《Table 2 Process performance of UASB for hydrogen production》

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《F/M比和HRT对两相厌氧产氢产甲烷系统的影响（英文）》

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HAc:acetate acid；HBu:butyrate acid；HPr:propionate acid；EtOH:ethanol；TVFAs（total volatile fatty acid）=HAc+HBu+HPr+EtOH.

According to Table 2，during production of hydrogen with F/M from 2.5 to 7.5，system ORP ranged between（-395±12）m V and（-406±7）m V.With inlet p H of feed being adjusted to 7.0 prior to feeding，system p H varied between（4.54±0.09）and（4.78±0.07）.The pH range would effectively block the bioactivities of methanogenic Alkalinity was kept at the level of above（0.26±0.018）g/L which could effectively buffer the pH fluctuation.The main metabolites were found to be ethanol，acetate，butyrate and a small amount of propionate（Table 2）.The total VFAs concentration varied in the range of（1.66±0.06）~（2.0±0.14）g/L.Experimental data revealed the persistence of ethanol-forming pathway with fraction of ethanol from（48.7±2.3）to（54.2±2.7）%and butyrate-forming pathway with fraction of butyrate from（21.9±6.1）to（23.8±7.7）%.The fermentation pathway in UASB system indicated the microenvironment was favorable for hydrogen production corresponding to high hydrogen production rate.However，at F/M of 10，the system has a trend of paralysis due to the pH reduction and VFAs accumulation.