Federal University of Paraná (UFPR-Campus Palotina), 2153 Pioneiro St., Bairro Jardim Dallas, Palotina, PR, 85.950-000, Brazil.
Federal University of Paraná (UFPR-Campus Palotina), 2153 Pioneiro St., Bairro Jardim Dallas, Palotina, PR, 85.950-000, Brazil.
J Environ Manage. 2021 Mar 1;281:111854. doi: 10.1016/j.jenvman.2020.111854. Epub 2020 Dec 25.
The anaerobic digestion is a process widely recognized as an interesting alternative for the treatment and stabilization of residual organic substrates. However, several technical limitations were observed based on the characteristics of the organic matter submitted to the process, such as the presence of high concentrations of soluble sugars or fats. The technology of anaerobic digestion in multiple stages is described as a viable option in the control of variables, optimizing the environmental conditions of the main microorganisms involved in the process, assuring high solid removal and methane production, besides allowing a higher energy yield through the generation of molecular fuel hydrogen. Several studies reviewed the process of anaerobic digestion in multiple stages in the treatment of food waste, although few report its use applied directly to agroindustrial residues. Thus, the present work aims to review the literature evaluating the scenario and viability of the multi-stage anaerobic digestion process applied to agroindustrial effluents. Effluents such as manipueira, vinasse, and dairy wastewater are substrates that present high yields when treated by AD processes with stage separation. The high concentration of easily fermentable sugars results in a high production of molecular hydrogen (co-product of the production of volatile acids in the acid phase) and methane (methanogenic phase). The great challenges related to the development of the sector are focused on the stability of the composition and yield of hydrogen in the acid phase, besides the problems resulting from the treatment of complex residues. Thus, the present study suggests that future works should focus on the technologies of new microorganisms and optimization of process parameters, providing maturation and scale-up of the two-stage anaerobic digestion technique.
厌氧消化是一种被广泛认可的处理和稳定有机剩余物的有趣方法。然而，基于提交给该过程的有机物的特性，如存在高浓度的可溶性糖或脂肪，观察到了一些技术限制。多阶段厌氧消化技术被描述为控制变量的可行选择，优化了参与该过程的主要微生物的环境条件，确保了高固体去除率和甲烷产量，并通过生成分子燃料氢气来实现更高的能量产量。有几项研究综述了多阶段厌氧消化在处理食品废物方面的应用，尽管很少有报道直接将其应用于农业工业残留物。因此，本工作旨在综述评价多阶段厌氧消化工艺应用于农业工业废水的现状和可行性的文献。在有阶段分离的 AD 处理中，一些废水，如 manipueira、vinasse 和乳制品废水，作为底物具有较高的产率。高浓度的易发酵糖导致大量的分子氢（酸相产生挥发性酸的副产物）和甲烷（产甲烷相）产生。该领域发展的主要挑战集中在酸相组成和氢气产量的稳定性上，以及处理复杂残留物所带来的问题。因此，本研究建议未来的工作应侧重于新型微生物技术和工艺参数的优化，为两相厌氧消化技术的成熟和扩大提供支持。
