• Title/Summary/Keyword: 혐기성소화조

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The Methane Production from Organic Waste on Single Anaerobic Digester Equipped with MET (Microbial Electrochemical Technology) (미생물 전기화학 기술이 설치된 단일 혐기성소화조에서 유기성폐기물로부터 메탄생성)

  • Park, Jungyu;Tian, Dongjie;Lee, Beom;Jun, Hangbae
    • Journal of Korean Society of Environmental Engineers
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    • v.38 no.4
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    • pp.201-209
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    • 2016
  • Theoretical maximum methane yield of glucose at STP (1 atm, $0^{\circ}C$) is 0.35 L $CH_4/g$ COD. However, most researched actual methane yields of anaerobic digester (AD) on lab scale is lower than theoretical ones. A wide range of them have been reported according to experiments methods and types of organic matters. Recent year, a MET (Microbial electrochemical technology) is a promising technology for producing sustainable bio energies from AD via rapid degradation of high concentration organic wastes, VFAs (Volatile Fatty Acids), toxic materials and non-degradable organic matters with electrochemical reactions. In this study, methane yields of food waste leachate and sewage waste sludge were evaluated by using BMP (Biochemical Methane Potential) and continuous AD tests. As the results, methane production volume from the anaerobic digester equipped with MET (AD + MET) was higher than conventional AD in the ratio of 2 to 3 times. The actual methane yields from all experiments were lower than those of theoretical value of glucose. The methane yield, however, from the AD + MET occurred similar to the theoretical one. Moreover, biogas compositions of AD and AD + MET were similar. Consequently, methane production from anaerobic digester with MET increased from the result of higher organic removal efficiency, while, further researches should be required for investigating methane production mechanisms in the anaerobic digester with MET.

Study on maximization and demonstration of biogas production in an anaerobic digester using a microbial agent (미생물제재를 이용한 혐기성소화조 바이오가스 생산 극대화와 실증화에 관한 연구)

  • Bae, Sang-Dae
    • The Journal of the Convergence on Culture Technology
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    • v.4 no.2
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    • pp.179-183
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    • 2018
  • Recently, several studies have been conducted on biogas and organic compost production using food waste in an anaerobic digester. In this study, basic experiments were conducted to produce biogas and compost by fermenting food wastes with microbial agents. First, a microbial agent was developed by combining various microorganisms. Then, the amount of generated biogas was identified through a food waste batch experiment. Further, we could maximize and demonstrate biogas production in an anaerobic digester by examining biogas production and composting in a pilot plant.

Ferric Chloride Addition Enhances Performance of Bioelectrochemical Anaerobic Digestion of Sewage Sludge at Ambient Temperature (제2철 이온을 이용한 상온조건에서 하수슬러지의 생물전기화학 혐기성소화 성능향상)

  • Feng, Qing;Song, Young-Chae;Jang, Seong-Ho
    • Journal of Korean Society of Environmental Engineers
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    • v.38 no.11
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    • pp.618-626
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    • 2016
  • The influence of ferric ion ($Fe^{+3}$) on bioelectrochemical anaerobic digestion for sewage sludge was explored at ambient temperature ($25^{\circ}C$). Before the addition of ferric ion, the removal of volatile solids (VS) was 65.9% and the specific methane production rate was 370 mL/L/d. After the addition of ferric ion (200 ppm) to feed sludge, the bioelectrochemical anaerobic digester was more stable in the state variables including pH, alkalinity, COD and VFAs, and the VS removal and specific methane production rate were increased to 69.8% and 396 mL/L/d, respectively. However, the methane content in biogas was slightly reduced by the addition of ferric ion, indicating that the activity of planktonic anaerobic bacteria (PAB) was more improved after the addition of ferric ion. The dominances of syntrophic bacteria (Cloacamonas) and hyrolytic bacteria (Saprospiraceae, Ottowia pentelensis) in the PAB were increased by the addition of ferric ion. The addition of ferric ion improved the performance of bioelectrochemical anaerobic digestion for sewage sludge at ambient temperature.

Effect of Waste Activated Sludge Mixing Ratio on the Biogas Production in Bioelectrochemical Anaerobic Digestion (생물전기화학혐기소화조를 이용한 바이오가스생산에서 폐활성슬러지 혼합비의 영향)

  • Chung, Jae-Woo;Lee, Myoung-Eun;Seo, Sun-Chul;Ahn, Yongtae
    • Journal of the Korea Organic Resources Recycling Association
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    • v.26 no.4
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    • pp.53-61
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    • 2018
  • Anaerobic digestion (AD) is one of the most widely used process that can convert the organic fraction of waste activated sludge (WAS) into biogas. However, most researched actual methane yields of anaerobic digester (AD) on lab scale is lower than theoretical ones. Bioelectrochemical, anaerobic digester was used to increase methane yield from waste activated sludge. The influence of anaerobic digestion sludge and raw sludge mixing ratio (3:7, 5:5) on methane yield and organic matter removal efficiency were explored. As a result, when the mixing ratio of bioelectrochemical anaerobic sludge was 5:5 compared with 3:7, the highest methane yields were 294.2 mL $CH_4/L$ (0.63 times increase) and 52.5% (7.5% increase), the bioelectrochemical anaerobic digester(5:5) was more stable in the pH, t otal alkalinity and VFAs, respectively. These results showed that the increase in the mixing ratio of anaerobic digestion sludge was found to be effective for maintaining the stable performance of bioelectrochemical anaerobic digester.

