The effects of organic loading rates (OLRs) on fermentative productions of hydrogen and ethanol were investigated in a continuous stirred tank reactor (CSTR) with attached sludge using molasses as substrate. The CSTR reactor with attached sludge was operated under different OLRs, ranging from 8 to 24 kg/m3·d. The H2 and ethanol production rate essentially increased with increasing OLR. The highest H2 production rate (10.74 mmol/h·L) and ethanol production rate (11.72 mmol/h·L) were obtained both operating at OLR = 24 kg/m3·d. Linear regression results show that ethanol production rate (y) and H2 production rate (x) were proportionately correlated and can be expressed as y = 1.5365x − 5.054 (r2 = 0.9751). The best energy generation rate was 19.08 kJ/h·L, which occurred at OLR = 24 kg/m3·d. In addition, the hydrogen yield was affected by the presence of ethanol and acetic acid in the liquid phase, and the maximum hydrogen production rate occurred while the ratio of ethanol to acetic acid was close to 1.
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机译：在以糖蜜为底物的污泥附着的连续搅拌釜反应器（CSTR）中，研究了有机负载率（OLR）对发酵产生的氢气和乙醇的影响。带有污泥的CSTR反应器在8至24 Okg / m 3 ·d的不同OLR下运行。随着OLR的增加，H2和乙醇的生产速率基本增加。在OLR = 24 kg / m 3 条件下，制氢率最高（10.74 mmol / h·L）和乙醇产率（11.72 mmol / h·L）。线性回归结果表明，乙醇生产率（y）和氢气生产率（x）成比例相关，可以表示为y = 1.5365x-5.054（r 2 = 0.9751）。最佳能量产生速率为19.08 kJ / h·L，发生在OLR = 24 kg / m 3 ·d时。另外，液相中乙醇和乙酸的存在会影响氢气的产率，并且当乙醇与乙酸的比例接近于1时会出现最大的氢气产生速率。
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