| Autor: |
Gianluigi Farru, Giovanna Cappai, Alessandra Carucci, Giorgia De Gioannis, Fabiano Asunis, Stefano Milia, Aldo Muntoni, Matteo Perra, Angela Serpe |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Science of The Total Environment. 846:157464 |
| ISSN: |
0048-9697 |
| DOI: |
10.1016/j.scitotenv.2022.157464 |
| Popis: |
The agro-industrial sector makes a high contribution to greenhouse gas emissions; therefore, proper waste management is crucial to reduce the carbon footprint of the food chain. Hydrothermal carbonization (HTC) is a promising and flexible thermochemical process for converting organic materials into energy and added-value products that can be used in different applications. In this work, grape marc residues before and after an extraction process for recovering polyphenols were hydrothermally treated at 220 °C for 1 h. The resulting hydrochar and process water were investigated to test an innovative cascade approach aimed at a multiple product and energy recovery based on the integration of HTC with anaerobic digestion. The results show that this biorefinery approach applied to grape marc could allow to diversify and integrate its potential valorisation options. The produced hydrochars possess an increased fixed carbon content compared to the feedstock (up to +70 %) and, therefore, can be used in soil, immobilizing carbon in a stable form and partially replacing peat in growing media (up to 5 % in case of hydrochar from grape marc after extraction), saving the consumption of this natural substrate. In addition, energy can be recovered from both hydrochar by combustion and from process water through anaerobic digestion to produce biogas. Hydrochars show good properties as solid fuel similar to lignite, with an energy content of around 27 MJ kg |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect