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<p>Food waste (FW) digestion is often hindered by acidification caused by volatile fatty acid (VFA) accumulation and limited buffering capacity. In contrast, corn industry wastewater (CornWW) offers inherent alkalinity and high buffering potential, enhancing process stability. This study evaluated methane production from mono- and co-digestion of FW and CornWW using batch assays across diverse mixing ratios, followed by reactor performance evaluation in a sequencing batch reactor operated at varying hydraulic retention times (HRTs). In batch experiments, co-digestion improved methane production compared to mono-digestion, with the highest specific methane yield observed at the 40/60 ratio (207.9 ± 6.5 NmL CH<sub>4</sub>/gVS<sub>added</sub>), followed by 30/70 (200.8 ± 3.4 NmL CH<sub>4</sub>/gVS<sub>added</sub>). Although the 10/90 ratio produced a lower specific yield (185.6 ± 6.2 NmL CH<sub>4</sub>/gVS<sub>added</sub>), it demonstrated favorable operational characteristics, including reduced residual VFA concentrations and increased alkalinity. During SBR operation, mono-digestion, the highest methane productivity was 0.23 NL CH<sub>4</sub>/(L·d) at an HRT of 20 d. In contrast, the co-digestion achieved the highest methane productivity of 1.92 NL CH<sub>4</sub>/(L·d) at an HRT of 6 d. This improvement is attributed to the higher content of readily biodegradable organic matter in the mixture and initial pH correction through the addition of sodium bicarbonate at the beginning of the cycle. Microbial analysis revealed that co-digestion sustained higher archaeal abundance and diversity across HRTs, supporting efficient substrate conversion. In contrast, mono-digestion led a decline in methanogens and higher VFA accumulation at shorter HRTs. Additionally, CornWW provided alkalinity and functioned as a substitute for tap water. Overall, co-digestion improved methane productivity, microbial resilience, and system sustainability without requiring substrate pretreatment. These findings highlight the potential of FW/CornWW co-digestion as a robust approach for valorizing complex feedstocks and enhancing methane production across variable HRT conditions.</p>

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Production of methane from corn wastewater and co-digestion with food waste in a sequencing batch reactor varying hydraulic retention time

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月30日

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  • Monserrat Vázquez-López,
  • Marisol Pérez-Rangel,
  • Iván Moreno-Andrade

摘要

Food waste (FW) digestion is often hindered by acidification caused by volatile fatty acid (VFA) accumulation and limited buffering capacity. In contrast, corn industry wastewater (CornWW) offers inherent alkalinity and high buffering potential, enhancing process stability. This study evaluated methane production from mono- and co-digestion of FW and CornWW using batch assays across diverse mixing ratios, followed by reactor performance evaluation in a sequencing batch reactor operated at varying hydraulic retention times (HRTs). In batch experiments, co-digestion improved methane production compared to mono-digestion, with the highest specific methane yield observed at the 40/60 ratio (207.9 ± 6.5 NmL CH4/gVSadded), followed by 30/70 (200.8 ± 3.4 NmL CH4/gVSadded). Although the 10/90 ratio produced a lower specific yield (185.6 ± 6.2 NmL CH4/gVSadded), it demonstrated favorable operational characteristics, including reduced residual VFA concentrations and increased alkalinity. During SBR operation, mono-digestion, the highest methane productivity was 0.23 NL CH4/(L·d) at an HRT of 20 d. In contrast, the co-digestion achieved the highest methane productivity of 1.92 NL CH4/(L·d) at an HRT of 6 d. This improvement is attributed to the higher content of readily biodegradable organic matter in the mixture and initial pH correction through the addition of sodium bicarbonate at the beginning of the cycle. Microbial analysis revealed that co-digestion sustained higher archaeal abundance and diversity across HRTs, supporting efficient substrate conversion. In contrast, mono-digestion led a decline in methanogens and higher VFA accumulation at shorter HRTs. Additionally, CornWW provided alkalinity and functioned as a substitute for tap water. Overall, co-digestion improved methane productivity, microbial resilience, and system sustainability without requiring substrate pretreatment. These findings highlight the potential of FW/CornWW co-digestion as a robust approach for valorizing complex feedstocks and enhancing methane production across variable HRT conditions.