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Solid-liquid separation of digestate from biogas plants: A systematic review of the techniques’ performance
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Biogas Solutions Research Center.ORCID-id: 0000-0003-0091-3646
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik. Linköpings universitet, Tekniska fakulteten. Linköpings universitet, Biogas Solutions Research Center.ORCID-id: 0000-0002-0722-6083
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Linköpings universitet, Biogas Solutions Research Center. Institute of Marine Science, Federal University of Sao Paolo, Santos, Brazil.ORCID-id: 0000-0003-3561-0936
2024 (engelsk)Inngår i: Journal of Environmental Management, ISSN 0301-4797, E-ISSN 1095-8630, Vol. 356, artikkel-id 120585Artikkel, forskningsoversikt (Fagfellevurdert) Published
Abstract [en]

Digestate processing is a strategy to improve the management of digestate from biogas plants. Solid-liquid separation is usually the primary step and can be followed by advanced treatments of the fractions. The knowledge about the performance of the separators and the quality of the fractions is scattered because of many available techniques and large variability in digestate characteristics. We performed a systematic review and found 175 observations of full-scale solid-liquid separation of digestate. We identified 4 separator groups, 4 digestate classes based on substrate, and distinguished whether chemical conditioners were used. We confirmed the hypothesis that the dominant substrate can affect the efficiency of the digestate separation. Furthermore, the results showed that centrifuges separated significantly more dry matter and total P than screw presses. Use of chemical conditioners in combination with a centrifuge lowered the dry matter concentration in the liquid fraction by 30%. Screw presses consumed 4.5 times less energy than centrifuges and delivered 3.3 tonne ammonium N in the liquid fraction and 0.3 tonne total P in the solid fraction using 1 MWh. The results can provide data for systems analyses of biogas solutions and can support practitioners when choosing among full-scale separator techniques depending on the digestate type. In a broader perspective, this work contributes to the continuous improvement of biogas plants operations and to their role as nutrients recovery sites.

sted, utgiver, år, opplag, sider
Elsevier, 2024. Vol. 356, artikkel-id 120585
Emneord [en]
Anaerobic digestion; Chemical conditioners; Digestate processing; Full-scale performance; Nutrients recovery; Solid-liquid separation.
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Identifikatorer
URN: urn:nbn:se:liu:diva-201788DOI: 10.1016/j.jenvman.2024.120585ISI: 001219411800001PubMedID: 38508011OAI: oai:DiVA.org:liu-201788DiVA, id: diva2:1846245
Forskningsfinansiär
Swedish Energy Agency, 35624-2Swedish Energy Agency, 35624-3Swedish Research Council Formas, 2021-02429Swedish Energy Agency, P2023-00827
Merknad

Funding Agencies|Biogas Research Center (BRC); Swedish Energy Agency [35624-2, 35624-3, P2023-00827]; Link oping University; Swedish University of Agricultural Sciences; Formas [2021-02429]

Tilgjengelig fra: 2024-03-21 Laget: 2024-03-21 Sist oppdatert: 2024-05-31bibliografisk kontrollert

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Carraro, GiacomoTonderski, KarinEnrich Prast, Alex

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