S/X ratio impacts the profile and kinetics of carboxylic acids production from the acidogenic fermentation of dairy wastewater,Environmental Pollution

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S/X ratio impacts the profile and kinetics of carboxylic acids production from the acidogenic fermentation of dairy wastewater
Environmental Pollution ( IF 7.6 ) Pub Date : 2021-06-16 , DOI: 10.1016/j.envpol.2021.117605
Amanda de Sousa E Silva ₁ , Tasso Jorge Tavares Ferreira ₁ , Naassom Wagner Sales Morais ₁ , Erlon Lopes Pereira ₁ , André Bezerra Dos Santos ₁

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The acidogenic fermentation of dairy wastewater (DW) was evaluated for carboxylic acids (CA) production, investigating the influence of substrate/microorganism (S/X) ratio and applying different mathematical models to the bioproduct formation data. The experiments were performed in batch reactors for 28 days, and four S/X ratios were tested (0.8, 1.2, 1.6, and 1.9 gCOD gVSS). The S/X ratio increase did not influence the percentage of DW conversion into carboxylic acids (42–44%), but the productivity was positively affected (100–200% in general). Acetic acid was the CA formed in the highest concentration for all experiments, followed by propionic and butyric acids. Exponential models were better suited to describe this kinetics process. Therefore, according to the estimated kinetic parameters, the S/X ratio 1.6 was more suitable for CA production from acidogenic fermentation of dairy wastewater, in which the concentrations of longer CA, such as propionate and butyrate, were formed in higher quantities. In addition, it was determined a correlation between the S/X ratio and kinetic parameters like degradation/production rate constant (K) and maximum productivity rate (μ).

中文翻译：

S/X 比影响乳品废水产酸发酵产生羧酸的概况和动力学

对乳品废水 (DW) 的产酸发酵对羧酸 (CA) 生产的影响进行了评估，研究了底物/微生物 (S/X) 比例的影响，并将不同的数学模型应用于生物产品形成数据。实验在间歇式反应器中进行了 28 天，并测试了四种 S/X 比率（0.8、1.2、1.6 和 1.9 gCOD gVSS）。 S/X比率的增加并不影响DW转化为羧酸的百分比（42-44%），但生产率受到积极影响（一般为100-200%）。乙酸是所有实验中形成的最高浓度的CA，其次是丙酸和丁酸。指数模型更适合描述这一动力学过程。因此，根据估计的动力学参数，S/X比1.6更适合乳制品废水产酸发酵产生CA，其中较长的CA浓度，例如丙酸盐和丁酸盐，形成的量较高。此外，还确定了 S/X 比与降解/生产率常数 (K) 和最大生产率 (μ) 等动力学参数之间的相关性。

更新日期：2021-06-16

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