Two-Stage anaerobic digestion in agroindustrial waste treatment: A review

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 prese...

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Veröffentlicht in:Journal of environmental management 2021-03, Vol.281, p.111854-111854, Article 111854
Hauptverfasser: Cremonez, Paulo André, Teleken, Joel Gustavo, Weiser Meier, Thompson Ricardo, Alves, Helton José
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Teleken, Joel Gustavo
Weiser Meier, Thompson Ricardo
Alves, Helton José
description 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. [Display omitted] •Residues rich in soluble sugars are ideal for two-phase AD.•Two-phase AD ensures higher energy yields.•Two-phase AD provides HRT reduction.•Bio-hythane production from the combination of CH4 and H2.•System combination depends on the wastes properties.
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subjects Anaerobiosis
Biofuels - analysis
Biohythane
Bioreactors
Dark fermentation
Energy recovery
Food
Hydrogen production
Methane
Refuse Disposal
Sewage
Waste management
title Two-Stage anaerobic digestion in agroindustrial waste treatment: A review
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