Grease trap waste valorization through hydrothermal liquefaction and anaerobic digestion: a circular approach to dairy wastewater treatment

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dc.contributor.authorCabrera, Daniela V.
dc.contributor.authorAdema-Yusta, Ingrid
dc.contributor.authorSantibanez, Maria J.
dc.contributor.authorCelis, Crispin
dc.contributor.authorTester, Jefferson W.
dc.contributor.authorLabatut, Rodrigo A.
dc.date.accessioned2025-01-20T16:05:18Z
dc.date.available2025-01-20T16:05:18Z
dc.date.issued2024
dc.description.abstractGrease traps are commonly used in the dairy industry to separate fats from their generated wastewater. Due to its properties, grease trap waste (GTW) is predominantly incinerated or landfilled despite its high energy content. In this study, hydrothermal liquefaction (HTL) was used to convert dairy industry GTW into biocrude while the generated HTL-wastewater (AP) was subjected to anaerobic digestion (AD) to recover biomethane. To maximize organic carbon to biocrude conversion, and to minimize the use of freshwater, a fraction of the AP was recirculated in subsequent HTL reactions. AP recirculation increased biocrude yields (73 vs. 78 wt%) but decreased both the higher heating value (HHV) (38 vs. 37 MJ kg-1) and the fraction (72 vs. 64%) of lighter hydrocarbons. Continuous AD using an EGSB reactor proved to be an effective method to further reduce the COD of the AP from 6.5 g L-1 to 0.7 g L-1 and enhance the overall energy recovery of the GTW from 81% (HTL only) to 83.1% (HTL-AD). Integrating HTL with AD and recycling a fraction of the AP in the HTL process allows for efficient wastewater treatment and a recovery of up to 84.8% of the energy contained in the GTW.
dc.description.abstractIntegrating hydrothermal liquefaction (HTL) with anaerobic digestion (AD) and recycling a fraction of the resulting wastewater (AP) in the HTL allows for recovering 85% of the energy contained in the grease waste while reducing its COD to 700 mg L-1.
dc.description.funderFondo Nacional de Desarrollo Cientfico y Tecnolgico
dc.fuente.origenWOS
dc.identifier.doi10.1039/d4ee02245a
dc.identifier.eissn1754-5706
dc.identifier.issn1754-5692
dc.identifier.urihttps://doi.org/10.1039/d4ee02245a
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/89889
dc.identifier.wosidWOS:001339119600001
dc.issue.numero22
dc.language.isoen
dc.pagina.final8941
dc.pagina.inicio8926
dc.revistaEnergy & environmental science
dc.rightsacceso restringido
dc.titleGrease trap waste valorization through hydrothermal liquefaction and anaerobic digestion: a circular approach to dairy wastewater treatment
dc.typeartículo
dc.volumen17
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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