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NaOH-urea pretreatment enhanced H2 and CH4 yields via optimizing mixed alkali ratio, pretreatment time, and organic loading rate during anaerobic digestion of corn stover

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  • Sha, Hao
  • Wang, Qing
  • Dong, Zheng
  • Cao, Shengxian
  • Zhao, Bo
  • Wang, Gong
  • Duan, Jie

Abstract

This work studied the impact of NaOH-urea pretreatment on corn stover for H2 and CH4 production through two-stage anaerobic digestion. Results showed that the NaOH-urea pretreatment process improved CH4 production more significantly compared to H2. Optimized by Box-Behnken design (BBD) experiments, the CH4 cumulative yield was increased by 34.2 % at NaOH: urea = 3.2: 26.8, time = 15.7 min, and organic loading rate (OLR) = 23.4 w/v. Microbial community diversity analysis showed that the hydrogen and methane production stages formed communities dominated by Bacteroidales and Methanobacteriales, respectively. In addition, NaOH-urea pretreatment enhanced the metabolite energy recovery efficiency by 28.5–40.9 %. Finally, the return on investment (ROI) of the NaOH-urea pretreatment process reached 26.1 % with significant economic benefits. This research proposed a chemical pretreatment process for anaerobic digestion of corn stover by optimizing the pretreatment conditions of NaOH- urea.

Suggested Citation

  • Sha, Hao & Wang, Qing & Dong, Zheng & Cao, Shengxian & Zhao, Bo & Wang, Gong & Duan, Jie, 2024. "NaOH-urea pretreatment enhanced H2 and CH4 yields via optimizing mixed alkali ratio, pretreatment time, and organic loading rate during anaerobic digestion of corn stover," Energy, Elsevier, vol. 288(C).
    • Handle: RePEc:eee:energy:v:288:y:2024:i:c:s0360544223029894
    DOI: 10.1016/j.energy.2023.129595
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