• Title/Summary/Keyword: Methane production rate

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Continuous methanol synthesis directly from methane and steam over Cu(II)-exchanged mordenite

  • Lee, Sae Ha;Kang, Jong Kyu;Park, Eun Duck
    • Korean Journal of Chemical Engineering
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    • v.35 no.11
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    • pp.2145-2149
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    • 2018
  • The formation of methanol directly from methane and steam was observed over Cu ion-exchanged mordenite. Furthermore, the continuous production of methanol was achieved by co-feeding methane and steam over Cumordenite. The methanol production rate was comparable to that reported in the stepwise process in which activation, methane reaction, and extraction of methanol were carried out separately.

Characteristics of Methane Production from Piggery Manure Using Anaerobic Digestion (혐기성 소화를 통한 돈분의 메탄 생성 특성)

  • Lee, Chae-Young
    • Journal of the Korea Organic Resources Recycling Association
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    • v.15 no.3
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    • pp.113-120
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    • 2007
  • Anaerobic batch tests were performed to evaluate the characteristics of methane production from piggery manure such as the ultimate methane yield (UMY), the kinetic constant and the maximum methane production rate. The kinetic behavior of anaerobic degradation of piggery manure was assumed as a first order reaction. The UMY, the first order kinetic constant and the maximum methane production rate were 0.27~0.44L $CH_4/gVS$, $0.161{\sim}0.280d^{-1}$ and 0.043~0.120L $CH_4/d$, respectively. Reactor of piggery manure as the self-seed source of anaerobic digestion resulted in longer acclimation time than reactors seeded with anaerobic digested sludge (ADS). But there was no little difference in the UMY between the two seed materials. The anaerobic digestion can be effective for the treatment of piggery manure containing high concentration of solids, the two-stage anaerobic digestion is, however, thought to be more effective than the traditional single one.

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Potential Methane Production on Anaerobic Co-digestion of Swine Manure and Food Waste

  • Shin, Joung-Du;Park, Sang-Won;Kim, Sang-Hyoun;Duangmanee, Jack;Lee, Po-Heng;Sung, Shi-Hwu;Lee, Bong-Hoon
    • Korean Journal of Environmental Agriculture
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    • v.27 no.2
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    • pp.145-149
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    • 2008
  • Anaerobic co-digestion of swine manure and food waste for biogas production was performed in serum bottles at various volatile solids(VS) contents and mixing ratios of two substrates(swine manure:food waste=$100:0{\sim}0:100$). Through kinetic mode of surface methodology, the methane production was fitted to a Gompertz equation. The ultimate methane production potential of swine manure alone was lower than that of food waste regardless of VS contents. However, it was appeared that maximum methane production potentials in 80 : 20 of the mixing rate at VS 3% was enhanced at 144.7%, compared to its only swine manure. The potential increased up to 815.71 ml/g VS fed as VS concentration and food composition increased up to 3.0% and 20%, respectively. The ultimate amount of methane produced had significantly a positive relationship with that of methane yield rate. Overall, it would be strongly recommended that feeding stocks use 20% of mixing ratio of food waste based on VS 3% contents when operating the anaerobic reactor on site at $35^{\circ}C$ if not have treatment of its anaerobic waste water.

Net Methane Oxidation Performance of Anaerobic Sewage Sludge

  • Yi, Taewoo;Kim, Tae Gwan;Lee, Eun-Hee;Lee, Jung-Hee;Cho, Kyung-Suk
    • Journal of Microbiology and Biotechnology
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    • v.22 no.10
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    • pp.1452-1456
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    • 2012
  • The anaerobic oxidation of methane (AOM) in anaerobic sewage sludge was characterized. The net methane oxidation was observed in samples amended with methane plus sulfate or with methane alone, whereas methane formation was observed in the samples without methane, indicating that methane oxidation and formation occurred simultaneously. The ratio of the net methane oxidation rate to $H_2S$ formation was 100:1, suggesting that the AOM was not closely associated with sulfate reduction in the anaerobic sludge. The net AOM was positively associated with the methane concentration and sludge dilution ratio. However, the rate of AOM was negatively correlated with organic substrate (acetate) concentration. Therefore, the production and oxidation of methane could be controlled by environmental conditions and dissolved organic compounds in the bulk solution.

