Abstract

LOPEZ-GONZALEZ, Lisbet Mailin; ZAYAS-GONZALEZ, Mildre  and  PEDRAZA-GARCIGA, Julio. Anaerobic digestion of the rice drying residue in semicontinuous regime. RTQ [online]. 2021, vol.41, n.1, pp. 141-156.  Epub Mar 28, 2021. ISSN 2224-6185.

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.

Keywords : Anaerobic digestion;anaerobiccodigestion;biogas;rice drying residue.

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