High-solid anaerobic digestion of corn straw for methane production and pretreatment of bio-briquette

Yeqing Li*, Fang Yan, Tao Li, Ying Zhou, Hao Jiang, Mingyu Qian, Quan Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

In this study, an integrated process was developed to produce methane and high-quality bio-briquette (BB) using corn straw (CS) through high-solid anaerobic digestion (HS-AD). CS was anaerobic digested by using a leach bed reactor at four leachate recirculation strategies. After digesting for 28 days, highest methane yield of 179.6 mL/g-VS, which was corresponded to energy production of 5.55 MJ/kg-CS, was obtained at a higher initial recirculation rate of 32 L-leachate per day. Compared with bio-briquette manufactured from raw CS and lignite, the compressive, immersion and falling strength properties of bio-briquette made from AD-treated CS (solid digestate) and lignite were significantly improved. A preferred BB can be obtained with side compressive strength of 863.8 ± 10.8 N and calorific value of 20.21 MJ/kg-BB. The finding of this study indicated that the integrated process could be an alternative way to produce methane and high-quality BB with CS.

Original languageEnglish
Pages (from-to)741-749
Number of pages9
JournalBioresource Technology
Volume250
DOIs
Publication statusPublished - Feb 2018
Externally publishedYes

Keywords

  • Bio-briquette
  • Corn straw
  • High-solid anaerobic digestion
  • Leach-bed reactor (LBR)
  • Leachate recirculation

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Li, Y., Yan, F., Li, T., Zhou, Y., Jiang, H., Qian, M., & Xu, Q. (2018). High-solid anaerobic digestion of corn straw for methane production and pretreatment of bio-briquette. Bioresource Technology, 250, 741-749. https://doi.org/10.1016/j.biortech.2017.11.083