Optimization of solid-state anaerobic digestion through the percolate recirculation
| Autor: | Daniela Pezzolla, F. Di Maria, A. Sordi, Giovanni Gigliotti, Luisa Massaccesi, Claudia Zadra |
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| Rok vydání: | 2017 |
| Předmět: |
Chemical substance
020209 energy Digestate 02 engineering and technology 010501 environmental sciences 01 natural sciences Water exctractable organic matter Nutrient 0202 electrical engineering electronic engineering information engineering Waste Management and Disposal Percolate recirculation 0105 earth and related environmental sciences Solid-state anaerobic digestion Animal residues Percolate recirculation Water exctractable organic matter Digestate Total organic carbon Renewable Energy Sustainability and the Environment business.industry Chemistry Solid-state anaerobic digestion Forestry Biodegradable waste Pulp and paper industry Biotechnology Renewable energy Anaerobic digestion Soil water Animal residues business Agronomy and Crop Science |
| Zdroj: | Biomass and Bioenergy. 96:112-118 |
| ISSN: | 0961-9534 |
| DOI: | 10.1016/j.biombioe.2016.11.012 |
| Popis: | Anaerobic digestion is an environmentally sustainable way to manage organic waste, and it is able to enhance the recovery of organic carbon and nutrients in agricultural soils and to produce renewable energy. Solid-state anaerobic digestion (S-SAD) is a technology that permits the treatment of different type of residues, but is characterized by inhibition phenomena, resulting in a low operational stability. An experimental apparatus, equipped with a recirculation system for the digestate liquid fraction (percolate), was used to optimize the S-SAD system. Different frequencies of recirculation, one, two or four per day, were carried out to investigate how recirculation might affect the quality of the liquid fraction as well as the possible effects on biogas production and on the obtained solid digestate quality. Biogas production was positively affected by percolate spreading, especially when recirculation was performed 4 times per day. As shown by percolate chemical analyses, recirculation avoided the accumulation of volatile fatty acids in the liquid fraction, resulting in a better process stability. In addition, recirculation induced a large consumption of readily available compounds in the percolate, as shown by the depletion of water extractable organic C and total reducing sugars. The quality of the digested solid fraction was also improved by percolate recirculation in terms of the C/N ratio and organic N parameters. These findings showed that daily repeated recirculation of the liquid fraction is suitable to avoid inhibition phenomena during S-SAD and to improve the quality of the digestate solid fraction. |
| Databáze: | OpenAIRE |
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