to confirm the sorption characteristics of the bentonite and the waste lime the sorption isotherm equilibrium test and the sorption isotherm were performed with Toluene and Ethylbenzene which are the main components of the leachate from the landfill.

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A Study on the Scale-Up of Fluidized Bed Combustors for Low-Calorific Value Wastes (저발열량 폐기물 소각용 유동층 소각로의 Scale-Up에 관한 연구)

  • Park, S.H.;Kim, J.E.;Park, B.S.
    • Journal of the Korean Society of Combustion
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    • v.1 no.1
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    • pp.1-10
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    • 1996
  • An effective scale-up methodology of fluidized bed incinerators for low calorific value industrial wastes such as paper sludge and sewage sludge has been developed based on the similarity rules. Conventional scale-up theories are briefly reviewed and a new simple theory defining the diffusion Fourier number is established taking account of the lateral mixing of fuels in the fluidized bed. From the design and the operating conditions of the pilot FBC plant at Inchon, important design data for the full-scale incinerators are calculated and discussed.

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An Experimental Study on the Properties of the Concrete made with Blast Furnace Slag, Fly-Ash or Paper Sludge-Ash (슬래그, 플라이애쉬, 제지슬러지애쉬로 제조한 콘크리트의 성상에 관한 기초적인 실험적연구)

  • 최정호;하상욱;허왕국;고상민;노강석;정관영;서성교
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.599-604
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    • 1999
  • In recent years, problems of industrial solid wastes appear to be kind of national crises, caused by a sudden increase in their quantities, lack of disposal technique, and public discontent in installing plants for their disposal. This study is designed to investigate that pozzolana-based materials, such as blast furnace slag, fly-ash, paper sludge-ash, which are produced from industries as solid wastes, can be used as construction materials. The variations of concrete strength in function of compositional differences of raw materials including the wastes are studied experimentally. As a result, we find out that the blast furnace slag, the fly-ash, and the paper sludge-ash can be recycled as useful resources for replacement of cements by adjusting their substitution ratio.

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Landfill of Hazardous Wastes in Korea (국내 특정폐기물의 매립현황)

  • Lee, Dong-Soo
    • Applied Chemistry for Engineering
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    • v.3 no.2
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    • pp.213-223
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    • 1992
  • Although landfill has been heavily relied upon as a final hazardous waste disposal method in Korea, the legal and technical problems associated with the landfill severely hinder proper disposal of hazardous wastes. The single largest legal problem is simply that, in spite of the recent amendments, the law regulating the hazardous waste landfill is yet in its primitive stage that even the lawful landfill sites cannot be regarded safe. The technical problems include improper selection of landfill sites, poor design and construction of landfill facilities, and lack of QA/AC and post-closure cares. These technical problems stem from inexperience and lack of resources. For the reduction of the potential danger from the improper landfills of hazardous wastes, it is an immediate need to further refine the law and to resolve the technical problems.

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A Status of Agricultural Water Quality and Improvable Countermeasure in Korea (우리나라 농업용수 수질오염 현황과 개선대책)

  • Baeg, Cheong-Oh;Kang, Sang-Gu;Lee, Kwang-Sik
    • Korean Journal of Environmental Agriculture
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    • v.15 no.4
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    • pp.506-519
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    • 1996
  • The water quality in the rural areas is degrading due to a variety of causes such as the increase of the urban sewage and industrial wastes, the disposal of solid wastes, the growth of livestock waste, the growth of leisure facilities, the establishment of agricultural industry estates and etc. The water pollutants are scarce while the effluent is increasing from wide scattered sources. The technology specifically designed for the rural wastes water treatment plant needs to be implemented with improvement of agricultural water quality. 1. An integrated management measures against water pollution sources. The prevention of water pollution is the best measures in the environmental pollution. Hence, the most effective measures needs to be against the sources. Small-scale water treatment plants needs to be constructed in each village in the rural areas. As for the industrial effluent, the effluent discharge needs to be strictly monitored. Government subsidy for the establishment of treatment plant for livestock wastes is necessary. 2. The establishment of national-wide network for agricultural water quality. The network for agricultural water quality have been operated to conserve the agricultural water quality, and to develop management policies by the assessment of water pollution in the rural areas. The results of agricultural water quality network indicates that the water quality is degrading not only around urban areas but also in the distant rural areas, and the water quality at the pumping stations and weirs is worse than that of reservoirs. 3. The legal, systematic, and technical approaches for the agricultural water quality management. The actions currently implemented for the improvement of agricultural water quality involve temporary measures such as the improvement of irrigation facilities. These contingency measures are not effective in the long-term, and sometimes bring secondary pollution. Therefore, integrated measures covering the whole water environment such as the flow, quality, river morphology, aquatic ecosystem, and the surrounding environment, need be invented and implemented. Besides, the legal, systematic, and technical frameworks for the management are not fully established so far. The technology for the treatment of rural water pollution should be refined afterwards, and the research for the development of rural waste water treatment plant should be carried out.

