• Title/Summary/Keyword: reuse system

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A Development of Computerized Management System for Deconstruction (분별해체공사 통합관리 시스템의 개발)

  • Kim, Hyo-Jin;Kim, Chang-Hak
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2004.11a
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    • pp.638-641
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    • 2004
  • This study suggests the optimum deconstruction management system for minimizing construction waste and increasing reuse and recycle rate of material to be different from traditional demolition. The purpose of this system is to minimize environmental damages and reduce construction waste quantity of a country by planning and operating preliminarily estimation of demolition quantity, demolition methods of each structural elements and reuse or recycle methods of C&D waste. This system is consist of four modules such as planning of preliminary demolition survey, estimating of demolition quantity, planning of demolition schedule and planning of construction waste management, and these all modules can be used individually module according to user's utilization purpose.

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Reuse of the sewage from sea area using the Submerged Moving Media Complete Mixing Activated Sludge (SMMCMAS) (회전매체를 가진 완전혼합활성슬러지 공법을 이용한 온천지구 하수의 재이용)

  • 김홍태;김학석
    • Journal of Environmental Science International
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    • v.11 no.1
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    • pp.69-74
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    • 2002
  • This study was performed to evaluate an applicability of the SMMCMAS system for reuse of the sewage from spa area and was operated to HLR(Hydraulic loading rate) of 211.3 to 126.8 $\ell$/㎥/d. The operating HRT(Hydraulic retention time) ranges were 2.5 to 1.5 hours. Conclusions are as follows; At the optimum HLR of 158.5 $\ell/\m^2$/d (HRT of 2.0 hours), the maximum BOD removal efficiency was 94% and the effluent BOD concentration was 1.1mg/$\ell$ in result. As the HLR was increased to 211.3 $\ell/\m^2$/d, BOD removal efficiency was decreased to 75% and BOD removal efficiency was also reduced to 74% at lower HLR of 126.8 $\ell/\m^2$/d. It shows that the maximum BOD removal efficiency occurs at an optimum HLR value and that the removal efficiency decreases when the HLR is either higher or lower than the optimum value. Sludge production rates were ranged 0.01 to 0.24gVSS/gBODrem/d and accomplished to 0.01gVSS/gBODrem/d at the optimum HLR of 158.5 $\ell/\m^2$/d.

A Study on the Environmental Impact of Biological Production Facilities (대규모 생물생산 시설의 환경 영향 연구)

  • 남상운
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.38 no.5
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    • pp.106-115
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    • 1996
  • This study was carried out to provide fundamental data for reuse of resources and prevention of environmental pollution Actual states of environmental pollution by biological production facilities were investigated. Various pollution loads and quantity of wastes from greenhouse and animal housings estimated. In greenhouse contents of investigation were wastes of plastic cover, noise of heater and fan, air pollutant of heater, and wastes of soilless culture system, etc. In animal housings, those were actual state of livestock waste treatment and reuse, pollutant mass unit discharge, noise pollution, and malodorant, etc. The main pollutants discharged from greenhouses were wastes of plastic cover, rockwool, and waste fluid of nutrient solution. Developments of waste disposal methods for plastic cover and rockwool are required. And recycle technique of nutrient solution for soilless culture should be developed and propagated. With the buildup of legal control, pollutant mass discharged from livestock wastes are, on the decrease. The other side, reuse of livestock excreta increased. Most animal housings are located near the dwelling house. Malodorant and noise from animal housings have bad effects on the rural living conditions. So developments of integrated complex for small scale livestock farms are required.

