Co-liquefaction of sewage sludge and rice straw/wood sawdust: The effect of process parameters on the yields/properties of bio-oil and biochar products

Hua-jun Huang, Yan-chao Chang, Fa-ying Lai, Chun-fei Zhou, Zi-qian Pan, Xiao-feng Xiao, Jia-xin Wang and Chun-huo Zhou

Energy, 2019, vol. 173, issue C, 140-150

Abstract: Liquefaction is a promising technology for the preparation of bio-oil and biochar products from sewage sludge (SS). Co-liquefaction of SS and agricultural/forestry biomass is likely a potential method for obtaining high yield/quality of bio-oil and biochar. In this work, rice straw (RS) and wood sawdust (WS) were selected as representatives of agricultural/forestry biomass and the effects of main process parameters during the co-liquefaction of SS-RS/WS on the yields/properties of bio-oil and biochar were explored in details. The proper reaction temperature, solid-liquid ratio and reaction time for the co-liquefaction of SS-RS/WS were suggested to be 280–300 °C, 0.1 g/mL and 10–30 min, respectively. Potassium/sodium salt (-OH and -CO3) catalysts could efficiently enhanced the co-liquefaction of SS-RS/WS. The introduction of RS/WS into the liquefaction of SS would reduce the contents of nitrogen and sulfur in bio-oil and enhance the formation of phenolic compounds. In addition, co-liquefaction of SS-RS could promote the percentage of lower-boil-point compounds in bio-oil. Although the thermal stability, surface area and pore volume of biochars slightly decreased, the contents of organic matters in biochars were obviously improved, suggesting higher potential in land application.

Keywords: Sewage sludge; Rice straw/wood sawdust; Co-liquefaction; Bio-oil; Biochar (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:173:y:2019:i:c:p:140-150

DOI: 10.1016/j.energy.2019.02.071

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