Two-stage versus single-stage anaerobic co-digestion on methane synthesis: Energy prospects and microbial community

Author(s)

Devens, Kauanna Uyara ; Ribeiro, Alexandre Rodrigues ; Camargo, Franciele Pereira ; Sakamoto, Isabel Kimiko ; Varesche, Maria Bernadete Amancio ; Silva, Edson Luiz

• Document type: Journal article
• Source: PROCESS SAFETY AND ENVIRONMENTAL PROTECTION; v. 196, p. 13-pg., 2025-02-14.

Abstract

Cassava processing wastewater (CW), a byproduct generated during cassava processing activities, and glycerol (Gly), a byproduct of biodiesel production processes, have a high concentration of organic matter and digestibility, which provides them with great potential for hydrogen (H2) and methane (CH4) generation. This study evaluated the co-digestion of cassava wastewater and glycerol in a single-stage versus two-stage process using a fluidized bed reactor (AFBR), i.e., a mesophilic acidogenic reactor (MAR) + a sequential mesophilic reactor (SMR) and a mesophilic methanogenic reactor (MMR), operated at mesophilic temperature (30 degrees C). Thus, the effect of increasing the organic matter concentration of 1-12.5 g [chemical oxygen demand] COD.L-1 (50 %:50 % on a COD basis) on CH4 production was verified. Co-digestion consistently yielded methane production in both single and two-stage processes. The two-stage process stood out as the single stage, providing a maximum CH4 Yield (MY) of 341.10 mL CH4. gCOD-cons1 and CH4 production rate (MPR) of 168.23 mL of CH4.L-1. h-1, respectively. Regarding the microbial community, the methanogens Methanobacterium and Methanobrevibacter prevailed. Moreover, the two-stage and single-stage presented energy potentials of 161.23 kJ.d-1 and 54.26 kJ.d-1, in that order. Upon comparative analysis of the performance between two-stage and single-stage methanogenic reactors, it becomes apparent that the co-digestion of CW and Gly in a two-stage configuration exhibited enhancements over the single-stage. (AU)

• FAPESP's process: 22/10615-1 - Consolidation of the biorefinery concept applied to the biological treatment of wastewater and solid wastes
• Grantee: Marcelo Zaiat
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 15/06246-7 - Biorefinery concept applied to biological wastewater treatment plants: environmental pollution control coupled with material and energy recovery
• Grantee: Marcelo Zaiat
• Support Opportunities: Research Projects - Thematic Grants