Methane Production and Nitrogen Removal from Piggery Wastewater in the TPAD Coupled with BNR Process (질소제거공정과 결합한 2상 혐기성 소화공정에서 돈분폐수의 메탄생성 및 질소제거)

  • Park, Noh-Back;Park, Sang-Min;Choi, Woo-Young;Jun, Hang-Bae
    • Journal of Korean Society on Water Environment
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    • v.25 no.1
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    • pp.18-25
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    • 2009
  • Nitrogen removal and methane production from piggery wastewater were investigated in two-phase anaerobic digestion (TPAD) coupled with biological nitrogen removal (BNR) process at $35^{\circ}C$. Methane production rate was about $0.7L/L{\cdot}day$ at organic loading rate (OLR) of $1.2g{\cdot}TCOD/L{\cdot}day$ in methanogenic UASB. Conversion efficiency of the removed TCOD into methane in UASB was as high as 72% and overall TCOD removal efficiency in this system was over 97%. Ammonia nitrogen were stably removed in BNR system and overall efficiency were 98%. With recirculation of the nitrified final effluent to TPAD, nitrogen oxides were completely removed by anaerobic denitrification in the acidogenic reactor, which did not inhibit the acidogenic activities. Overall TN removal efficiency in the TPAD-BNR system was as high as 94%.

Effect of organic concentration on its degradation kinetics in a burial site (매몰지 내 유기물 농도가 분해 속도에 미치는 영향)

  • Lee, Chae-Young;Choi, Jae-Min;Oh, Seung-Jun;Han, Sun-Kee;Park, Joon-Kyu
    • Journal of the Korea Organic Resources Recycling Association
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    • v.21 no.1
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    • pp.62-68
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    • 2013
  • The effect of organic substance on its degradation rate in burial site was investigated using batch tests. Substrate were swine and cattle with the initial concentrations of 2, 4, 6, 8, and 10 g VS(volatile solids)/L, respectively. The highest methane production rates of swine and cattle were found at 2 g VS/L as 46.3 and 48.4 ml CH4/g VS.d, respectively. As substrate concentration increased, the methane production rate decreased. The inhibition constants were n and m that were estimated using nonlinear inhibition model. The values of n and m were inhibition constants of methane production rate and ultimate methane yield, respectively. The values of n and m were 4.9 and 0.6 on swine and 1.1 and 0.4 on cattle. The methane production rate was responded sensitively by increase and decrease of substrate concentration, whereas ultimate methane yield do not relatively. From a relation between n and m, inhibitory effect of substrate concentration was confirmed as uncompetitive inhibition.

A Study on the Effect of Food size and Washing rate on the Mixed Digestion of food Waste and Sewage Sludge (음식물쓰레기의 슬러지 병합처리에 있어서 입경 및 세척율의 영향)

  • 최성문;김은호;성낙창;김정권;윤태경;임영석
    • Journal of environmental and Sanitary engineering
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    • v.15 no.4
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    • pp.84-90
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    • 2000
  • 5L laboratory-scale anaerobic digester was used to study the effects of food size and washing rate of food waste on the mixed digestion with sewage sludge. Food waste was crushed with particle diameters of 4mm and 2mm and washed two to three times, and seven to eight times before feeding the batch digester. The digester with crushed of washed food waste showed better performance than that with uncrushed of unwashed to produce methane gas of reduce volatile solids. The digester with 2mm food waste showed 17.4% higher VS/TS reduction rate and 18ml higher methane production rate per gram VS input than that with uncrushed food waste, where VS and TS are volatile solid and total solids in the liquid effluent, respectively. Also food waste crushed eight times gave 8% higher VS/TS reduction rate and 11ml higher methane production rate per gram VS input than unwashed food waste.

