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Effect of control parameters on biogas production during the anaerobic digestion of protein-rich substrates

机译：富蛋白质底物厌氧消化过程中控制参数对沼气产生的影响

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This paper deals with the theoretical study of the anaerobic digestion of protein-rich substrates. Since the success of such digestion raises the issue of the possible release of ammonia, we have carried out a mathematical analysis of an Anaerobic Digestion model specifically developed for the treatment of Microalgae, termed MAD (Microalgae Anaerobic Digestion) in the literature. Our aim is to investigate the qualitative properties of the system via the calculation of its equilibria, their conditions of existence as well as their stability according to the operating parameters values. Simulation results highlight the key parameters acting on model behavior. In particular, it is shown that the control parameters can greatly affect biogas yield and, thus, process performance. The optimal conditions for process operation are then identified. To emphasize the effect of pH on biological reactions, we plot the operating diagram of the MAD model for different fixed pH values. We demonstrate that a rising pH favors the formation of the free ammonia, leading ultimately to methanogen inhibition. Surprisingly, our study highlights the insensitivity of the model to acidic environments, thus limiting its potential applications at low pH. Finally, we investigate the qualitative and quantitative properties of a modified ADM1 (Anaerobic Digestion Model no1) model in the light of those of the MAD model.
机译：本文涉及厌氧消化富含蛋白质的底物的理论研究。由于这种消化的成功提出了可能释放氨的问题，因此我们对专门为处理微藻开发的厌氧消化模型进行了数学分析，该模型在文献中称为MAD（微藻厌氧消化）。我们的目的是根据系统的平衡度，系统的存在条件以及根据运行参数值的稳定性来研究系统的定性性质。仿真结果突出了影响模型行为的关键参数。特别地，表明控制参数可以极大地影响沼气产量，从而影响工艺性能。然后确定过程操作的最佳条件。为了强调pH值对生物反应的影响，我们绘制了针对不同固定pH值的MAD模型的操作图。我们证明，升高的pH值有利于游离氨的形成，最终导致产甲烷菌的抑制。出人意料的是，我们的研究突出了该模型对酸性环境的不敏感性，从而限制了其在低pH下的潜在应用。最后，根据MAD模型的特征，我们研究了改良的ADM1（厌氧消化模型1）模型的定性和定量特性。

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