Fermentative hydrogen and methane cogeneration from cassava residues: Effect of pretreatment on structural characterization and fermentation performance

Jun Cheng, Richen Lin, Lingkan Ding, Wenlu Song, Yuyou Li, Junhu Zhou, Kefa Cen

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The physicochemical properties of cassava residues subjected to microwave (or steam)-heated acid pretreatment (MHAP or SHAP) were comparatively investigated to improve fermentative hydrogen and methane cogeneration. The hydrogen yield from cassava residues with MHAP and enzymolysis was higher (106.2. mL/g TVS) than that with SHAP and enzymolysis (102.1. mL/g TVS), whereas the subsequent methane yields showed opposite results (75.4 and 93.2. mL/g TVS). Total energy conversion efficiency increased to 24.7%. Scanning electron microscopy images revealed MHAP generated numerous regular micropores (~6. μm) and SHAP generated irregular fragments (~23. μm) in the destroyed lignocellulose matrix. Transmission electron microscopy images showed SHAP generated wider cracks (~0.2. μm) in delaminated cell walls than MHAP (~0.1. μm). X-ray diffraction patterns indicated MHAP caused a higher crystallinity index (33.00) than SHAP (25.88), due to the deconstruction of amorphous cellulose. Fourier transform infrared spectroscopy indicated MHAP caused a higher crystallinity coefficient (1.20) than SHAP (1.12).

Original languageEnglish
Pages (from-to)407-413
Number of pages7
JournalBioresource Technology
Volume179
DOIs
Publication statusPublished - 2015 Mar 1

Keywords

  • Cassava residue
  • Hydrogen
  • Methane
  • Microwave-heated acid
  • Steam-heated acid

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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