Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions
Fast development of centralized agricultural biogas plants leads to high amounts of digestate production. The treatment and disposal of liquid fractions after on-site digestate solid–liquid separation remains problematic due to their high organic, nutrient and aromatic contents. This work aims to st...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-02-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/4/971 |
| _version_ | 1797396812371329024 |
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| author | Afifi Akhiar Felipe Guilayn Michel Torrijos Audrey Battimelli Abd Halim Shamsuddin Hélène Carrère |
| author_facet | Afifi Akhiar Felipe Guilayn Michel Torrijos Audrey Battimelli Abd Halim Shamsuddin Hélène Carrère |
| author_sort | Afifi Akhiar |
| collection | DOAJ |
| description | Fast development of centralized agricultural biogas plants leads to high amounts of digestate production. The treatment and disposal of liquid fractions after on-site digestate solid–liquid separation remains problematic due to their high organic, nutrient and aromatic contents. This work aims to study the variability of the remaining compounds in the digestate liquid fractions in relation to substrate origin, process parameters and solid–liquid separation techniques. Twenty-nine digestates from full-scale codigestion biogas plants and one waste activated sludge (WAS) digestate were collected and characterized. This study highlighted the combined effect of the solid–liquid separation process and the anaerobic digestion feedstock on the characteristics of liquid fractions of digestates. Two major clusters were found: (1) liquid fractions from high efficiency separation process equipment (e.g., centrifuge and others with addition of coagulant, flocculent or polymer) and (2) liquid fractions from low efficiency separation processes (e.g., screw press, vibrating screen and rotary drum), in this latter case, the concentration of chemical oxygen demand (COD) was associated with the proportion of cow manure and energy crops at biogas plant input. Finally, SUVA<sub>254</sub>, an indicator for aromatic molecule content and the stabilization of organic matter, was associated with the hydraulic retention time (HRT). |
| first_indexed | 2024-03-09T00:56:57Z |
| format | Article |
| id | doaj.art-c65c0597117a46c0b2b7cd03fd5b080f |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T00:56:57Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-c65c0597117a46c0b2b7cd03fd5b080f2023-12-11T16:52:41ZengMDPI AGEnergies1996-10732021-02-0114497110.3390/en14040971Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process ConditionsAfifi Akhiar0Felipe Guilayn1Michel Torrijos2Audrey Battimelli3Abd Halim Shamsuddin4Hélène Carrère5INRAE, Université de Montpellier, LBE, 102 Avenue des Etangs, 11100 Narbonne, FranceINRAE, Université de Montpellier, LBE, 102 Avenue des Etangs, 11100 Narbonne, FranceINRAE, Université de Montpellier, LBE, 102 Avenue des Etangs, 11100 Narbonne, FranceINRAE, Université de Montpellier, LBE, 102 Avenue des Etangs, 11100 Narbonne, FranceInstitute of Sustainable Energy (ISE), Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang 43000, Selangor, MalaysiaINRAE, Université de Montpellier, LBE, 102 Avenue des Etangs, 11100 Narbonne, FranceFast development of centralized agricultural biogas plants leads to high amounts of digestate production. The treatment and disposal of liquid fractions after on-site digestate solid–liquid separation remains problematic due to their high organic, nutrient and aromatic contents. This work aims to study the variability of the remaining compounds in the digestate liquid fractions in relation to substrate origin, process parameters and solid–liquid separation techniques. Twenty-nine digestates from full-scale codigestion biogas plants and one waste activated sludge (WAS) digestate were collected and characterized. This study highlighted the combined effect of the solid–liquid separation process and the anaerobic digestion feedstock on the characteristics of liquid fractions of digestates. Two major clusters were found: (1) liquid fractions from high efficiency separation process equipment (e.g., centrifuge and others with addition of coagulant, flocculent or polymer) and (2) liquid fractions from low efficiency separation processes (e.g., screw press, vibrating screen and rotary drum), in this latter case, the concentration of chemical oxygen demand (COD) was associated with the proportion of cow manure and energy crops at biogas plant input. Finally, SUVA<sub>254</sub>, an indicator for aromatic molecule content and the stabilization of organic matter, was associated with the hydraulic retention time (HRT).https://www.mdpi.com/1996-1073/14/4/971anaerobic digestionsolid wasteorganic compoundsolid–liquid separationliquid phasedigestate treatment |
| spellingShingle | Afifi Akhiar Felipe Guilayn Michel Torrijos Audrey Battimelli Abd Halim Shamsuddin Hélène Carrère Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions Energies anaerobic digestion solid waste organic compound solid–liquid separation liquid phase digestate treatment |
| title | Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions |
| title_full | Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions |
| title_fullStr | Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions |
| title_full_unstemmed | Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions |
| title_short | Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions |
| title_sort | correlations between the composition of liquid fraction of full scale digestates and process conditions |
| topic | anaerobic digestion solid waste organic compound solid–liquid separation liquid phase digestate treatment |
| url | https://www.mdpi.com/1996-1073/14/4/971 |
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