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首页> 外文期刊>Fuel >An alternative for value aggregation to the sugarcane chain: Biohydrogen and volatile fatty acids production from sugarcane molasses in mesophilic expanded granular sludge bed reactors
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An alternative for value aggregation to the sugarcane chain: Biohydrogen and volatile fatty acids production from sugarcane molasses in mesophilic expanded granular sludge bed reactors

机译:甘蔗链价值聚合的替代方法:中温膨胀式颗粒污泥床反应器中的甘蔗糖蜜生产生物氢和挥发性脂肪酸

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摘要

The main objective of this study was to investigate the influence of hydraulic retention time (HRT) (24-1 h) on continuous biohydrogen production from sugarcane molasses in three expanded granular sludge bed (EGSB) reactors under mesophilic conditions (30 +/- 1 degrees C). The sugarcane molasses concentrations were 5 g (EGSB-5), 10 g L-1 (EGSB-10) and 15 g L-1 (EGSB-15). In EGSB-5, hydrogen was not detected. The main volatile fatty acids produced were acetic (30.0-50.0%), butyric (13.0-30.0%) and propionic (13.0-45.0%) acids. In this reactor, the formation of acetic acid through the homoacetogenesis reaction (23-51%) explains the absence of hydrogen. The maximum hydrogen production rates were observed at an HRT of 1 h in EGSB-10 (4.56 L day(-1)L (-1)) and EGSB-15 (13.92 L day(-1) L-1). The main metabolites detected in EGSB-10 and EGSB- were butyric (8.0-51.0%), lactic (6.0-50.0%) and propionic (4.0-57.0%) acids. The metabolic pathways responsible for hydrogen production in both reactors were similar and were associated with increased production of butyric acid and lactic acid, thus explaining the low hydrogen yields (maximum of 0.25 mol H-2 mol(-1) hexose).
机译:这项研究的主要目的是研究在中温条件下(30 +/- 1),水力停留时间(HRT)(24-1 h)对三个膨胀的颗粒污泥床(EGSB)反应器中甘蔗糖蜜连续生产生物氢的影响。摄氏度)。甘蔗糖蜜的浓度为5 g(EGSB-5),10 g L-1(EGSB-10)和15 g L-1(EGSB-15)。在EGSB-5中,未检测到氢。产生的主要挥发性脂肪酸为乙酸(30.0-50.0%),丁酸(13.0-30.0%)和丙酸(13.0-45.0%)。在该反应器中,通过均相产乙酸反应形成乙酸(23-51%)说明了氢的缺乏。在EGSB-10(4.56 L day(-1)L(-1))和EGSB-15(13.92 L day(-1)L-1)的HRT为1 h时,观察到最大的产氢速率。在EGSB-10和EGSB-中检测到的主要代谢产物为丁酸(8.0-51.0%),乳酸(6.0-50.0%)和丙酸(4.0-57.0%)。在两个反应器中负责产氢的代谢途径是相似的,并且与丁酸和乳酸的增加产量相关,因此可以解释低氢产率(最大0.25 mol H-2 mol(-1)己糖)。

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