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Sustainable SCC with high volume recycled concrete aggregates and SCMs for improved mechanical and environmental performances

  • Zhanggen Guo;Ling Zhou;Qiansen Sun;Zhiwei Gao;Qinglong Miao;Haixia Ding
    • Advances in concrete construction
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    • v.16 no.6
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    • pp.303-316
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    • 2023
  • Using industrial wastes and construction and demolition (C&D) wastes is potentially advantageous for concrete production in terms of sustainability improvement. In this paper, a sustainable Self-Compacting Concrete (SCC) made with industrial wastes and C&D wastes was proposed by considerably replacing natural counterparts with recycled coarse aggregates (RCAs) and supplementary cementitious materials (SCMs) (i.e., Fly ash (FA), ground granulated blast furnace slag (GGBS) and silica fume (SF)). A total of 12 SCC mixes with various RCAs and different combination SCMs were prepared, which comprise binary, ternary and quaternary mixes. The mechanical properties in terms of compressive strength and static elasticity modulus of recycled aggregates (RA-SCC) mixes were determined and analyzed. Microstructural study was implemented to analyze the reason of improvement on mechanical properties. By means of life cycle assessment (LCA) method, the environmental impacts of RA-SCC with various RCAs and SCMs were quantified, analyzed and compared in the system boundary of "cradle-to-gate". In addition, the comparison of LCA results with respect to mechanical properties was conducted. The results demonstrate that the addition of proposed combination SCMs leads to significant improvement in mechanical properties of quaternary RA-SCC mixes with FA, GGBS and SF. Furthermore, quaternary RA-SCC mixes emit lowest environmental burdens without compromising mechanical properties. Thus, using the combination of FA, GGBS and SF as cement substitution to manufacture RA-SCC significantly improves the sustainability of SCC by minimizing the depletion of cement and non-renewable natural resources.

Fundamental Properties of Concrete Block and Brick using Casting foundry Fly Ash (주물공장 플라이애쉬를 혼합한 콘크리트 블록 및 벽돌의 기초적 성질)

  • 김희성;진치섭
    • Journal of the Korea Concrete Institute
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    • v.13 no.2
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    • pp.87-92
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    • 2001
  • Until now, disposal of casting foundry fly ash generally depends on reclamation. This is the great loss from a point of view saving of resources and utilizing industrial wastes. Therefore, a study on the use of fly ash as a substitute material for construction is necessary in order to utilize industrial wastes, to reduce cost of production, to improve quality in producing concrete products, and to protect environment from pollution. In this study, concrete products(hollow concrete block and concrete brick) using casting foundry fly ash as a substitute materials for cement, are produced. And experiments are conducted based on Korean Industrial Standards. Finally, the used methods of casting foundry fly ash as a substitute materials in industry are presented.

Methane Production Using Peel-type Fruit Wastes and Sewage Sludge in Batch Anaerobic Digestion Process (껍질 형태의 과일폐기물과 하수슬러지를 이용한 회분식 혐기 소화공정에서 메탄 생산)

  • Jeong, Tae-Young;Lee, Jong Hak;Chung, Hyung-Keun;Cha, Hyung Joon;Choi, Suk Soon
    • Applied Chemistry for Engineering
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    • v.20 no.5
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    • pp.542-546
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    • 2009
  • Methane production using the mixed organic wastes of peel-type fruit wastes from apple or orange and sewage sludge was investigated in the batch anaerobic degradation process. When apple or orange peels with sewage sludge were used as mixed substrates, higher methane production was achieved under the condition of 3 : 7 (fruit peel : sewage sludge) mixing ratio. However, above the 3 : 7 mixing ratio, the pH of mixture was decreased from 8.0 to 4.5~4.7 due to organic acid production from the fruit wastes. Subsequently, methane production was low. The results in this study could be effectively applied to the methane gas production system as a bioenergy in the mixed batch anaerobic digestion process using the peel-type fruit wastes and sewage sludge.