• Title/Summary/Keyword: Paper Sludge

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Properties of the Concrete Bricks and Interlocking Blocks Made with the Industrial By-Product (산업부산물로 제조한 콘크리트 벽돌 및 인터록킹 블록의 특성)

  • 최정호;서상교
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10a
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    • pp.179-184
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    • 2000
  • The presens study was aimed to investigate the possibility of use of pozzolanic materials such as blast furnace slag, fly ash, paper sludge ash which are produced from industrial wastes, as construction materials. Experiments were undertaken to investigate the properties of concrete bricks and interlocking blocks made with these industrial by-products. As a result, it was found that the concrete bricks and interlocking blocks made with substitute materials have equivalent strength and quality to those of conventional concrete bricks and interlocking blocks made with only cement. Thus, it could be expected that recycling the industrial wastes can reduce manufacturing costs of the cement as well as prevent environmental pollution by the use of the by-products thrown out as wastes to make secondary products of the concrete.

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Studies on the High Strength Cement Hardened Body Blended by Industrial By-Products (산업 폐부산물을 혼합재로한 고강도 시멘트 경화체의 제조 및 특성분석)

  • 연영훈;최상흘
    • Journal of the Korean Ceramic Society
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    • v.31 no.12
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    • pp.1507-1512
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    • 1994
  • High strength cement hardened body was prepared by ordinary portland cement, silica-fume, super-plasticizer and the industrial by-product powder such as tailing, paper sludge ash and granulated slag. These raw materials were mixed and formed with w/c=0.18. The cement hardened body is cured in the autoclave at 18$0^{\circ}C$, 10atm. These admixtures made the compressive strength of all specimens develope by 170~230%. The highest compressive strength could be obtained by 236 MPa when mix composition was 14 wt% of silica-fume and 26 wt% of granulated slag. The compressive strength increased with decreasing the average pore size and the amount of the poe over the size of 50 nm by which the appearance of high compressive strength of the cement hardened body were mainly influenced. In the result, the hydration products were C-S-H, tobermorite and ettringite and it was realized that the reason why the cement hardened body became dense and revealed the higher strength was that those hydrates were formed inside of the pore and filled in it and the unhydrated materials played the role of an inner-filler.

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Suitability of Coal Fly Ash and Incineration Ashes as Raw Materials for Zeolite Synthesis

  • Murayama, NorihiHo;Yamakawa, Yousuke;Ogawa, Kazuo;Takami, Yuko;Yamamoto, Hideki;Shibata, Junji
    • Proceedings of the IEEK Conference
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    • 2001.10a
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    • pp.616-620
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    • 2001
  • The objectives of this study are to investigate the suitability of various coal fly ashes and incineration ashes for zeolite synthesis. Zeolite P and hydroxysodalite are produced from coal fly ash and paper sludge incineration ash. When soluble and acid-soluble materials in incineration fly ash are removed by the water washing or acid washing before hydrothermal synthesis, hydroxysodalite can be produced. The factors to make solid-liquid separation difficult are the calcium component and the unburned carbon in ash.

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The Effects of Base Oil Quality on the Performance of GF-3 Engine Oil

  • Moon, Woo-Sik;Ryoo, Jae-Kon
    • KSTLE International Journal
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    • v.3 no.1
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    • pp.26-29
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    • 2002
  • The International Lubricant Standardization and Approval Committee (ILSAC) GF-3 passenger car engine oil specification has been introduced commercially in July 2001. The new specification oil provides superior performance in terms of fuel economy, control of high temperature deposits, and oil consumption. These enhanced performances of GF-3 engine oil need high quality base oil as well as a better additive system. In this paper, the effect of base oil on various performances of ILSAC GF-3 engine oil was investigated. From the GF-3 sequence engine tests, Group III base oil shows better performance in fuel economy retention, oxidation and varnish control than combination of group III and group II or group III and group 1.

Studies on Expression Operations of Filter Cakes (여과케이크의 압착탈수조작에 관한 연구)

  • Cho, Jun-Hyung
    • Journal of the Korean Wood Science and Technology
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    • v.18 no.1
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    • pp.3-9
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    • 1990
  • Expression is on operation of separating liquid from solid liquid mixtures which has long been used on a universal scale in widely divergent fields. In fruit pulps processing and fermentation industries. removal of a portion of the liquid in filler cake is essential to the maximum yields of products. In sewage sludge treatments, dewatering of filter cakes is important to disposal by incineration. transportation. and landfill. In the chemical process industries, drying of wet cakes increases cost, and it is desirable to eliminate as much liquor as possible by non-thermal methods. This paper is mainly concerned with the development of a simplified equation for constant-pressure expression.

