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

Leng, Lijian, Li, Jun, Yuan, Xingzhong, Li, Jingjing, Han, Pei, Hong, Yuchun, Wei, Feng, Zhou, Wenguang
Bioresource technology 2018 v.251 pp. 49-56
biochar, biofuels, biomass, boiling point, esters, feedstocks, lignocellulose, liquefaction, mixing, phenols, rice straw, sawdust, sewage sludge, synergism, temperature, wood
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.