Modelisation of the Biomethane Accumulation in Anaerobic Co-Digestion of Whey and Sugarcane Molasse Mixtures

Author:

Arotingo Guandinango Huaita Pacari1,Espín Valladares Rosario del Carmen2,Núñez Pérez Jimmy2ORCID,Lara Fiallos Marco Vinicio2,Pereda Reyes Ileana3,Pais-Chanfrau José Manuel2ORCID

Affiliation:

1. Comunidad Santa Bárbara, Cotacachi 100350, Ecuador

2. Carrera de Agroindustria, FICAYA, Universidad Técnica del Norte, Ave. 17 de julio 5-21 y Gral. José Ma. De Córdova, Ibarra 100105, Ecuador

3. Process Engineering Centre (CIPRO), Universidad Tecnológica de La Habana “José Antonio Echeverría”, Marianao 19390, Cuba

Abstract

The biomethane accumulation of several combinations of whey and sugarcane molasses, inoculated with sludge from a treatment facility of one of the dairy enterprises of the Imbabura province in Ecuador, was assessed in the current experiment at a constant COD0/VSin ratio of 0.5. The whey/molasses (W:M) ratios for each treatment were (in % (m/m)) 0:100, 25:75, 50:50, 75:25, and 100:0, with a constant temperature of 37 °C and an initial pH adjustment of 7.5. Half a litre of total mixes was used for each treatment in duplicate. Six kinetic models were evaluated to account biomethane accumulation in anaerobic co-digestion processes in batch of whey and sugarcane molasses. Five of these have been tested by other researchers, and one was developed by modifying a first-order model to consider changes in the biomethane accumulation profile. This proposed model, along with the modified two-phase Gompertz model, resulted in the ones that were best able to adjust the experimental data, obtaining in all cases an R2 ≥ 0.949, indicating the accuracy of both models. In addition, the proposed here model has five parameters, one less than the modified two-phase Gompertz model, making it more straightforward and robust.

Publisher

MDPI AG

Subject

Plant Science,Biochemistry, Genetics and Molecular Biology (miscellaneous),Food Science

Reference29 articles.

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3. Milk whey-from a problematic byproduct to a source of valuable products;Prensa Med. Argent,2017

4. Sector Azucarero del Ecuador;Vayas;Obs. Econ. Soc. Tunguragua,2018

5. Experimental investigation on the production of biogas from waste food;Alghoul;Energy Sources Part A Recover. Util. Environ. Eff.,2019

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