Anaerobic digestion of the rice drying residue in semicontinuous regime

  • Lisbet Mailin López-González Centro de Estudios de Energía y Procesos Industriales. Universidad de Sancti Spíritus “José Martí Pérez”, Sancti Spíritus. Cuba
  • Mildre Zayas-González Departamento de Procesos Agroindustriales, Facultad de Agronomía, Universidad de Ciego de Ávila “Máximo Gómez Báez”. Ciego de Ávila, Cuba
  • Julio Pedraza-Garciga Centro de Estudios de Energía y Procesos Industriales. Universidad de Sancti Spíritus “José Martí Pérez”, Sancti Spíritus. Cuba
Keywords: Anaerobic digestion; anaerobicco digestion; biogas; rice drying residue.


In the present work the anaerobic monodigestion process of rice drying residue (RS) and its codigestion with cattle (RV) and pig (RP) residues in semicontinuoregime was evaluated. The RS was studied on a laboratory scale in a continuous stirred tank reactor (CSTR) in mesophilic regime (37 ºC). The organic loading rate (OLR) was increased from 0, 5 to 3 g VS/Ld in monodigestion, and then kept at 3 g VS/Ld in the codigestion study for the mixture RS96:RV2:RP2, RS94:RV4:RP2 and RS92:RV6:RP2 (based on the % volatile solids in the mixture). The best biogas yield (ybiogas) was obtained during codigestion for the RS92:RV6:RP2 mixture with a value of 705, 48 L/kgVS and a biogas productivity of 2,42 Lbiogas/ Lreactor for a OLR of 3 gVS/Ld. The ybiogas was 28% higher than RS in monodigestion. Results show, an improvement in the AD process of RS by codigestion with RV and RP.


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How to Cite
López-González, L. M., Zayas-González, M., & Pedraza-Garciga, J. (2021). Anaerobic digestion of the rice drying residue in semicontinuous regime. Chemical Technology, 41(1), 141-156. Retrieved from