López-López Alberto, León-Becerril Elizabeth, Rosales-Contreras María Elena, Villegas-García Edgardo
a Department of Environmental Technology , Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco , A.C., Av. Normalistas 800, Colinas de la Normal, 44270 Guadalajara , Jalisco , Mexico.
Environ Technol. 2015;36(19):2468-76. doi: 10.1080/09593330.2015.1034790. Epub 2015 Apr 27.
The main problem linked to the stability of upflow anaerobic sludge blanket (UASB) reactors during the treatment of Tequila vinasse is the high acidity and the null alkalinity present in this effluent. This research evaluates the effect of alkalinity and volatile fatty acids (VFAs) concentration on the performance of an UASB reactor with recirculation of the effluent for removing organic matter and biogas production from Tequila vinasses. Recirculation of the effluent reduces the impact of VFAs and organic matter concentration present in the influent, inducing the stability of the reactor. The UASB reactor was operated during 235 days at organic loading rates from 2.5 to 20.0 kg m(-3) d(-1), attaining a removal efficiency of COD greater than 75% with a methane yield of 335 ml CH4 g(-1) COD at SPT, maintaining a ratio of VFAs/Alk ≤ 0.5. Therefore, an optimal ratio of VFAs/Alk was established for the system operating in stable conditions for the treatment of Tequila vinasses. Under these conditions, the alkalinity was recuperated by the system itself, without the addition of external alkalinity.
在处理龙舌兰酒糟的过程中，与上流式厌氧污泥床（UASB）反应器稳定性相关的主要问题是该废水呈现的高酸度和零碱度。本研究评估了碱度和挥发性脂肪酸（VFA）浓度对具有废水循环功能的UASB反应器性能的影响，该反应器用于从龙舌兰酒糟中去除有机物并生产沼气。废水循环减少了进水VFA和有机物浓度的影响，从而提高了反应器的稳定性。UASB反应器在有机负荷率为2.5至20.0 kg m(-3) d(-1)的条件下运行了235天，在标准温度和压力下，COD去除效率大于75%，甲烷产率为335 ml CH4 g(-1) COD，保持VFA/碱度≤0.5的比例。因此，确定了在稳定条件下处理龙舌兰酒糟的系统的VFA/碱度最佳比例。在这些条件下，系统自身恢复了碱度，无需添加外部碱度。
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