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Solid Reduction and Methane Production of Food Waste Leachate using Thermal Solubilization (열가용화를 이용한 음식물탈리여액의 고형물 감량화 및 메탄 생산에 관한 연구)

  • Choi, Jung Su;Kim, Hyun Gu;Joo, Hyun Jong
    • Journal of Korean Society on Water Environment
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    • v.30 no.5
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    • pp.559-567
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    • 2014
  • Since the ocean dumping of organic wastes is prohibited under the London Convention, the need for land treatment of food waste leachate (FWL) has significantly been growing in recent years. This study was conducted to use thermal solubilization to turn FWL into a form that can easily be degraded during the anaerobic digestion process, thereby reducing the percentage of solids and increasing the production of methane. To derive the optimal operating conditions of thermal solubilization, a laboratory-scale reactor was built and operated. The optimal reaction temperature and time turned out to be $190^{\circ}C$ and 90 min, respectively. The BMP test showed a methane production of 465 mL $CH_4/g$ $COD_{Cr}$ and a biodegradation rate of 90.1%. The production of methane rose by about 15%, compared with no the application of thermal solubilization. To reduce the solid content of FWL and improve the methane production, therefore, it may be helpful to apply thermal solubilization to pre-treatment facilities for anaerobic digestion.

Hydrogen Gas Production from Methane Reforming Using Oxygen Enriched Compression Ignition Engine (산소부화 압축착화기관을 이용한 메탄으로부터 수소 생산)

  • Lim, Mun-Sup;Hong, Sung-In;Hong, Myung-Seok;Chun, Young-Nam
    • Journal of Korean Society for Atmospheric Environment
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    • v.23 no.5
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    • pp.557-562
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    • 2007
  • The purpose of this paper is to investigate the reforming characteristics and maximum operating condition for the hydrogen production by methane reforming using the compression ignition engine induced partial oxidation. An dedicated compression engine used for methane reforming was decided operating range. The partial oxidation reforming was investigated with oxygen enrichment which can improve hydrogen production, compared to general reforming. Parametric screening studies were achieved as $O_2/CH_4$ ratio, total flow rate, and intake temperature. When the variations of $O_2/CH_4$ ratio, total flow rate, and intake temperature were 1.24, 208.4 L/min, and $400^{\circ}C$, respectively, the maximum operating conditions were produced hydrogen and carbon monoxide. Under the condition mentioned above, synthetic gas were $H_2\;22.77{\sim}29.22%,\;CO\;21.11{\sim}23.59%$.

Study on Characteristic of Methane Reforming and Production of Hydrogen using GlidArc Plasma (GlidArc 플라즈마를 이용한 메탄의 개질 특성 및 수소 생산에 관한 연구)

  • Kim, Seong-Cheon;Chun, Young-Nam
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.31 no.11
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    • pp.942-948
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    • 2007
  • Popular techniques for producing hydrogen by converting methane include steam reforming and catalyst reforming. However, these are high temperature and high pressure processes limited by equipment, cost and difficulty of operation. Low temperature plasma is projected to be a technique that can be used to produce high concentration hydrogen from methane. It is suitable for miniaturization and fur application in other technologies. In this research, the effect of changing each of the following variables was studied using an AC GlidArc system that was conceived by the research team: the gas components ratio, the gas flow rate, the catalyst reactor temperature and voltage. Results were obtained for methane and hydrogen yields and intermediate products. The system used in this research consisted of 3 electrodes and an AC power source. In this study, air was added fur the partial oxidation reaction of methane. The result showed that as the gas flow rate, the catalyst reactor temperature and the electric power increased, the methane conversion rate and the hydrogen concentration also increased. With $O_2/C$ ratio of 0.45, input flow rate of 4.9 l/min and power supply of 1 kW as the reference condition, the methane conversion rate, the high hydrogen selectivity and the reformer energy density were 69.2%, 32.6% and 35.2% respectively.