• 제목/요약/키워드: Anaerobic digestion gas

검색결과 151건 처리시간 0.036초

고농도 암모니아성 질소 폐수의 효과적인 혐기성 처리를 위한 영향 인자 평가 (Estimation of influening factors for efficient anaerobic digestion of high strength ammonia-nitrogen wastewater)

  • 박세용;박정훈;나효성;김문일
    • 상하수도학회지
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    • 제26권5호
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    • pp.649-658
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    • 2012
  • In this study, the influencing factors for efficient anaerobic digestion of high strength ammonia-nitrogen wastewater removal were investigated by testing biochemical methane potential test. In the influencing factors, the trace metals which could increase activity of anaerobic microorganisms, microbial concentration and types were evaluated. In the results, trace metals supplementation showed gas production amount higher than those without addition of trace metals. Among the tested trace metals, B, Ni, and Se were preferable to gas production. In the result of gas production according to the microbial concentration, the amount of gas production was proportional to the microbial concentration. In addition, the shortest lag time and the fastest gas production rate were achieved when the highest microbial concentration was tested. granule-type microorganism produced more gas than suspended-type microorganism. In conclusion, the efficient anaerobic digestion for high strength ammonia-nitrogen wastewater removal could be achieved by applying necessary trace metals injection and high concentration granule type microorganism.

단상 혐기성 소화공정에서의 동력학적 연구 (A Study on Kinetics in One-Phase Anaerobic Digestion)

  • 조관형;조영태
    • 한국환경과학회지
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    • 제9권1호
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    • pp.75-80
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    • 2000
  • Kinetic data for the acid phase anaerobic digestion were presented in this study and the constants were determined with acid production rate and gas production rate. Process models based on continuous culture theory were used to describe the characteristics of the acid forming microorganisms and to enable further development toward utilization of the process in a more rational manner. Acid phase digestion can be separated with appropriate manipulation of hydraulic retention time in anaerobic digestion. Kinetic analysis of data from the various hydraulic retention times using a phase specific model obtained form the acid phase indicated maximum specific growth rate of 0.40/h, saturation constant of 2,000mgCOD.$\ell$, yield coefficient of 0.35 mgVSS/msCOD utilized and decay constant of 0.04/h for the acid production rate. Similar analysis of data for the gas production rate indicated maximum specific growth rate of 0.003/h, saturation constant of 2,200mgCOD/$\ell$, yield coefficient of 0.035 mgVSS/mgCOD utilized and decay constant of 0.06/h.

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혐기성 소화조의 에너지 효율 향상을 위한 수직 왕복형 교반기 적용에 관한 연구 (A Study on the Effect of Energy Saving with Newly Implemented Vertical Circulating Tray Mixer in Anaerobic digester)

  • 주윤식;손건태;배영준;박정수;이승환
    • 상하수도학회지
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    • 제31권1호
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    • pp.13-19
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    • 2017
  • Relatively low efficiency in anaerobic digestion process is mainly caused by unproper mixing method. In this study, tray motion type agitator was applied in actual anaerobic digestion tank in order to improve the digestion efficiency, equalize the flow velocity distribution and energy saving. The impeller of tray motion type agitator was reciprocated vertically. Gas lift type agitator and tray motion type agitator appears almost same mixing efficiency include digestion rates. However, tray motion type agitator have shown that lower energy consumption compared to the conventional gas lift type agitator. Implementation of tray motion type agitator in the anaerobic digestion tanks contributed to the stabilization of mixing environment, efficiency and energy efficiency of the tank.

好氣性 및 嫌氣性 消化에 의한 豚糞處理 (Aerobic and Anaerobic Digestion of Swine Manure)

  • Kim, Nam Cheon;Min,, Dal Ki
    • 한국환경보건학회지
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    • 제14권2호
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    • pp.43-49
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    • 1988
  • This study was conducted to evaluate the organic removal efficiencies and sludge production in aerobic and anaerobic digestion of swine manure. A laboratory single-stage, high-rate, anaerobic digester was operated at 5, 10, 25 and 30 day's HRT at the temperature of 35$\circ$C, and also aerobic digester operated at 10, 20 and 28.6 day's HRT at the temperature of 20$\circ$C. The conclusions from this study are as follows: 1. While the BOD removal efficiency by anaerobic digestion was 30 to 75%, it was 99% over by aerobic digestion. 2. The sludge production was similar in both aerobic and anaerobic digestion. 3. The gas production was 0.21 to 0.55 m$^3$/kg VS fed by anaerobic digestion.

