Environmental Engineering Research

Korean Society of Environmental Engineers (대한환경공학회)
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Bio-oil production using residual sewage sludge after lipid and carbohydrate extraction

  • Supaporn, Pansuwan (Department of Biochemical Engineering, Gangneung-Wonju National University) ;
  • Ly, Hoang Vu (Department of Chemical Engineering, Kangwon National University) ;
  • Kim, Seung-Soo (Department of Chemical Engineering, Kangwon National University) ;
  • Yeom, Sung Ho (Department of Biochemical Engineering, Gangneung-Wonju National University)
  • Received : 2017.11.13
  • Accepted : 2018.07.15
  • Published : 2019.12.27
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Abstract

In order to maximize the utilization of sewage sludge, a waste from wastewater treatment facility, the residual sewage sludge generated after lipid and carbohydrate extraction for biodiesel and bioethanol production was used to produce bio-oil by pyrolysis. Thermogravimetric analysis showed that sludge pyrolysis mainly occurred between 200 and $550^{\circ}C$ (with peaks formed around 337.0 and $379.3^{\circ}C$) with the decomposition of the main components (carbohydrate, lipid, and protein). Bio-oil was produced using a micro-tubing reactor, and its yield (wt%, g-bio-oil/g-residual sewage sludge) increased with an increase in the reaction temperature and time. The maximum bio-oil yield of 33.3% was obtained after pyrolysis at $390^{\circ}C$ for 5 min, where the largest amount of energy was introduced into the reactor to break the bonds of organic compounds in the sludge. The main components of bio-oil were found to be trans-2-pentenoic acid and 2-methyl-2-pentenoic acid with the highest selectivity of 28.4% and 12.3%, respectively. The kinetic rate constants indicated that the predominant reaction pathway was sewage sludge to bio-oil ($0.1054min^{-1}$), and subsequently to gas ($0.0541min^{-1}$), rather than the direct conversion of sewage sludge to gas ($0.0318min^{-1}$).

Keywords

References

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