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Improving acid-stressed anaerobic digestion processes with biochar towards a combined biomass and carbon management system

dc.date.accessioned2024-06-28T12:06:04Z
dc.date.available2024-06-28T12:06:04Z
dc.date.issued2024-03-06
dc.identifierdoi:10.17170/kobra-2024062810432
dc.identifier.urihttp://hdl.handle.net/123456789/15887
dc.description.sponsorshipGefördert im Rahmen des Projekts DEAL
dc.description.sponsorshipInterreg NWE Project Three C (NWE1010); Interreg NWE Project RE-DIRECT (NWE294)
dc.language.isoeng
dc.rightsNamensnennung 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectAAEMseng
dc.subjectbuffer capacityeng
dc.subjectcarbon sequestrationeng
dc.subjectgrass-type biomasseng
dc.subjectkinetic rate constantseng
dc.subjectVFA accumulationseng
dc.subject.ddc500
dc.subject.ddc570
dc.titleImproving acid-stressed anaerobic digestion processes with biochar towards a combined biomass and carbon management systemeng
dc.typeAufsatz
dcterms.abstractInterest in biochar as an additive to enhance anaerobic digestion (AD) has grown in the context of biomass cascading use and the 2050 net-zero goal. However, few studies have investigated the effects of biochar on AD from a biochar production perspective, including biomass feedstocks and pyrolysis temperatures. To valorise biomass and better understand the mechanisms and environmental implications of using biochar in AD, this study investigated the effects of distinct biochar types on AD under acid stress-induced process inhibition using batch tests. The results demonstrated that biochar can mitigate acid stress and enhance the methane production rate. The kinetic rate constant of methane production is positively related to the buffer capacity of the tested biochars (R2=0.88). The choice of feedstocks is a crucial factor (P=0.003), particularly the best-performing biochars derived from raw grass silage. In contrast, the pyrolysis temperature effect was less significant (P=0.18). Furthermore, the analysis of biochar indicates that the alkali (K) and alkaline earth (Ca,Mg) metals contained in biochar may be one of the important factors contributing to buffer capacity (R2=0.82 to 0.86). Hence, buffer capacity is a crucial quality criteria when evaluating biochar for AD applications. Raw grass silage biochars are promising for acid stress mitigation due to their high buffer capacity, while carbon-rich woody biochars have highCO2 sequestration potential. A compromise between mitigating acid stress and sequestering carbon is the use of pre-treated grass biochar. Overall, the use of biochar-enriched digestate offers a potential way to close material loops and complete the biomass-to-biochar value chain.eng
dcterms.accessRightsopen access
dcterms.creatorHu, Jiahui
dcterms.creatorWachendorf, Michael
dcterms.creatorGwenzi, Willis
dcterms.creatorJoseph, Ben
dcterms.creatorStenchly, Kathrin
dcterms.creatorKaetzl, Korbinian
dc.relation.doidoi:10.1088/2515-7620/ad2bb7
dc.relation.projectidNWE294
dc.subject.swdBiomasseger
dc.subject.swdPflanzenkohleger
dc.subject.swdGräserger
dc.subject.swdKohlenstoffger
dc.subject.swdPufferkapazitätger
dc.subject.swdSequestrierungger
dc.type.versionpublishedVersion
dcterms.source.identifiereissn:2515-7620
dcterms.source.issueNumber 3
dcterms.source.journalEnvironmental Research Communicationseng
dcterms.source.volumeVolume 6
kup.iskupfalse


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