• Journal of the Korea Organic Resources Recycling Association
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• v.16 no.2
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• pp.29-37
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• 2008

In this work, it was investigated that various aspects of process, application situation, merits and short-coming results of the thermophilic methane fermentation with highly concentrated organic waste substances such as sewage sludges, food wastes and excretions. The merits of this methane fermentation were that it had a very fast reaction rate and was possible to proceed in high loads. It was also high in mortality for pathogenic microorganism and the digested sludge was more hygienic. However, the short-comings were that more energy was required for heating in the fermentation facility, no surplus energy could be gained from low concentration of organic waste, the fermentation treatment dropped level of water quality, thus burdens discharging process of water. Especially, the high concentration of methane fermentation could possibly lack nutritious salt and could face the disturbance by ${NH_4}^+-N$, a proper alternative was required. In general, thermophilic methane fermentation was considered as a better mean in disposing of cow excretion and food waste which were highly concentrated organic wastes. On the other hand, under the condition where the concentration of waste material was low and the high concentrate waste material became higher than 3,000 mg/L in ${NH_4}^+-N$, thermophilic methane fermentation resulted less desirable outcome.

• Applied Chemistry for Engineering
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• v.23 no.2
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• pp.228-231
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• 2012

In this work, the mixture of sewage sludge incubated in an anaerobic bioreactor for 35 days and paperboard sludge was treated in a batch anaerobic digester equipped with a ultrasonicator, and methane production during the treatment was investigated. The Soluble Chemical Oxygen Demand (SCOD) increased with increasing the amplitude of ultrasonicator, which help solubilizing paperboard sludge more effectively. The optimum amplitude of ultrasonicator for the enhancing methane productivity was found to be $142.5\;{\mu}m$ and the methane production amount increased as the anaerobic digestion period became longer. In addition, the anaerobic digestion was performed with various biomass (6000, 9000 and 12000 mg/L) and methane production increased with higher cell mass. These results will be used as valuable data to enhance the methane production from anaerobic digestion of the high concentration of organic wastes containing the paperboard sludge and sewage sludge.

• Journal of the Korea Organic Resources Recycling Association
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• v.26 no.4
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• pp.5-10
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• 2018

In this study, the effect of physico-chemical factors (e.g., pressure, electrolyte, and organic matter) in the gas hydrate deposit on CH4-CO2 replacement process was investigated experimentally. The higher initial pressure during gas injection led the higher reaction rate at the first time, but finally it did not. Electrolytes and organic matter have some effects on reforming process after dissociation of gas hydrate. It is expected that further research using real marine sediments with actual gas hydrate will enable the development of technologies applicable to the characteristics of domestic seabed geology. Ultimately, it is expected that it will be possible to recover and utilize methane as an organic resource through application of domestic gas hydrate deposit in the Ulleung Basin, East Sea.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.173-173
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• 2022

유기 퇴적 오염물은 다양한 형태로 호소 바닥에 축적되어 호소 환경 및 생태계에 악영향을 미치고 있으며 메탄가스와 같은 온실가스의 발생을 유발한다. 또한, 수력 산업, 관개, 이·치수 등 다양한 목적에 의해 수체의 형성이 활발하게 이루어지면서 하천 및 호소에 의한 탄소유출을 전지구적 탄소순환에 적극적으로 포함시켜야 한다는 필요성이 증가하고 있다. 따라서 하천 및 호소에서 발생하는 다양한 생지화학적 반응에 의한 메탄 발생 메커니즘 파악은 유역의 중요한 환경평가 지표를 나타내며 탄소 순환을 이해하는데 매우 중요하다. 수온, 수심, 유기물 조건에 따른 하천 및 호소의 메탄 발생을 분석한 연구들이 선행되었으나 생지화학적 특성을 정리하고 이에 따른메탄 발생을 정량화한 연구들은 거의 없는 상황이다. 본 연구는 호소 내 메탄을 발생시키는 기작을 판별하기 위해 수온과 호소 환경과 유사한 TOC(총유기탄소)와 TP(총인) 조건과 같은 유기물 조건을 설정하여 BMP Test를 수행하였다. 반응수조에서 발생한 가스를 포집한 후 GC(Gas Chromatograpghy) 분석을 통해 메탄 생성량을 산출하였고, 유기물 조건에 따라 이론적인 메탄 생성량 대비 실제 발생한 메탄 생성량을 나타내는 생분해도를 산출하여 호소 환경별 주요 기작에 따른 가스 발생을 정량화 하였다. 실험 결과 수온에 가장 큰 영향을 받았으며, 수온에 따라 TP, TOC 순으로 메탄 발생의 영향성을 확인하였다. 향후에는 호소 환경에서의 유기물 조건을 반영하기 위해 입도비, 점착성/ 비점착성 조건, 수체의 높이 조건을 포함한 추가 실험을 수행하고 메탄수율을 정량화하여 호소 내 유기퇴적물에 대한 생지화학적 및 수환경 영향 평가 기법 개발이 가능할 것으로 기대한다.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.763-766
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• 2007

