• 신재생에너지
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• 제4권2호
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• pp.81-86
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• 2008

Rotary kiln in cement work has been evaluated for a wide variety of organic wastes such as wood, used tyres, plastic wastes and automobile shredder residue (ASR). However the presence of chlorine hampers the use of ASR as fuel in rotary kiln. Therefore, the behavior characteristics of chlorine components in rotary kiln should be considered to develop an effective method for ASR treatment to recovery energy resources. The aim of this paper is to present the chlorine control system applied to a cement manufacturing process for ASR use as an alternative fuel. In this work, the simulation of bypass unit and cyclones for chlorine control in rotary kiln has been studied and compared with the operation results of field test.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVII)
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• pp.250-255
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• 2005

높은 원가인 펩톤을 다른 질소원으로 대체하기 위하여 콩 혹은 효모의 질소원 대체가능성을 검토한 결과 효모의 농도를 0.5%의 펩톤과 동등한 양의 질소원으로 하였을 때 amylase의 생산성이 2.30 U/ml로써 가장 높았다. 때문에 높은 원가의 펩톤을 효모로 대체하는 것이 가능할 것으로 사료된다.

• 한국미생물·생명공학회지
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• 제5권1호
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• pp.1-4
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• 1977

폐섬유자원을 기질로 하여 단세포단백을 생산할 목적으로 225종의 균원시료에서 252주의 섬유소자화세균을 분리하였고 이들 중 섬유소 자화력인 가장 강한 균 1주를 동정한 결과 Cellulomonas flavigena와 일치하였다.

• 펄프종이기술
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• 제46권1호
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• pp.18-28
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• 2014

Renewable Portfolio Standards(RPS) is a regulation that requires a renewable energy generated from eco-friendly energy sources such as biomass, wind, solar, and geothermal. The RPS mechanism generally is an obligatory policy that places on electricity supply companies to produce a designated fraction of their electricity from renewable energies. The domestic companies to supply electricity largely rely on wood pellets in order to implement the RPS in spite of undesirable situation of lack of wood resources in Korea. This means that the electricity supply companies in Korea must explore new biomass as an alternative to wood. Palm kernel shell (PKS) and empty fruit bunch (EFB) as oil palm wastes can be used as raw materials used for making pellets after their thermochemical treatment like torrefaction. Torrefaction is a pretreatment process which serves to improve the properties including heating value and energy densification of these oil palm wastes through a mild pyrolysis at temperature typically ranging between 200 and $300^{\circ}C$ in the absence of oxygen under atmospheric pressure. Torrefaction of oil palms wastes at above $200^{\circ}C$ contributed to the increase of fixed carbon with the decrease of volatile matters, leading to the improvement of their calorific values over 20.9 MJ/kg (=5,000 kcal/kg) up to 25.1 MJ/kg (=6,000 kcal/kg). In particular, EFB sensitively responded to torrefaction because of its physical properties like fiber bundles, compared to PKS and hardwood chips. In conclusion, torrefaction treatment of PKS and EFB can greatly contribute to the implement of RPS of the electricity supply companies in Korea through the increased co-firing biomass with coal.

• 공업화학
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• 제24권4호
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• pp.428-432
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• 2013

충북의 산림지역에서는 목재의 가지치기에 의하여 다량의 폐목재가 발생되고 있으나, 이러한 폐목재들은 부산물로서 특정한 처리가 이루어지지 않고 있다. 본 실험에서는 폐목재(참나무, 향나무, 낙엽송, 소나무) 중에서 납 이온의 제거능력이 효과적인 생물흡착제로서 향나무를 도출하였다. 또한, 폐향나무를 사용하여 수중에 함유된 납의 제거 효율을 고찰하였다. 20 mg/L 납 이온의 제거 효율을 증가시키기 위한 최적의 초기 pH가 4임을 알 수 있었으며, 50 mg/L 납이온 제거를 향상을 위한 최적의 생물흡착제 주입농도가 0.6 g/100 mL임을 구하였다. 또한, 100 mg/L 이상의 고농도 납 이온의 흡착 능력을 향상시키기 위해서는 향나무의 황산 처리에 의한 화학적 개질 반응이 필요함을 알 수 있었다. 그리고 6 M 황산으로 개질된 향나무를 이용하여 200, 400, 500 mg/L의 납을 처리하였을 때, 납의 흡착량은 각각 180, 340, 425 mg/g를 나타내었다. 이러한 실험 결과들은 수중에 함유된 납 이온을 효과적으로 처리하는 실질적인 생물흡착제기술로 사용될 수 있을 것이다.

• Journal of the Korean Wood Science and Technology
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• 제29권3호
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• pp.47-58
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• 2001

