• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.172-172
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• 2011

Anaerobic digestion(AD) has successfully been used for many applications that have conclusively demonstrated its ability to recycle biogenic wastes. AD has been successfully applied in industrial waste water treatment, stabilsation of sewage sludge, landfill management and recycling of biowaste and agricultural wastes as manure, energy crops. During AD, i.e. organic materials are decomposed by anaerobic forming bacteria and fina1ly converted to excellent fertilizer and biogas which is primarily composed of methane(CH4) and carbon dioxide(CO2) with smaller amounts of hydrogen sulfide(H2S) and ammonia(NH3), trace gases such as hydrogen(H2), nitrogen(N2), carbon monoxide(CO), oxygen(O2) and contain dust particles and siloxanes. The production and utilisation of biogas has several environmental advantages such as i)a renewable energy source, ii)reduction the release of methane to the atomsphere, iii)use as a substitute for fossil fuels. In utilisation of biogas, most of biogas produced from small scale plant e.g. farm-scale AD plant are used to provide as energy source for cooking and lighting, in most of the industrialised countries for energy recovery, environmental and safety reasons are used in combined heat and power(CHP) engines or as a supplement to natural. In particular, biogas to use as vehicle fuel or for grid injection there different biogas treatment steps are necessary, it is important to have a high energy content in biogas with biogas purification and upgrading. The energy content of biogas is in direct proportion to the methane content and by removing trace gases and carbon dioxide in the purification and upgrading process the energy content of biogas in increased. The process of purification and upgrading biogas generates new possibilities for its use since it can then replace natural gas, which is used extensively in many countries, However, those technologies add to the costs of biogas production. It is important to have an optimized purification and upgrading process in terms of low energy consumption and high efficiency giving high methane content in the upgraded gas. A number of technologies for purification and upgrading of biogas have been developed to use as a vehicle fuel or grid injection during the passed twenty years, and several technologies exist today and they are continually being improved. The biomethane which is produced from the purification and the upgrading process of biogas has gained increased attention due to rising oil and natural gas prices and increasing targets for renewable fuel quotes in many countries. New plants are continually being built and the number of biomethane plants was around 100 in 2009.

• 상하수도학회지
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• 제21권6호
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• pp.727-735
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• 2007

The use of water by cities is increasing owing to industrialization, the concentration of population, and the enhancement of the standard of living. Accordingly, the amount of waste water is also increasing, and the degree of pollution of the water system is rising. In order to solve this problem, it is necessary to remove organisms and suspended particles as well as the products of eutrophication such as nitrates and phosphates. This study developed a high-end treatment engineering solution with maximum efficiency and lower costs by researching and developing a advanced treatment engineering solution with the use of Biosorption. As a result, the study conducted a test with a $50m^3/day$ Pilot Scale Plant by developing treatment engineering so that only the secondary treatment satisfies the standard of water quality and which provided optimal treatment efficiency along with convenient maintenance and management. The removal of organisms, which has to be pursued first for realizing nitrification during the test period, was made in such a way that there would be no oxidation by microorganisms in the reactor while preparing oxygen as an inhibitor for the growth of microorganism in the course of moving toward the primary settling pond. The study introduced microorganisms in the endogeneous respiration stage to perform adhesion, absorption, and filtering by bringing them into contact with the inflowing water with the use of a sludge returning from the secondary settling pond. Also a test was conducted to determine how effective the microorganisms are as an inner source of carbon. The HRT(Hydraulic Retention Time) in the nitrification tank (aerobic tank) could be reduced to two hours or below, and the stable treatment efficiency of the process using the organisms absorbed in the NAR reactor as a source of carbon could be proven. Also, given that the anaerobic condition of the pre-treatment tank becomes basic in the area of phosphate discharge, it was found that there was excellent efficiency for the removal of phosphate when the pre-treatment tank induced the discharge of phosphate and the polishing reactor induced the uptake of phosphate. The removal efficiency was shown to be about 94.4% for $BOD_5$. 90.7% for $COD_{Cr}$ 84.3% for $COD_{Mn}$, 96.0% for SS, 77.3% for TN, and 96.0% for TP.

• 자원리싸이클링
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• 제22권3호
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• pp.73-80
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• 2013

산업적 요구에 따른 금속 소재의 사용량은 급증하고 있으나, 한정된 유용가능 자원으로 인해 원소재 가격이 급속도로 상승하고 있어, 이들 금속 자원의 안정적 확보가 국가 경쟁력 확보 및 지속적인 경제 성장의 핵심 요소로 인식되고 있다. 전량 수입에 의존하고 있는 마그네슘 소재의 경우, 수명을 다한 자동차 및 3C(Camera, Computer, Communication) 제품의 폐부품과 마그네슘의 용해 과정에서 발생하는 슬러지 및 드로스 등의 저품위 스크랩은 전량 폐기되고 있어 자원순환의 효율성을 제고하고 독자적인 원소재 수급 체계를 확립하기 위해서는 저품위 스크랩의 재활용 기술 개발 및 상용화가 절실하다. 본 연구에서는 폐마그네슘의 재활용 기술에 대한 특허와 논문을 분석하였다. 분석범위는 1974년~2012년까지의 미국, 유럽연합, 일본, 한국의 등록/공개된 특허와 SCI 논문으로 제한하였다. 특허와 논문은 키워드를 사용하여 수집하였고, 기술의 정의에 의해 필터링 하였다. 특허와 논문의 동향은 연도, 국가, 기업, 기술에 따라 분석하여 나타내보았다.

• 한국지반환경공학회 논문집
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• 제16권12호
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• pp.45-52
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• 2015

최근 산림 훼손지를 원래 상태로 되돌리기 위한 생태복원에 대한 관심이 높아지면서 인공 비탈면을 보강하면서 친환경적인 녹화가 될 수 있는 연구가 진행되고 있으며, 이러한 생태복원을 목표로 식생생육의 기반이 되는 인공토양의 조성과 관련된 많은 기술들이 개발되고 있는 추세이다. 본 연구에서는 하수오니, 톱밥, 제지슬러지, 화강풍화토가 포함되어 사용되고 있는 녹생토와 친환경적인 토양안정재를 활용하여 연구수행을 하였다. 토양안정재와 혼합된 녹생토를 이용해 기본물성실험을 통해 녹생토의 기본적인 특성을 분석하였으며, 친환경적인 토양안정재를 일정비율로 녹생토와 혼합하여 각각의 비율에 따른 전단강도실험을 수행하여 최대전단강도를 분석하고 이에 따른 점착력과 내부마찰각을 산정하였다. 그리고 녹생토와 토양안정재의 혼합비율을 전단강도실험과 동일한 조건으로 비탈면의 기울기를 적용하여 토양안정재의 혼합비율에 대한 침식률과 발아율을 분석하여 주변 환경적 요인에 대처 가능한 토양안정재의 경제적인 혼합비율을 고찰하고자 한다. 실험결과 양생기간과 안정재의 혼합률에 따라 최대 51%까지 전단강도가 증가하였으며, 실험결과를 바탕으로 내부마찰각과 점착력이 모두 상승한 점을 확인하여 안정재가 녹생토의 전단성능 과침식저항 향상에 기여하고 있음을 확인하였다.