Academic Journal
Solids contents, particle size, and chemical composition as drivers of viscosity in agricultural digestates and separated liquid fractions.
| Τίτλος: | Solids contents, particle size, and chemical composition as drivers of viscosity in agricultural digestates and separated liquid fractions. |
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| Συγγραφείς: | Romio C; Department of Biological and Chemical Engineering, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark. Electronic address: ane.romio@bce.au.dk., Ward AJ; Department of Biological and Chemical Engineering, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark. Electronic address: alastair.ward@bce.au.dk., Møller HB; Department of Biological and Chemical Engineering, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark. Electronic address: henrikb.moller@bce.au.dk. |
| Πηγή: | Bioresource technology [Bioresour Technol] 2026 Dec; Vol. 461, pp. 135491. Date of Electronic Publication: 2026 Jul 22. |
| Τύπος έκδοσης: | Journal Article |
| Γλώσσα: | English |
| Στοιχεία περιοδικού: | Publisher: Elsevier Applied Science Country of Publication: England NLM ID: 9889523 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-2976 (Electronic) Linking ISSN: 09608524 NLM ISO Abbreviation: Bioresour Technol Subsets: MEDLINE |
| Imprint Name(s): | Original Publication: Barking, Essex, England : New York, N.Y. : Elsevier Applied Science ; Elsevier Science Pub. Co., 1991- |
| Ιατρικοί όροι (MeSH): | Manure*/analysis , Particle Size* , Viscosity*, Metals/chemistry ; Rheology ; Animals ; Cattle ; Agriculture |
| Περίληψη: | A comprehensive understanding of digestate viscosity can benefit anaerobic digestion by aiding the selection of pre- or post-treatment methods and supporting the prediction of energy consumption in biogas plants and the impacts of digestate post-processing. Viscosities and chemical composition of 43 full-scale agricultural digestate samples and 12 samples of the liquid fraction of the separated digestate were examined, with eight manure samples included for comparison. The effects of full-scale agricultural digestate separation were evaluated for the first time. Viscosity was described using the power-law model, including the consistency coefficient and flow behaviour index. Shear-thinning behaviour was found in all except three samples. Viscosities of digestates were similar to those of cattle manure, whereas liquid fractions resembled pig manure. Total solids content and content of solids larger than 2 mm correlated (p < 0.001) with the consistency coefficient (r of 0.57 and 0.70) and flow behaviour index (r of -0.56 and -0.69), indicating that the content of solids larger than 2 mm is a better predictor of viscosity. This was further confirmed by substantial viscosity reductions in the liquid fraction of digestate once larger particles were removed, even at inefficient overall total solids removal. Organic components correlated (p < 0.001) positively with the consistency coefficient and negatively with the flow behaviour index; however, they also correlated among themselves and with total solids content, impeding the isolation of effects. Conductivity, pH, density, and some metals did not influence viscosity (p > 0.05), while some other metals did (p < 0.01). (Copyright © 2026 The Authors. Published by Elsevier Ltd.. All rights reserved.) |
| Competing Interests: | Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. |
| Contributed Indexing: | Keywords: Anaerobic digestion; Digestate processing; Rheology; Solid-liquid separation |
| Substance Nomenclature: | 0 (Metals) 0 (Manure) |
| Entry Date(s): | Date Created: 20260722 Date Completed: 20261008 Latest Revision: 20261008 |
| Update Code: | 20261008 |
| DOI: | 10.1016/j.biortech.2026.135491 |
| PMID: | 42486446 |
| Βάση Δεδομένων: | MEDLINE |
| ISSN: | 1873-2976 |
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| DOI: | 10.1016/j.biortech.2026.135491 |