For finding both ways of recycling the wood and plastic wastes and solving the problem of free formaldehyde gas emission through manufacturing wood particle-polypropylene fiber composite board without addition of formaldehyde-based thermosetting resin adhesive, control particleboards and nonwoven web composite boards from wood particle and polypropylene fiber formulation of 50 : 50, 60 : 40, and 70 : 30 were manufactured at density levels of 0.5, 0.6, 0.7, and 0.8 g/$cm^3$, and were tested both in the physical and mechanical properties according to ASTM D 1037-93. In the physical properties, control particleboard had significantly higher moisture content than composite board. In composite board, moisture content decreased with the increase of target density only in the board with higher content of polypropylene fiber and also appeared to increase with the increase of wood particle content at a given target density. Control particleboard showed significantly greater water absorption than composite board and its water absorption decreased with the increase of target density. In composite board, water absorption decreased with the increase of target density at a given formulation but increased with the increase of wood particle content at a given target density. After 2 and 24 hours immersion, control particleboard was significantly higher in thickness swelling than composite board and its thickness swelling increased with the increase of target density. In composite board, thickness swelling did not vary significantly with the target density at a given formulation but its thickness swelling increased as wood particle content increased at a given target density. Static bending MOR and MOE under dry and wet conditions increased with the increase of target density at a given formulation of wood particle and polypropylene fiber. Especially, the MOR and MOE under wet condition were considerably larger in composite board than in control particleboard. In general, composite board showed superior bending strength properties to control particleboard, And the composite board made from wood particle and polypropylene fiber formulation of 50 : 50 at target density of 0.8 g/$cm^3$ exhibited the greatest bending strength properties. Though problems in uniform mixing and strong binding of wood particle with polypropylene fiber are unavoidable due to their extremely different shape and polarity, wood particle-polypropylene fiber composite boards with higher performance, as a potential substitute for the commercial particleboards, could be made just by controlling processing variables.

• 한국가구학회지
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• 제13권2호
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• pp.1-10
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• 2002

A computer top table was manufactured with the solid wood wastes that has been landfilled, combustion or burnt as a fuel at the present time. The computer table is different in form and size to that of existing fixed rectangular. It is idea1 product not only convenient and functional to use and beautiful design but also processing Performance of edge area and overlaying properties. The main technologies to develop this computer top table are plan for moulder to mould the Product and producing, molding the most suitable material and composition, suitable adhesives selecting and synthetic technology, investigation for the moulding conditions such as temperature, time etc, adequate overlaying materials selecting and overlaying technology have to be chocked.

• 유기물자원화
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• 제16권1호
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• pp.70-78
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• 2008

본 연구에서는 경기도 B지역 학교 폐기물의 성상 및 물리 화학적 특성을 조사하였다. 이것은 폐기물 재활용 및 자원화시설 설계를 위한 기초자료로 활용할 수 있게 하고자 한다. 학교폐기물의 물리적 조성의 실험결과 음식 쓰레기 12.25%, 종이류 56.26%, 플라스틱과 비닐류 9.26%, 섬유 1.52%, 나무 3.70%, 고무 및 피혁류와 기타는 0.11%이다. 학교폐기물의 대부분은 종이류와 플라스틱류이고, 약 90%가 가연성분인 것으로 나타났다. 삼성분 분석 결과 수분 5.72%, 가연분 88.29%, 그리고 회분 5.98%로 나타났으며, 농촌지역 학교 폐기물 성분중 수분이 도시지역 학교보다 높게 나왔다. 건조된 폐기물의 원소 분석 결과 탄소, 산소, 수소가 높게 나왔으며 학교폐기물의 저위발열량은 3051.44kcal/kg로 조사되어졌다.

• 설비공학논문집
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• 제20권8호
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• pp.526-533
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• 2008

In this study, theoretical super screen vibration analysis has been carried out to predict the dynamic characteristics of interactive waste particles. In order to approach these problems, it is necessary to have a fundamental understanding the screening process and the process of both the remaining and the passed material on a screen with several interacting screen planes based on Soldinger(1999) was discussed. Here, the vibrating screen is composed of three assemblies such as screen, wastes guide, and supported screen as shown in Fig. 1. This model is regarded vibrator as the system of screen fixed tilt plates. Then materials(or particles) of different size is to be separated by using the eccentric vibrator and classifying tilt plates. As well moisturized construction wastes is more efficient to separate than moisture-less it. In processing separate mechanism, the more materials is light, the more staying time is long. Thus much lighter construction wastes(wood, Styrofoam, etc) and heavier materials are separated by staying time delay in a super screen. The design results, separation screen were able to know that small and larger particles are conspicuous difference each motion character according to trajectory particles, and small particles raise the probability in classifying tilt plates.

• Journal of the Korean Wood Science and Technology
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• 제27권2호
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• pp.62-69
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• 1999

본 연구는 표고버섯 재배폐골목 및 지조를 이용한 유기질비료 제조를 위한 적정 조건을 찾고, 제조한 유기질비료를 사용하여 식물의 생육 및 토양온도에 미치는 영향을 검토하기 위하여 실시하였다. 시멘트블록조 발효상을 사용하여 제조한 톱밥과 발효첨가제를 적량 첨가하여 퇴적후, 1 개월마다 뒤집기하면서 발효부숙시켜 표고버섯 재배폐골목 및 신선지조로부터 양질의 유기질비료를 제조할 수 있었다. 적정 제조조건으로서는 목질계 재료 1톤에 대하여 요소비료 12kg, 석회 25kg, 계분 40kg 및 적당량의 발효첨가제가 필요하였으며, 함수율은 55% 였다. 유식물 파종실험에서 유기질비료의 혼합량이 많아질수록 무우의 생장이 우수한 것으로 나타났으며, 유기질비료의 혼합율이 증가함에 따라 토양의 온도가 다소 높아지는 경향을 나타냈다. 유기질비료는 아침 외기의 온도가 내려가면, 토양의 온도를 높게 유지시키며, 외기의 온도가 높은 시간대는 오히려 토양의 온도를 낮추는 온도완충효과를 주었는데, 이러한 효과는 유기질비료의 혼합비가 높아질수록 더욱 커지는 것으로 나타났다.