Characteristics of Siloxane Concentrations in Bio Gas from Anaerobic Digestion of Food Wastewater (음식물류폐기물폐수의 혐기성 소화에서 바이오가스의 실록산 농도 특성)

  • Lee, Chae-Young;Lee, Se-Wook;Park, Su-Hee;Hur, Kwang-Beom;Kim, Hae-Ryong;Lee, Nam-Hoon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.19 no.4
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    • pp.60-65
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    • 2011
  • Siloxane is an organic silicon compound and is volatilized into the bio gas from anaerobic digestion. It causes failure of gas combustion engines using the bio gas. Siloxane emission characteristics should be identified to provide a proper siloxane control. This study focuses on characterizing siloxane emission in bio gas from an anaerobic digester of food wastewater operating from January to March. The concentrations of total average siloxane and cycle-siloxane D4 were detected to be 9.5 and $4.0mg\;siloxane/m^3$, respectively. The concentrations of cycle-siloxane and linear-siloxane were resulted in D4>D5>D6 and L4>L3>L5>L2, respectively. The total siloxane concentration was the lowest in January and the highest in March.

Effect on Digestion Efficiency by Adding Microbial Agent in Mesophilic Two-stage Anaerobic Digester (중온2단혐기성소화조에 미생물제재 주입시 소화효율에 미치는 영향)

  • Jung, Byung-Gil;Kim, Seok-Soon;Kang, Dong-Hyo;Sung, Nak-Chang;Choi, Seung-Ho;Lee, Hee-Pom
    • Journal of the Korea Organic Resources Recycling Association
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    • v.11 no.3
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    • pp.75-86
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    • 2003
  • In the near future, the capacity of conventional anaerobic digester is thought to be insufficient because of the increase of the total solids from expansion of intercepting sewer, sewage quantity and direct input of night soil from near apartment districts. The objectives of this study was to investigate the improvement of digestion efficiency using microbial agent(Bio-dh). The system was a pilot-scale, two-staged, anaerobic sludge digestion system. The first-stage digester was heated and mixed. The agitation velocity of the first-stage digester was 120rpm. The second-stage digester was neither heated nor mixed. The Digestion temperature was kept at $35{\pm}1^{\circ}C$ The detention time of digester was 19 days. The dosage of sewage sludge and microbial agent were $0.65m^3/day$ and $0.5{\ell}/day$, respectively. The experiments was run for 25days. Three times a week, $COD_{Mn}$ and SS of effluent, TS, VS, and biogas production rate were measured. Temperature, pH, and alkalinity were measured daily. The results were as follows ; Without microbial agent, digestion efficiencies ranged 46.0%~50.9%(mean=48.6%), with microbial agent(Bio-dh), digestion efficiencies ranged 52.8%~57.3%(mean=54.2%). Consequently, microbial agent(Bio-dh) increased the sludge digestion efficiency about 12%. Also, Without microbial agent, the mean concentration of $COD_{Mn}$ and SS of second-stage digester effluent were 1,639mg/L, 4,888mg/L respectively. With microbial agent, the mean concentration of $COD_{Mn}$ and SS of second-stage digester effluent were 859mg/L, 2,405mg/L respectively. Consequently, microbial agent(Bio-dh) increased the removal efficiency of $COD_{Mn}$ and SS about 47.6% and 50.8%, respectively.

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A Study of the Improvement in an Anaerobic Digester for Sludge Reduction (슬러지 저감을 위한 혐기성 소화조 개선에 관한 연구)

  • Kim, Hong-Seok;Lee, Tae-Jin
    • Journal of Korean Society of Environmental Engineers
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    • v.33 no.7
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    • pp.516-522
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    • 2011
  • The largest problem of domestic anaerobic digestion is low digestion efficiency. Reasons of the problem would be low organic matters input, low mixing efficiency in digestion tank, refractory excess sludge etc.. In this study, screw attached disk-type concentration system and a mechanical mixing system, solubilization facility improvements were performed to solve problems. Through these improvements, the sludge conc. of the concentrator increased 2.6-fold and the volume reduction efficiency was increased 3.0-fold. In addition, the dead-space is reduced by mechanical agitation. Anaerobic digester gas production in the digestion tank is increased from $193.8m^3$ to $386.0m^3$ per day. Digestion efficiency is improved to 54.6% from 47.6%. Digestion gas production is increased from $0.30Nm^3/kg$ VS to $0.42Nm^3/kg$ VS.

The Effect of Solubilization Pretreatment Process on Anaerobic Digestion of Waste Activated Sludge (전처리 가용화 공정이 잉여슬러지 혐기성 소화효율에 미치는 영향)

  • Yoo, Ho-Sik;Ahn, Seyoung
    • Journal of the Korea Organic Resources Recycling Association
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    • v.24 no.3
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    • pp.35-43
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    • 2016
  • COD properties of waste activated sludge (WAS) were investigated for various solubilization rate of mechanical pretreatment method in anaerobic digestion process. Inert COD was 37.0% of total COD in untreated WAS. Particulate biodegradable COD was converted to soluble biodegradables and particulate unbiodegradables as solubilization was processed. Particulate unbiodegradable portion of COD in WAS can be increased as particulate biodegradable portion is decreased in case of relatively long SRT of biological treatment. Thus, COD properties of WAS should be investigated in case of relatively low particulate biodegradable COD, because of possible low effect of solubilization. COD removal rate in anaerobic digester was enhanced as much as 2.1% and 15.1% for solubilization rate 5% and 35% due to pretreatment, respectively. COD removal rate was increased from 25% to 40%, and methane gas generation was increased from $607m^3/d$ to $907m^3/d$ as particulate COD of WAS was solubilized to 35% in pretreatment facilities.