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首页> 外文期刊>Applied Microbiology and Biotechnology >Mesophilic and thermophilic anaerobic digestion of source-sorted organic wastes: effect of ammonia on glucose degradation and methane production
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Mesophilic and thermophilic anaerobic digestion of source-sorted organic wastes: effect of ammonia on glucose degradation and methane production

机译：源分类有机废物的中温和厌氧厌氧消化：氨对葡萄糖降解和甲烷产生的影响

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The wet organic fraction of household wastes was digested anaerobically at 37 degrees C and 55 degrees C. At both temperatures the volatile solids loading was increased from l g l(-1) day(-1) to 9.65 g l(-1) day(-1), by reducing the nominal hydraulic retention time from 93 days to 19 days. The volatile solids removal in the reactors at both temperatures for the same loading rates was in a similar range and was still 65% at 19 days hydraulic retention time. Although more biogas was produced in the thermophilic reactor, the energy conservation in methane was slightly lower, because of a lower methane content, compared to the biogas of the mesophilic reactor. The slightly lower amount of energy conserved in the methane of the thermophilic digester was presumably balanced by the hydrogen that escaped into the gas phase and thus was no longer available for methanogenesis. In the thermophilic process, 1.4 g/l ammonia was released, whereas in the mesophilic process only 1 g/l ammonia was generated, presumably from protein degradation. Inhibition studies of methane production and glucose fermentation revealed a K-i (50%) of 3 g/l and 3.7 g/l ammonia (equivalent to 0.22 g/l and 0.28 g/l free NH3) at 37 degrees C and a K-i (50%) of 3.5 g/l and 3.4 g/l ammonia (equivalent to 0.69 g/l and 0.68 g/l free NH3) at 55 degrees C. This indicated that the thermophilic flora tolerated at least twice as much of free NH3 than the mesophilic flora and, furthermore, that the thermophilic flora was able to degrade more protein. The apparent ammonia concentrations in the mesophilic and in the thermophilic biowaste reactor were low enough not to inhibit glucose fermentation and methane production of either process significantly, but may have been high enough to inhibit protein degradation. The data indicated either that the mesophilic and thermophilic protein degraders revealed a different sensitivity towards free ammonia or that the mesophilic population contained less versatile protein degraders, leaving more protein undegraded.
机译：在37°C和55°C下厌氧消化生活垃圾中的湿有机部分。在这两个温度下，挥发性固体负荷从lgl（-1）天（-1）增加到9.65 gl（-1）天（-1） ），将名义水力停留时间从93天减少到19天。在相同温度下，两种温度下反应器中挥发性固体的去除率都在相似的范围内，在水力停留时间为19天时仍为65％。尽管在嗜热反应器中产生的沼气更多，但与中温反应器的沼气相比，由于甲烷含量较低，甲烷的能量守恒略低。嗜热消化池甲烷中守恒的能量略低，大概是由于逃逸到气相中的氢气所平衡，因此不再可用于甲烷化。在嗜热过程中，释放出1.4 g / l的氨，而在嗜温过程中，仅产生了1 g / l的氨，大概是由于蛋白质降解所致。甲烷产生和葡萄糖发酵的抑制研究显示，在37摄氏度下，Ki（50％）为3 g / l和3.7 g / l氨（相当于0.22 g / l和0.28 g / l游离NH3） ％）在55摄氏度下的3.5 g / l和3.4 g / l氨（相当于0.69 g / l和0.68 g / l的游离NH3）。这表明嗜热菌群对游离NH3的耐受性至少是吸附的两倍。嗜温菌群，此外，嗜热菌群能够降解更多的蛋白质。中温和嗜热生物废物反应器中的表观氨浓度足够低，不能明显抑制任一过程的葡萄糖发酵和甲烷生成，但可能足够高，可以抑制蛋白质降解。数据表明，嗜温和嗜热的蛋白质降解物显示出对游离氨的不同敏感性，或者嗜温的群体包含的通用蛋白质降解物较少，而更多的蛋白质未被降解。

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