• 한국환경과학회지
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• 제23권6호
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• pp.1061-1066
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• 2014

This study has cross checked the change of internal sludge-recycle in Anaerobic-Digestion, and researched about not only the improvement of Bio-gas production from the digested sludge but also the efficient method of sludge minimization. Ultimate object of the study is to reduce the amount of sludge by the improved efficiency of contact with the organic-matter and the microbes in Anaerobic-Digestion. The sludge-recycle fluidized sludge layer and raised the activity of the sludge, the optimal sludge-recycle ratio, VS and COD removal ratio were 1,000%, 28.2% and 27.7%, respectively. Through these results of this study, it may be of use to treat waste sludge by the sludge-recycle ratio in terms of minimization and circulation of resources.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• 제10권S_1호
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• pp.35-40
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• 2001

Effect of the addition of an enzyme/microbial additive(EMA) to enhance anaerobic digestion of the primary sludge was investigated. Two laboratory scale anaerobic digester were operated with primary sludge taken from a municipal wastewater treatment plant. The digester receiving EMA with the sludge feed performed better than the control digester, when both were operated at 10-days and 15-days Solid Retention Time(SRT). Addition of EMA to the experimental digester provided 7%(10-days SRT) and 16%(15-days SRT) higher gas production compared to the control digester when both were fed with the same amount of volatile solids. The reduction in volatile solids was 24% better in the experimental digester compared to the control ar 10-days SRT, and the improvement 10% at 15-day SRT. Improvement in COD reduction, and fecal coliform density reduction were also seen in the experimental digester due to EMA addition compared to the control both ar 10-days SRT and 15-day SRT operation. Preliminary cost benefit analysis for a wastewater treatment plant showed that approximately $115/day in gas production improvements can be realized upon addition of EMA to primary sludge anaerobic digesters operating at 10-day SRT. The value of increased gas production was $172/day if the same digesters are operated with EMA addition at 15-day SRT.

• 한국환경과학회지
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• 제28권2호
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• pp.203-209
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• 2019

Organic wastewater generated from polyester manufacturing processes was selected from H company to investigate the feasibility of anaerobic digestion that produces gases including methane. Bio Methane Potential (BMP) tests were conducted to measure the gas production and methane concentration for 7 process wastewater and 2 kinds of sludges from the H company. Also, along with monitoring pH and alkalinity during the anaerobic digestion process, the concentrations of COD and 1,4-dioxane were measured with 4 different operating conditions for N Emulsion (NE) and Ethylene Glycol (EG) wastewater. The BMP tests showed that 65% of methane was produced from NE and EG wastewater. This suggests that the organic wastewater from H company can be effectively treated by an anaerobic digester by which more than 90% of COD was removed.

• 유기물자원화
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• 제21권4호
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• pp.50-61
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• 2013

교내 식당에서 분리 수거된 음식물류 폐기물에서 재생 에너지인 메탄가스를 생산하기 위해 혐기성 소화시스템에 대한 연구가 수행되었다. 1차 실험에서 침출수 인발/반송도 없고 혼합도 없는, 침출수 인발/반송은 없고 혼합이 있는, 침출수 인발/반송은 있고 혼합이 없는, 그리고 침출수 인발/반송은 있고 혼합이 있는 4개의 혐기성 시스템에서 침출수 인발/반송은 있고 혼합이 없는 시스템에서 가스발생이 가장 많은 것으로 나타났다. 반응조 혼합이 없고 침출수 인발/반송이 수행되는 시스템에서는 침출수의 반응조 내 침출수 유출속도가 빠른 경우에 혐기성 반응이 활발히 일어난 것으로 관찰되었다. 가스수집기 무게가 1kg이고 음식물류 폐기물 C/N비가 10이상이 되는 경우 혐기성 반응조의 가스가 소모되어 가스수집기에 부압이 걸리는 것이 관찰되었는데, 이에 대한 원인을 밝히는 것이 음식물류 폐기물에서 재생에너지를 회수하는데 필수적이다.

• 웰빙융합연구
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• 제6권2호
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• pp.33-37
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• 2023

Purpose: Since 2013, marine dumping of wastewater has been banned, and research on eco-friendly and efficient land treatment has emerged. This study compared and tested changes in biogas production and anaerobic process efficiency depending on whether or not enzyme pretreatment was performed during anaerobic digestion from single-phase and two-phase to medium-temperature. Research design, data and methodology: The total sugar, direct sugar, pH, and acidity before and after fermentation were analyzed by G/C by anaerobic fermentation of the liquor wastewater, food wastewater 1, and food wastewater 2 at 30℃ for 67 hours, and the amount of methane gas generated was analyzed by balloon volume. Results: It was found that stable organic acid concentration and pH were found in the enzyme-treated food wastewater 2, and the amount of methane gas generated was also increased. Conclusions: When anaerobic digestion of the liquor wastewater and the food wastewater together, the performance of enzyme pretreatment resulted in increased digestive efficiency. It will be the basic data that can contribute to carbon neutrality and greenhouse gas reduction by increasing the production of biogas.

