A Study on the Feasibility of Anaerobic Co-Digestion of Raw Cheese Whey with Coffee Pulp Residues

Energies

Juan M. Perez-Morales¹  Laura Acosta-Domínguez¹  Sandra Gonzalez-Piedra¹  Eliseo Hernandez-Martinez¹  Héctor Hernández-García²  Juan-Rodrigo Bastidas-Oyanedel³ 

[1] Facultad de Ciencias Químicas, Universidad Veracruzana, Xalapa Veracruz 91000, Mexico;Instituto Tecnológico Superior de Xalapa, Xalapa Veracruz 91096, Mexico;SDU-IGT, SDU-Biotechnology, Department of Green Technology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark;

关键词: anaerobic co-digestion;    raw cheese whey;    coffee pulp;    experimental design;    kinetic model;   

DOI  :  10.3390/en14123611

来源: DOAJ

【 摘 要 】

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 35 °C (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 mL_CH4 g_VSrem⁻¹ (31.5% VS removed) for raw cheese whey and coffee pulp ratio of 1 g_VSwhey g_VSCoffe⁻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.

【 授权许可】

Unknown