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A Construction Method of the Software Reuse Framework using Behavior Patterns (행위패턴을 이용한 소프트웨어 재사용 프레임워크 구축방법)

  • Lee, Gi-O;Ryu, Seong-Yeol
    • The Transactions of the Korea Information Processing Society
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    • v.6 no.8
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    • pp.2088-2097
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    • 1999
  • We propose the software framework construction method that increases reusability through use case extraction and structuring of software system's dynamic behavior of which identifying behavior patterns from software domain models. Most behavior models do not provide a consistent modeling technique for harmonizing user's heterogeneous requirements, and not yet prepared to a detailed optimizing technique for redevelopment and maintenance. Therefore, we need a software reuse framework to support consistency and reusability of existing development models using use cases with functional characteristics. a lattice model is used to this approach for structuring use cases, and the reuse process that can be driven to reusable components is introduced in this paper,.

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Methods for the Reduction of Consumption and Contamination of Water in a Newsprint Mill by Using Simulation Model and WRDF (전산모사기법과 WRDF를 활용한 ONP 재활용 공정의 용수 및 오염부하 절감 방안에 관한 연구)

  • 이영애;류정용;성용주;김용환;송재광;송봉근;서영범
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.36 no.2
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    • pp.54-59
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    • 2004
  • The methods for the minimization of fresh water consumption, waste water generation and water contamination have been greatly investigated and developed for last ten years. Recently, the rising cost of waste water treatment and the more strict environmental regulation lead to the higher demand of more efficient and systematic methods for process water management. The water reuse technology, which not only reduce the process water needs but also minimize waste water generation within the process, could be one of most efficient way for current demand. In this study, the practical way for reduction of water pollution and optimal reuse or recycle of process water in a newsprint mill was investigated by using a simulation model. The result of computer simulation showed that the COD level of approach system could be reduced by 50% after the stock concentration at the 2nd disc filter was increased upto 30%. The application of WRDF(Wrinkled Rotary Drum Filter) to the newsprint mill was carried out with pilot scale. The process water treated by WRDF had enough cleanliness to substitute the forming fabric shower water with the PDF water, which could result in the 30% reduction in fresh water consumption.

Study of MF membrane as pretreatment option using various backwash process from wastewater reuse pilot plant (전처리 MF의 다양한 역세 공정을 적용한 하수재이용 파일럿 플랜트 연구)

  • Park, Kwang-Duck;Park, Chansoo;Lee, Chang-Kyu;Kim, Jong-Oh;Choi, June-Seok
    • Journal of Korean Society of Water and Wastewater
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    • v.30 no.3
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    • pp.335-341
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    • 2016
  • Various studies have forwarded an outstanding wastewater effluent treatment systems toward securing sustainable supply of water sources. In this paper, a broad overview of the performance of MF membrane as pretreatment option for wastewater reuse will be presented based on the literature survey and experiments conducted over the wastewater reuse pilot plant. The pilot plant was operated with a continuous data acquisition for about 300days under various chemical enhanced backwash (CEB) system with subsequent treated water quality analysis. Accordingly, assessment of the effluent revealed that the pretreated water is suitable enough to be used as an input for Reverse Osmosis (RO) unit and significant effect of CEB and concentration of NaOCl is also conceived from the analysis. Moreover, it's also observed that the application of various CEB condition over long operational hours induced a constant declination of overall performance of MF membrane.

A Study for the Effective Classification and Retrieval of Software Component (효과적인 소프트웨어 컴포넌트 분류 및 검색에 관한 연구)

  • Cho, Byung-Ho
    • Journal of Internet Computing and Services
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    • v.7 no.6
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    • pp.1-10
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    • 2006
  • A software development using components reuse is an useful method to reduce the software development cost. But a retrieval method by the keyword and category classifications is difficult to search an exact matching component due to components complexity in component reuse. Therefore, after different existing methods are examined and analyzed, an effective classification and retrieval method using XML specifications and the system architecture of components integrated management based on it are presented. Many discording elements of DTD which is component meta-expression exist in components retrieval. To compensate it, this retrieval method using estimations of precision and concision is effective one to catch considerable matching preference components. This method makes possible to retrieve suitable components having better priority due to searching similar matching components that are difficult in an existing keyword matching method.