• 유기물자원화
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• 제27권3호
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• pp.5-13
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• 2019

본 연구는 돈분 슬러리 단독 및 돈분과 우분슬러리 혼합, 가축분뇨 슬러리와 과실착즙박(사과착즙박, 감귤착즙박) 혼합 혐기처리가 바이오가스 발생에 미치는 영향을 규명하기 위하여 가동하였다. 6개의 중온소화 반응조를 96일간 가동하였으며, 유기물 부하량은 $1.0kg-VS/m^3{\cdot}day$ 으로 하였다. 과실착즙박이 혼합된 처리구인 돈분 슬러리와 감귤착즙박 혼합 처리구(70 : 30)가 가장 높은 메탄 생산량을 나타내었다. 반면, 돈분슬러리 단독 처리구의 메탄 발생량은 가장 적었다. 돈분, 우분 슬러리와 감귤착즙박 혼합 처리구가 돈분 슬러리 단독 처리구보다 바이오가스와 메탄가스가 2배 이상 많이 발생되었다. 돈분 슬러리와 감귤착즙박 혼합 처리구가 메탄가스 발생량이 많았던 것은 과일착즙 후 발생하는 과일박이 낮은 pH를 나타내어 가축분뇨 내 높은 알칼리도와 적절히 중화될 수 있으며, VS가 돈분슬러리보다 높았기 때문인 것으로 사료된다. 결론적으로 가축분뇨와 과실착즙박 혼합 투입이 돈분 단독 소화 보다 메탄가스 생산을 높이는 장점이 있다.

• 상하수도학회지
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• 제25권4호
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• pp.611-616
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• 2011

The impacts of ultrasonic pretreatment on the biodegradability of domestic sewage sludge were evaluated through a series of anaerobic digestion experiments in batch system. The gas and methane production from the sludge samples pretreated by an ultrasonic tool with different durations were measured with time. Although the biogas production increased with the extent of sludge solubilization and the period of ultrasonic pretreatment, the enhancement of sludge biodegradability was much more sensitive to the pretreatment for the relatively short periods. Most of the enhanced biodegradability by the pretreatment was appeared in the early stage of anaerobic digestion, less than 6 days. The maximum biogas production per day was observed between 4 to 6 days when the sludge was pretreated less than 10 minutes while it was obtained in the beginning for the sludge pretreated longer periods. The results suggest that the repeated alternation of low strength ultrasonic pretreatment and anaerobic digestion may be more effective than the combination of one time pretreatment for a relatively long period and following anaerobic digestion.

• 대한환경공학회지
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• 제33권7호
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• pp.516-522
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• 2011

국내에서 운영중인 혐기성 소화조의 가장 큰 문제점은 낮은 소화효율이며, 이에 대한 원인은 낮은 유기물 투입농도, 소화조내의 낮은 교반 효율, 잉여슬러지의 난분해성 등이다. 본 연구에서는 혐기성 소화설비의 효율성을 높이기 위하여 기존의 혐기성 소화 시스템에 농축 및 교반, 오존 가용화 설비를 설치하고, 기존의 2단 소화조에서 단단소화조로 개선함으로서 소화효율 및 바이오가스의 발생량을 증대 시키고자 하였다. 이러한 개선을 통하여 농축시스템의 슬러지 농도는 2.6배 향상되었음을 확인하였으며, 농축효율은 3.0배 증가한 것으로 나타났다. 또한, 기계식 교반으로 사공간이 줄어들었음을 확인하였으며, 혐기성 소화조 내 소화가스 발생량도 평균 $193.8m^3$/일에서 평균 $386.0m^3$/일로 향상된 것을 확인하였다. 소화효율은 평균 47.6%에서 54.6%로 향상되어진 것으로 나타났으며, VS제거당 소화가스 발생량은 평균 $0.30Nm^3/kg$ VS removal에서 $0.42Nm^3/kg$ VS removal로 증대되어진 것으로 나타났다.

• 상하수도학회지
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• 제14권1호
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• pp.117-126
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• 2000

Solubilization pretreatments were conducted to enhance the anaerobic digestion of the waste activated sludge. Four pretreatment techniques including heating, sonication freezing and thawing, and enzyme addition were employed to solubilize the waste activated sludge under various conditions. Thermal pretreatment by heating showed the highest efficiency compared with other methods, and freezing and thawing was confirmed as a feasible alternative of solubilization as well as the pretreatment of dewatering. There is a clear correlation between the solubilization efficiency of the waste activated sludge and the gas production. Batch digestion results showed the cumulative gas production as much as four times after thermal pretreatment as compared with that by the control sludge without pretreatment. As a result, hydrolysis or solubilization pretreatment might play a significant role in the high rate digestion of the waste activated sludge.

• Asian-Australasian Journal of Animal Sciences
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• 제10권6호
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• pp.541-550
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• 1997

Anaerobic chytridiomycete fungi are now well recognized as one of the major components of rumen microflora. Since the discovery of anaerobic fungi, the knowledge upon their morphology and physiology has been accumulated. It is certain that they gave roles in ruminal fiber digestion, although their quantitative contribution to rumen digestion is still unclear. Their role in fiber digestion is complicated by the dietary factors and the interaction with other microorganisms. We aim at reviewing such information in this article. Considerable attention gas been paid to the polysaccharidase of these fungi. Analysis on the fungal genes encoding these enzymes has been performed in several laboratories. This article also covers the genetical analysis of fungal polysaccharidases.