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首页> 外文期刊>Journal of environmental science and health >Kinetics study of fermentative hydrogen production from liquid swine manure supplemented with glucose under controlled pH
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Kinetics study of fermentative hydrogen production from liquid swine manure supplemented with glucose under controlled pH

机译:pH控制条件下猪猪粪补充葡萄糖发酵制氢的动力学研究

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Kinetics of H_2 production from liquid swine manure supplemented with glucose by mixed anaerobic cultures was investigated using batch experiments under four different pH conditions (4.4, 5.0, 5.6, and uncontrolled). The temperature for the experiments was controlled at 37 ± 1℃ and the length of experiments varied between 50 and 120 hours, depending upon the time needed for completion of each individual experiment. The modified Gompertz model was evaluated for its suitability for describing the H_2 production potential, H_2 production rate, and substrate consumption rate for all the experiments. The results showed that the Gompertz model could adequately fit the experimental results. The effect of pH was significant on all kinetic parameters for H_2 production including yield, production rate and lag time, and the substrate utilization rate. The optimal pH was found to be 5.0, at which a maximum H_2 production rate (0.64 L H_2/h) was obtained, and deviation from the optimal pH could result in substantial reductions in H_2 production rate (0.32 L H_2/h for pH 4.0 and 0.43 L H_2/h for pH 5.6). The results also showed that if pH was not controlled for the batch fermentation process, the substrate utilization efficiency could steeply decrease from 98.8% to 33.7%.
机译:在四个不同的pH条件(4.4、5.0、5.6和不受控制)下,使用分批实验研究了混合厌氧培养液补充葡萄糖后从猪粪中生产H_2的动力学。实验温度控制在37±1℃,实验时间在50到120小时之间变化,具体取决于完成每个实验所需的时间。评估了改进的Gompertz模型的适用性,以描述所有实验的H_2生产潜力,H_2生产速率和底物消耗速率。结果表明,Gompertz模型可以充分拟合实验结果。 pH值对H_2生产的所有动力学参数(包括产量,生产率和滞后时间以及底物利用率)均具有显着影响。发现最佳pH为5.0,在该pH下可获得最大H_2产生速率(0.64 L H_2 / h),偏离最佳pH可能导致H_2产生速率显着降低(pH 4.0时为0.32 L H_2 / h) pH为5.6时为0.43 L H_2 / h)。结果还表明,如果不控制分批发酵过程的pH值,底物的利用效率可能会从98.8%急剧下降至33.7%。

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