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首页> 外文期刊>Applied and Environmental Microbiology >Metabolic Activity of Fatty Acid-Oxidizing Bacteria and the Contribution of Acetate, Propionate, Butyrate, and CO2 to Methanogenesis in Cattle Waste at 40 and 60°C
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Metabolic Activity of Fatty Acid-Oxidizing Bacteria and the Contribution of Acetate, Propionate, Butyrate, and CO2 to Methanogenesis in Cattle Waste at 40 and 60°C

机译：脂肪酸氧化细菌的代谢活性以及40和60°C下牛粪中甲烷，乙酸，丙酸，丁酸和CO2对甲烷化的贡献

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The quantitative contribution of fatty acids and CO2 to methanogenesis was studied by using stirred, 3-liter bench-top digestors fed on a semicontinuous basis with cattle waste. The fermentations were carried out at 40 and 60°C under identical loading conditions (6 g of volatile solids per liter of reactor volume per day, 10-day retention time). In the thermophilic digestor, acetate turnover increased from a prefeeding level of 16 μM/min to a peak (49 μM/min) 1 h after feeding and then gradually decreased. Acetate turnover in the mesophilic digestor increased from 15 to 40 μM/min. Propionate turnover ranged from 2 to 5.2 and 1.5 to 4.5 μM/min in the thermophilic and mesophilic digestors, respectively. Butyrate turnover (0.7 to 1.2 μM/min) was similar in both digestors. The proportion of CH4 produced via the methyl group of acetate varied with time after feeding and ranged from 72 to 75% in the mesophilic digestor and 75 to 86% in the thermophilic digestor. The contribution from CO2 reduction was 24 to 29% and 19 to 27%, respectively. Propionate and butyrate turnover accounted for 20% of the total CH4 produced. Acetate synthesis from CO2 was greatest shortly after feeding and was higher in the thermophilic digestor (0.5 to 2.4 μM/min) than the mesophilic digestor (0.3 to 0.5 μM/min). Counts of fatty acid-degrading bacteria were related to their turnover activity.
机译：通过使用半连续饲喂牛粪的搅拌式3升台式消化池，研究了脂肪酸和CO2对甲烷生成的定量贡献。发酵是在40和60°C相同的负载条件下进行的（每升反应器体积每天6 g挥发性固体，保留10天）。在嗜热消化池中，醋酸盐周转率从进料后16 h / min的预进料水平增加到进料1 h后的峰值（49μM/ min），然后逐渐下降。中温消化池中的乙酸盐转化率从15μM/ min增加到40μM/ min。在嗜热和中温消化池中，丙酸的周转率分别为2至5.2和1.5至4.5μM/ min。两种消化池的丁酸盐周转率（0.7至1.2μM/ min）相似。进料后，通过乙酸甲酯产生的CH4比例随时间变化，在嗜温消化池中为72-75％，在嗜热消化池中为75-86％。减少二氧化碳的贡献分别为24％至29％和19％至27％。丙酸和丁酸的营业额占CH4产生总量的20％。进食后不久，由CO2合成的乙酸盐最大，并且在嗜热消化池中（0.5至2.4μM/ min）高于嗜温消化池（0.3至0.5μM/ min）。脂肪酸降解菌的数量与其周转活性有关。

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