Using Central Composite Design to Improve Methane Production from Anaerobic Digestion of Tomato Plant Waste

Graciela M. L. Ruiz-Aguilar, Juan H. Martínez-Martínez, Rogelio Costilla-Salazar and Sarai Camarena-Martínez ()
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Graciela M. L. Ruiz-Aguilar: Departamento de Ciencias Ambientales, División Ciencias de la Vida, Campus Irapuato-Salamanca, Universidad de Guanajuato, Irapuato 36500, Mexico
Juan H. Martínez-Martínez: Departamento de Ingeniería en Energías Renovables, Tecnológico Nacional de México/ITS de Abasolo, Abasolo 36976, Mexico
Rogelio Costilla-Salazar: Departamento de Ciencias Ambientales, División Ciencias de la Vida, Campus Irapuato-Salamanca, Universidad de Guanajuato, Irapuato 36500, Mexico
Sarai Camarena-Martínez: Departamento de Ciencias Ambientales, División Ciencias de la Vida, Campus Irapuato-Salamanca, Universidad de Guanajuato, Irapuato 36500, Mexico

Energies, 2023, vol. 16, issue 14, 1-15

Abstract: Tomato plant waste (TPW) is a significant agricultural byproduct that has been often underutilized. Recent studies have shown that its use to obtain methane in an anaerobic digestion (AD) process is viable. However, there is not much information available on studies to improve methane production from this substrate using statistical methods for optimization processes such as central composite design (CCD). For this investigation, CCD was adopted to analyze the effect of S/I ratio (substrate/inoculum ratio) (0.32–1.12), temperature (27–43 °C), and inoculum concentration (10.35–20.95 g VS/L) on methane generation and volatile solids (VS) removal in a batch AD system mono-digestion of TPW. The highest average value of methane yield was found to be 210.8 mL CH 4 /g VS (S/I ratio 0.48, 40 °C, and 18.80 g VS/L), and the highest average value of VS removal was found to be 36.9% (S/I ratio 1.12, 35 °C, and 15.65 g VS/L). We obtain a model with a better fit for the VS removal (R 2 = 0.9587) than for the methane production (R 2 = 0.9156). Temperature and S/I ratio were the factors most important for methane production and VS removal, respectively.

Keywords: methane production; central composite design; agriculture waste; tomato plant; anaerobic mono-digestion; substrate-to-inoculum ratio; volatile solids removal (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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