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돈분 슬러리를 이용한 단상 혐기소화공정의 특성연구 및 성능평가 (Performance Evaluation and Characteristic Study of the Single Anaerobic Digestion from Piggery Slurry)

  • 박우균;전항배;박노백;권순익;신중두;홍승길
    • 한국환경농학회지
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    • 제30권1호
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    • pp.31-36
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    • 2011
  • 축산농가에서 발생되는 돈분 슬러리의 처리 능력을 평가하기 위하여 Full-scale의 단상 혐기성 소화조에서 중온소화와 고형물 체류시간을 20일로 하여 연속식으로 운전하면서 성능평가 및 특성연구를 실시하였다. 운전기간 중 알칼리도는 약 4,000 mg/L(3,500~9,000 mg/L as $CaCO_3$)이였고, 소화조내의 pH는 7.5~8.0 범위로 약간 높은 경향이었으나 pH는 안정적이었다. 바이오가스의 발생량은 OLR 1.2 $g{\cdot}COD/L{\cdot}day$에서 0.69 L/L/day의 바이오가스를 생산하였고, 제거된 COD를 바탕으로 계산된 메탄가스 발생량은 63% 수준이였다. 생산된 바이오가스 중 메탄가스 함량은 65~70%이었고, CO2는 약 30% 전후였으며, 열병합 발전을 실시하였을 때 총전력요구량의 50~75% 수준을 공급하였다. 또한 발전기 부하가 5~9 kW시 평균 1 kWh의 전력을 생산하기 위한 바이오가스 소모량은 약 1.8 $m^3$이였다. 따라서 실제 규모의 plant에서 약 500일간 운전한 결과 유입되는 돈분 슬러리의 TS 농도에 상관없이 소화조 내에 일정 농도의 유기물을 확보할 수 있었고, 바이오가스의 발생량은 일반적인 축산분뇨 가스 발생량 보다 높게 나타나 단상 혐기성 소화공정으로 고효율 처리가 가능한 것으로 나타났다.

국내 가축분뇨 혐기소화시설 현황 및 운영실태 분석 (Status of Anaerobic Digestion Facility for Pig-slurry in Korea)

  • 정광화;김중곤;한덕우;곽정훈
    • 한국축산시설환경학회지
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    • 제20권1호
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    • pp.27-34
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    • 2014
  • This study was conducted to survey and inspect the currently operating anaerobic digestion facilities for animal manure. Recently, the number of anaerobic digestion facility for livestock manure is on the rise thanks to growing interest in developing alternative energy. A anaerobic digestion system has been constructed in large scale farms or animal manure public resource center. Currently, most animal manure anaerobic digestion facilities in operation are producing biogas from the pig slurry which contains 97% water. Methane gas can be used to operate a engine generator which then produces electricity. Anaerobic digestate, a by-product of digestion, is mostly utilized as a liquid fertilizer after curing processing. Only in a few cases, it can be discharged after wastewater treatment process. The problem of anaerobic digestate treatment is the imbalance of C/N ratio. The content of N was too high to keep it into normal process.

염기성 소화에 대한 활성탄의 영향 (Effects of Powdered Activated Carbon on Anaerobic Digestion)

  • 김승현
    • 한국농공학회지
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    • 제32권3호
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    • pp.102-115
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    • 1990
  • Importance of anaerobic digestion as an energy generating device has been increased as fuel shortage becomes serieous. Several modification methods on the conventional digesters including Powdered Activated Carbon (PAC) addition and two-phase digestion were studied to enhance the gas production. This study investigated the effects of PAC on anaerobic digestion of chicken manure in terms of gas production and sludge stabilization. As a first experiment, an optimum PAC dose for efficient gas production was determined in a batch test. In semi-continuous experiments, an optimum Sludge Retention Time (SRT) at that PAC concentration and an overall substate utilization rate coefficient were investigated. A portion of gas increased by PAC addition was estimated using a substrate utilization rate coefficient of microorganisms attached on PAC. This test was performed in batch experiments using acetic acid as a substrate. The digesters for all experiments were kept 35${\pm}$ 1˚C in a heated water bath. Mixing was performed manually once a day and the produced gas was collected for daily reading. The following conclusions were made for this study. 1. Cptimum PAC concentration was 5% total solids, where gas production rate was increased by 20 percents. 2. Optimum SRT was 7.5 days. 3. Substrate utilization rate coefficient of microorganisms attached on PAC was about twice as much as that of suspended ones.