국내에서 발생되는 고형폐기물 중 자원으로 재활용 가능한 유기성폐기물은 하수슬러지, 음식물류폐기물, 축산분뇨 등을 대표 할 수 있다. 이들 유기성폐기물은 환경적인 측면에서 볼 때 다른 유기성 폐수 및 폐기물에 비하여 오염부하량이 상대적으로 높지만, 이를 생물자원 (Biomass)으로 인식하고 이용 할 경우 지구온난화와 같은 환경문제 뿐만아니라 향후 자원고갈문제를 동시에 해결할 수 있는 대체에너지 자원이다. 유기성폐기물을 대체에너지 자원으로 효율적으로 이용하기 위해서는 우선적으로 국제적 환경규제와 에너지 정책에 능동적으로 대응할 수 있는 자원순환형 폐기물관리 시스템 구축이 필요하며, 이를 위한 체계적인 정책적 지원책과 기술 개발이 뒷받침 되어야 할 것이다. 자원 재활용과 에너지회수 기술에 있어 혐기성소화(anaerobic digestion)는 유기성폐기물의 효과적인 감량화, 재이용화, 안정화를 만족시키는 동시에 유용 에너지원인 메탄가스를 회수할 수 있는 바이오가스 전환기술로 최근에 주목을 받는 biotechnology 중의 하나로 자리매김 하고 있다. 특히, 소비자원의 대부분이 해외에 의존하는 국내현실과 최근 고유가에 따른 국가 에너지 정책을 제고해야하는 현 시점에서 유기성폐기물을 이용한 바이오가스화 기술을 널리 보급하기 위해서는 요소기술 개발과 정부의 적극적인 정책적 지원 방안이 마련되어야 할 것이다.

• Journal of the Korea Organic Resources Recycling Association
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• v.19 no.3
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• pp.29-34
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• 2011

In the present work, the anaerobic filter was used to treat the high concentration of organic wastewater which was produced in the beer production process. During the whole operation periods, wastewater treatment with methane production was effectively performed. The average removal efficiencies of BOD, CODcr, SS, TN and TP were 61.4, 60.9, 31.4, 70.7 and 70.0 %, respectively. Also, methane content in the total gas and methane production amount were 68.8 % and $0.08{\sim}0.77m^3CH_4/kgCOD$, respectively. As a consequence, the practical anaerobic digestion technology developed in this study showed a feasibility of an effective method to treat brewery wastewater with enhancing the methane productivity.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.383-384
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• 1999

도시대기 중의 광화학 대기오염의 원인인 동시에 사람의 건강상에 유해한 성분(발암성 혹은 돌연변이성)들이 많이 존재하는 것으로 알려진 대기오염물질 중에서도 탄화수소성분에 대한 관심이 최근들어 고조되고 있다. 메탄을 제외한 탄화수소성분을 총칭하여 비메탄계 탄화수소(NMHC)라고 일컫고 있으며, 비메탄계 탄화수소는 알데히드등의 산소화합물을 함유하고 있지 않지만, 휘발성 유기화합물(Volatile Organic Compounds;이하 VOCs)은 산소함유화합물을 포함한 물질을 말한다.(중략)

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.3
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• pp.356-362
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• 2010

This research studied the bio-methane potential of several waste biomass materials as alternative sources for biogas production, and the laboratory procedure for measuring the biochemical methane potential was described. The wastes from four agro-industries (sewage, livestock, food wastewater treatment sludge and cattle rumen substance generating in slaughter house) were evaluated as substrates for the assay of biochemical methane potential. In order to estimate the ultimate methane yield, two empirical equations (modified Gompertz equation and exponential equation) was investigated. The ultimate methane yield of sewage, livestock, food sludge and lumen substance estimated by the modified Gompertz equation were 0.086, 0.147, 0.146, and 0.121 L $CH_{4}\;g^{-1}\;VS_{added}$, respectively. The ultimate methane yield estimated by the exponential equation were 0.109, 0.246 and 0.174 L $CH_{4}\;g^{-1}\;VS_{added}$ in sewage, livestock sludge and lumen substance. And the ultimate methane yield estimated by the exponential equation showed more high values in the range of 26.7 ~67.3% than the ultimate methane yield estimated by the modified Gompertz equation.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.9
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• pp.869-877
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• 2008

• Journal of Korean Society of Environmental Engineers
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• v.30 no.9
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• pp.933-938
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• 2008

In the present study, carbon dioxide was converted to methane, using bio-hydrogen. Here, the bio-hydrogen was produced from organic waste. The anaerobic microorganism was cultured using only carbon dioxide and hydrogen for duration of 3 months. Therefore methane was not produced with acetogenotrophs. During methane production, carbon dioxide and hydrogen are taken in different ratios; among which 1 : 5 ratio has shown the highest methane yield. Carbon dioxide and hydrogen were introduced into the reactor at the rate of 8 mL/min and 40 mL/min, respectively. In this case, 92% of carbon dioxide was reduced and 2.2 m$^3$/m$^3$ day amount of methane was produced. Thus, the process has been successful in conversion of carbon dioxide into methane by purging it into methane fermentation reactor with bio-hydrogen using batch process.