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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88 Scopus citations


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
StatePublished - Mar 2018

Bibliographical note

Funding Information:
The study was supported by the National Natural Science Foundation of China (Nos. 51668044 , 51768043 , and 21276069 ), the Key Research Development Program of the Jiangxi Province of China (Nos. 20161BBH80029 and 20171BBG70036 ), the Talent Program for Distinguished Young Scholars of Jiangxi Province of China (No. 20171BCB23015 ), and the Key Science and Technology Research Program of Department of Education of the Jiangxi Province of China (No. 150029 ).

Publisher Copyright:
© 2017 Elsevier Ltd


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


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