Anaerobic Digestion of Olive Mill Wastewater and Process Derivatives—Biomethane Potential, Operation of a Continuous Fixed Bed Digester, and Germination Index

dc.contributor.authorPluschke, Jonas
dc.contributor.authorFaßlrinner, Katharina
dc.contributor.authorHadrich, Fatma
dc.contributor.authorLoukil, Slim
dc.contributor.authorChamkha, Mohamed
dc.contributor.authorGeißen, Sven-Uwe
dc.contributor.authorSayadi, Sami
dc.date.accessioned2023-09-19T09:29:52Z
dc.date.available2023-09-19T09:29:52Z
dc.date.issued2023-08-25
dc.date.updated2023-09-07T11:58:45Z
dc.description.abstractOlive mill wastewater (OMW) management is an economic and environmental challenge for olive oil-producing countries. The recovery of components with high added value, such as antioxidants, is a highly researched approach that could help refinance performant wastewater treatment systems. Anaerobic (co-)digestion is a suitable process to valorize the energetic and nutritional content of OMW and OMW-derived waste streams from resource recovery processes. Issues of process stability, operation, and yields discourage industrial application. Deepening the understanding of biomethane potential, continuous anaerobic digester operational parameters, and co-substrates is key to large-scale implementation. The biomethane potential of different OMW-derived samples and organic solid market waste as co-substrate was 106–350 NL methane per kg volatile solids (VS). The highest yields were obtained with the co-substrate and depolyphenolized OMW mixed with retentate from an ultrafiltration pretreatment. Over 150 days, an anaerobic fixed-bed 300 L digester was operated with different OMW-derived substrates, including OMW with selectively reduced polyphenol concentrations. Different combinations of organic loading rate and hydraulic retention time were set. The biogas yields ranged from 0.97 to 0.99 L of biogas per g of volatile solids (VS) eliminated, with an average methane content in the produced biogas of 64%. Potential inhibition of the process due to high polyphenol concentrations or over-acidification through volatile fatty acids was avoided in the continuous process through process and substrate manipulation. High concentrations of potassium and low concentrations of nitrogen and phosphate end up in the digestate. Sulfate reduction results in high H<sub>2</sub>S concentrations in the biogas. The digestate was tested for phytotoxic properties via the germination index. Diluted digestate samples improved germination by up to 50%.en
dc.description.sponsorshipBMBF, 01DG20005, Verbundprojekt: Innovative Valorisierung von Olivenmühlenabwasser
dc.description.sponsorshipDFG, 512550082, Open-Access-Publikationskosten / 2023-2025 / Technische Universität Berlin
dc.identifier.eissn2076-3417
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/19959
dc.identifier.urihttps://doi.org/10.14279/depositonce-18757
dc.language.isoen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.ddc600 Technik, Medizin, angewandte Wissenschaften::620 Ingenieurwissenschaften::620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
dc.subject.otherolive mill wastewater
dc.subject.otherbiomethane potential
dc.subject.otherfixed bed biogas digester polyphenols
dc.subject.othergermination index
dc.titleAnaerobic Digestion of Olive Mill Wastewater and Process Derivatives—Biomethane Potential, Operation of a Continuous Fixed Bed Digester, and Germination Index
dc.typeArticle
dc.type.versionpublishedVersion
dcterms.bibliographicCitation.articlenumber9613
dcterms.bibliographicCitation.doi10.3390/app13179613
dcterms.bibliographicCitation.issue17
dcterms.bibliographicCitation.journaltitleApplied Sciences
dcterms.bibliographicCitation.originalpublishernameMDPI
dcterms.bibliographicCitation.originalpublisherplaceBasel
dcterms.bibliographicCitation.volume13
dcterms.rightsHolder.referenceCreative-Commons-Lizenz
tub.accessrights.dnbfree
tub.affiliationFak. 3 Prozesswissenschaften::Inst. Technischen Umweltschutz::FG Umweltverfahrenstechnik
tub.publisher.universityorinstitutionTechnische Universität Berlin

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