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A Study on Experimental Analysis of Semi-Continuous Settling Tank using Characteristics of Solid Sedimentation in the Binary $CaCO_3$-Water Slurry (탄산칼슘-물 이성분계 슬러리의 침강 특성을 이용한 반연속식 침전탑의 실험적 해석에 관한 연구)

  • 안원술;노승백;김정배;박상원;최창균
    • Journal of Environmental Science International
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    • v.7 no.5
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    • pp.659-667
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    • 1998
  • In the present paper, batch and semi-continuous settling characteristics of a binary calcium carbonate-water system were investigated. Using experimental data of batch settling characteristics, a graphical analysis for a semi-continuous thickening column was developed and compared with experimental results on the basis of Kynch theory, only where the feed velocity line was within the limits of Kynch theorem III. The analysis showed good agreement with experiments. Quite erroneous results, however, was observed for the analysis of a sludge region on the underloaded operation, which was considered due to the deviation from the limits of theory.

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Design of a Partial Inter-tube Lancing System actuated by hydraulic power for type F model Steam Generator in Nuclear Power Plant (수압구동 전열관다발 부분 삽입형 증기발생기 세정장비 설계)

  • Kim, S.T.;Jeong, T.W.
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1132-1135
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    • 2008
  • The sludge grown up in steam generators of nuclear power plants shortens the life-cycle of steam generators and reduces the output of power plants. So KHNP(Korea Hydro and Nuclear Power), the only nuclear power utility in Korea, removes it periodically using a steam generator lancing system during the outage of plants for an overhaul. KEPRI(Korea Electric Power Research Institute) has developed lancing systems with high pressured water nozzle for steam generators of nuclear power plants since 2001. In this paper, the design of a partial inter-tube lancing system for model F type steam generators will be described. The system is actuated without a DC motor inner steam generators because the motors in a steam generator make a trouble from high intensity of radioactivity as a break down.

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The Optimal Model of Fuzzy-Neural Network Structure using Genetic Algorithm and Its Application to Nonlinear Process System (유전자 알고리즘을 사용한 퍼지-뉴럴네트워크 구조의 최적모델과 비선형공정시스템으로의 응용)

  • 최재호;오성권;안태천;황형수
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 1996.10a
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    • pp.302-305
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    • 1996
  • In this paper, an optimal identification method using fuzzy-neural networks is proposed for modeling of nonlinear complex systems. The proposed fuzzy-neural modeling implements system structure and parameter identification using the intelligent schemes together with optimization theory, linguistic fuzzy implication rules, and neural networks(NNs) from input and output data of processes. Inference type for this fuzzy-neural modeling is presented as simplified inference. To obtain optimal model, the learning rates and momentum coefficients of fuzz-neural networks(FNNs) and parameters of membership function are tuned using genetic algorithm(GAs). For the purpose of its application to nonlinear processes, data for route choice of traffic problems and those for activated sludge process of sewage treatment system are used for the purpose of evaluating the performance of the proposed fuzzy-neural network modeling. The show that the proposed method can produce the intelligence model w th higher accuracy than other works achieved previously.

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A Study on Vermicomposting Technology in Korea (국내 지렁이 이용기술 현황조사)

  • 최훈근;김규연;김종모;이창호
    • Proceedings of the Korean Environmental Health Society Conference
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    • 2001.04a
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    • pp.19-25
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    • 2001
  • Recently in Korea, treatment and disposal of organic wastes have being the mostimportant is sue due to governmental strong regulation of landfill banning Especially the sewage sludge and food wastes will be restricted from the direct landfilling, after the year 2003 and 2005 respectively. Thus the considerable change in treatment methods of organic wastes is founded to transfer toward recycling the organic wastes, In these trends. vermicomposting is being enlightened newly in Korea. In November of 1999. the first symposium focusing the organic waste treatment using the earthworm was held with attending many peoples including earthworm company, experts. and professors. In that symposium, it was reported that the vermicomposting plants treating organic wastes had increased to about 80 plants and had treated about 110,000 tons per year in Korea Many local governments and companies showed the interest in vermicomposting of organic wastes and needed the collaboration with each other and foreign countries. In for reclamation materials, the extraction of some medical drugs from earthworm was expanding the research and development fields, In this paper, the history of vermicomposting in Korea was reviewed and the present stanls and future aspect were showed.

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Modeling and Intelligent control for Wastewater treatment process (수처리공정의 모델링과 지능제어의 적용)

  • Cheon, Seong-Pyo;Kim, Bong-Chul;Kim, Sung-Shin
    • Proceedings of the KIEE Conference
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    • 2000.07d
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    • pp.2333-2335
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    • 2000
  • The main motivation of this research is to develop an intelligent control strategy for Activated Sludge Process(ASP). ASP is a complex and nonlinear dynamic system because of the characteristic of a wastewater, the change of an influent flow rate, weather conditions, and etc. The mathematical model of ASP also includes uncertainties which are ignored or not considered by process engineer or controller designer. The ASP is generally controlled by a PID controller that consists of fixed proportional, integral, and derivative gain values. The PID gains can be adjusted by the expert in the ASP. The ASP model based on Matlab$^{(R)}$5.3/Simulink$^{(R)}$3.0 is developed in this paper. Various control methods are applied to the ASP model and the control results are disscussed. Three control methods are designed and tested: conventional PID controller, fuzzy logic control approach to modify setpoints, and fuzzy-PID control method.

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