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Environmental Engineering Research 2019;24(2): 202-210. DOI: https://doi.org/10.4491/eer.2017.178
Bio-oil production using residual sewage sludge after lipid and carbohydrate extraction
Pansuwan Supaporn1, Hoang Vu Ly2, Seung-Soo Kim2, and Sung Ho Yeom1 
1Department of Biochemical Engineering, Gangneung-Wonju National University, Gangneung 25457, Republic of Korea
2Department of Chemical Engineering, Kangwon National University, Samcheok 25913, Republic of Korea
Corresponding Author: Sung Ho Yeom ,Tel: +82-33-640-2406, Fax: +82-33-641-2410, Email: shyeom@gwnu.ac.kr
Received: November 13, 2017;  Accepted: July 15, 2018.
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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°C (with peaks formed around 337.0 and 379.3°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°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 (0.1054 min-1), and subsequently to gas (0.0541 min-1), rather than the direct conversion of sewage sludge to gas (0.0318 min-1).
Keywords: Bio-oil | Kinetic analysis | Micro-tubing reactor | Pyrolysis | Residual sewage sludge | Thermogravimetric analysis
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