Beneficial synergistic effect on bio-oil production from co-liquefaction of sewage sludge and lignocellulosic biomass

Lijian Leng, Jun Li, Xingzhong Yuan, Jingjing Li, Pei Han, Yuchun Hong, Feng Wei, Wenguang Zhou

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44 Scopus citations

Abstract

Co-liquefaction of municipal sewage sludge (MSS) and lignocellulosic biomass such as rice straw or wood sawdust at different mixing ratios and the characterization of the obtained bio-oil and bio-char were investigated. Synergistic effects were found during co-processing of MSS with biomass for production of bio-oil with higher yield and better fuel properties than those from individual feedstock. The co-liquefaction of MSS/rice straw (4/4, wt) increased the bio-oil yield from 22.74% (bio-oil yield from liquefaction of MSS individually) or 23.67% (rice straw) to 32.45%. Comparable increase on bio-oil yield was also observed for MSS/wood sawdust mixtures (2/6, wt). The bio-oils produced from MSS/biomass mixtures were mainly composed of esters and phenols with lower boiling points (degradation temperatures) than those from individual feedstock (identified with higher heavy bio-oil fractions). These synergistic effects were probably resulted from the interactions between the intermittent products of MSS and those of biomass during processing.

Original languageEnglish (US)
Pages (from-to)49-56
Number of pages8
JournalBioresource Technology
Volume251
DOIs
StatePublished - Mar 2018

Keywords

  • Bio-oil
  • Co-liquefaction
  • Lignocellulosic biomass
  • Sewage sludge
  • Synergistic effect

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