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A Study on the Pretreatment Process for Sewage Reuse by Microfiltration Process (정밀여과에 의한 하수고도처리수의 재이용을 위한 전처리법에 관한 연구)

  • Kuk, Young-Long;Joo, Jae-Young;Bae, Yoon-Sun;Lee, Hye-In;Jung, In-Ho;Park, Chul-Hwi
    • Journal of Korean Society of Water and Wastewater
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    • v.24 no.5
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    • pp.595-601
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    • 2010
  • It is evident that Korea will continue its battle with water shortage and alternative program are being taken into action. One of the main actions is reusing 1,800 tons of effluent of 357 sewage treatment plant located nationwide. Therefore this study supplemented ozone oxidation methods that would increase the efficiency of organic oxidation and coagulation. Through this method, fouling will be controled sufficiently by preventing membrane process in the system for advanced sewage treatment. In this study, ozone-coagulation-microfiltration membrane were used. The final removal efficiency of the pretreated water from the result of the ozone-coagulation were 50% of CODcr, 38% of TP and 11% of TOC respectively. Water quality treatment has decreased about 80% for TP. Ozone-coagulation-microfiltration membrane maintains the high flux while decreasing the number of organic matter and the membrane fouling, and reducing the TP. As a result, in order to reuse the water from the sewage, the ozone-coagulation-microfiltration membrane type must be considered in order to achieve the best efficiency.

The performance analysis for intercell interference reduction techniques in WiBro networks (와이브로 기반의 셀간 간섭 제거 기술 성능 분석)

  • Park Chi-Ho;Oh Young-Hwan
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.5 s.347
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    • pp.104-112
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    • 2006
  • In this thesis, we analyze performance related to reduction scheme of intercell interference causing serious problems in wiBro system. Frequency reusing factor(FUF) is 1 in WiBro system, and it means that a adjacent cell uses same frequency band. This channel environment raises intercell interference problem, which provokes serious problems related to system performance and channel capacity. Consequently, it affects deterioration in system performance as a whole. We analyze intercell interference when appling a various schemes such as (DCA)Dynamic Channel Allocation, CS(Channel Segregation), IMUFR(Interference Mitigation Using Frequency Reuse), IDMA(Interleave Division Multiple Access), IDMA(Interleave Division Multiple Access), FH-OFDM, CRSA(Conceptual Random Subcarrier Allocation), and HDD

Feasibility Study of UV-Disinfection for Water Reuse of Effluent from Wastewater Treatment Plant (용수재이용을 위한 하수처리 유출수의 UV 소독 효율 연구)

  • 윤춘경;정광욱;함종화;전지홍
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.45 no.2
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    • pp.126-137
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    • 2003
  • The feasibility study of UV-disinfection system was performed for disinfection of effluent from wastewater treatment plant. Three low-pressure UV lamps of 17, 25, and 41 W were examined with various flow rates. Low-pressure UV lamps of 17W were examined with various turbidity, DOM (dissolved organic matter), and SS (suspended solid). The pilot plant was a flow-through type UV-disinfection system, and the range of exposure time varied from 5 to 40 seconds, turbidity from 0 to 40 NTU, DOM from 0 to 30 mg/L, and SS from 10 to 40 mg/L. The 41W lamp demonstrated complete disinfection showing no survival ratio in all the experimental conditions, and generally 17W and 25W lamps also showed high removal ratio over 97%. For the same UV dose (UV intensity times exposure time), high intensity-short exposure conditions showed better disinfection efficiency than low intensity-long exposure conditions. While the effects of turbidity and DOM were not apparent, the effects of SS was significant on the disinfection efficiency which indicates that SS control before UV-disinfection appears to be necessary to increase removal efficiency. Considering characteristics of effluent from existing wastewater treatment plants, cost-effectiveness, stable performance, and minimum maintenance, the flow-through type UV-disinfection system with high intensity and low-pressure lamps was thought to be a competitive disinfection system for wastewater reclamation.