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가용화장치 및 가스정제 설비에 의한 슬러지 소화 효율 향상에 관한 연구 (A Study on the Improvement of Sludge Digestion Efficiency by Solubilization Equipment and Gas Purification System)

  • 장성호;이병인;이용대;김한수;조한진;류재용;김상우
    • 한국환경과학회지
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    • 제23권5호
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    • pp.853-859
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    • 2014
  • The purpose of this study was to improve low digestibility in anaerobic digestion facility of the sewage treatment plant. To perform this research, sludge digestion and digestion gas purification facilities in sewage treatment plant was applied. In the result of this study, it was very effective for sludge reduction from the improvement of digestive efficiency. In addition, it was confirmed that high purity $CH_4$ (methane) was produced. This results can be useful as basic data to improve the low digestibility in anaerobic digestion processes.

단속식 침출수 순환형 음식물류 폐기물 혐기성 소화 공법에 대한 실험적 특성 파악 (Experimental Evaluation of Intermittent Leachate Recirculation Anaerobic System to digest Source from Separated Food Waste)

  • 이제승;이병희
    • 유기물자원화
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    • 제22권2호
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    • pp.57-66
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    • 2014
  • 침출수 순환형 음식물류 폐기물 혐기성 소화 공법은 기존의 일상 혐기성 소화 공법에 비해 투입되는 유기물 부하량 대비 발생하는 메탄가스 수율이 높다는 장점이 있다. 본 연구는 분리 수거된 교내 기숙사 식당 음식물류 폐기물과 하수처리장 혐기성 소화조의 혐기성 미생물을 이용하여 신재생 에너지인 메탄가스를 더욱 효율적으로 얻기 위해 음식물류 폐기물/혐기성 슬러지 비를 달리하여 실험을 실시하였다. 음식물류 폐기물/혐기성 슬러지 비가 2:8이고 유기물 부하율이 9 gVS/L인 침출수 순환형 음식물류 혐기성 소화 반응조의 바이오 가스 발생이 가장 높았다. 또한 이 혐기성 반응조에서 발생하는 바이오가스 내부의 $H_2S$$NH_3$가 지속적으로 감소하였고 바이오 가스의 수율은 평균 $1.395m^3$ Biogas/kg VS added로 나타났다. 이에 비해 나머지 음식물류 폐기물/혐기성 슬러지 비가 3:7, 8:2인 실험의 반응조에서는 바이오 가스 발생이 멈추었다.

中溫및 高溫嫌氣性消化에 의한 豚糞處理 (Mesophilic and Thermophilic Anaerobic Digestion of Swine Manure)

  • Kim, Nam Cheon;Min, Kyung Sok;Chung, Paul Gene
    • 한국환경보건학회지
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    • 제10권1호
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    • pp.107-117
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    • 1984
  • This study was made to evaluate the temperature effects on anaerobic digestion of swine manure. A laboratory single-stage, high-rate, anaerobic digester was operated at 10, 20 and 30 day's HRT at the temperature of 35$\circ$C or 55$\circ$C. The conclusions from this study are as follows: (1) COD and BOD reductions were similar in both the mesophilic and thermophilic digestions. (2) With thermophilic digestion, volatile reduction increased to 67%, as compared with 60% of mesophilic digestion. With thermophilic digestion, the pH increased to 8.5 as compared with 8.0 of mesophilic digestion. With thermophilic digestion, the concentration of volatile acid increased to 763 mg/l, as compared with 250 mg/l of mesophilic digestion. While the gas was produced by mesophilic digestion at 0.74m$^3$/kg of VS fed, it increased to 0.87 m$^3$/kg VS fed by thermophilic digestion. The refractory VS was about 25% of the infiuent VS.

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