A study on the feasibility of anaerobic co-digestion of raw cheese whey with coffee pulp residues

Sandra Gonzalez-Piedra, Héctor Hernández-García, Juan M. Perez-Morales, Laura Acosta-Domínguez, Juan Rodrigo Bastidas-Oyanedel*, Eliseo Hernandez-Martinez*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

In this paper, a study on the feasibility of the treatment of raw cheese whey by anaerobic co-digestion using coffee pulp residues as a co-substrate is presented. It considers raw whey generated in artisanal cheese markers, which is generally not treated, thus causing environmental pollution problems. An experimental design was carried out evaluating the effect of pH and the substrate ratio on methane production at 35C (i.e., mesophilic conditions). The interaction of the parameters on the co-substrate degradation and the methane production was analyzed using a response surface analysis. Furthermore, two kinetic models were proposed (first order and modified Gompertz models) to determine the dynamic profiles of methane yield. The results show that co-digestion of the raw whey is favored at pH = 6, reaching a maximum yield of 71.54 mLCH4 gVSrem−1 (31.5% VS removed) for raw cheese whey and coffee pulp ratio of 1 gVSwhey gVSCoffe−1 . The proposed kinetic models successfully fit the experimental methane production data, the Gompertz model being the one that showed the best fit. Then, the results show that anaerobic co-digestion can be used to reduce the environmental impact of raw whey. Likewise, the methane obtained can be integrated into the cheese production process, which could contribute to reducing the cost per energy consumption.

Original languageEnglish
Article number3611
JournalEnergies
Volume14
Issue number12
Number of pages11
ISSN1996-1073
DOIs
Publication statusPublished - 17. Jun 2021

Keywords

  • Anaerobic co-digestion
  • Coffee pulp
  • Experimental design
  • Kinetic model
  • Raw cheese whey

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