Skip to Main content Skip to Navigation
Journal articles

Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions

Abstract : 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, SUVA254, an indicator for aromatic molecule content and the stabilization of organic matter, was associated with the hydraulic retention time (HRT).
Document type :
Journal articles
Complete list of metadata

https://hal.inrae.fr/hal-03148211
Contributor : Dominique Fournier <>
Submitted on : Monday, February 22, 2021 - 8:53:04 AM
Last modification on : Tuesday, March 30, 2021 - 2:40:14 PM

File

Akhiar-Energies-2021-CC-BY.pdf
Files produced by the author(s)

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Citation

Afifi Akhiar, Felipe Guilayn, Michel Torrijos, Audrey Battimelli, Abd Halim Shamsuddin, et al.. Correlations between the Composition of Liquid Fraction of Full-Scale Digestates and Process Conditions. Energies, MDPI, 2021, 14 (4), pp.971. ⟨10.3390/en14040971⟩. ⟨hal-03148211⟩

Share

Metrics

Record views

51

Files downloads

52