title: Characterization of bio-oil and biochar from high-temperature pyrolysis of sewage sludge.
abstract: The influence of temperature (550-850°C) on the characteristics of bio-oil and biochar from the pyrolysis of sewage sludge (SS) in a horizontal tube reactor was investigated. Results showed that when the pyrolysis temperature increased from 550°C to 850°C, the yield of bio-oil decreased from 26.16% (dry ash-free basis) to 20.78% (dry ash-free basis). Main components of bio-oil were phenols, esters, cholests, ketones, amides, indoles, and nitriles. Besides, the elevated heating rate of 25°C/min was demonstrated to favour the complete combustion of bio-oil. Moreover, caused by the increase in temperature, the yield of biochar decreased from 54.9 to 50.6 wt%, Brunauer-Emmet-Teller surface area increased from 48.51 to 81.28 m2/g. Furthermore, pH was increased from 5.93 of SS to 7.15-8.96 of biochar. The negative ζ-potential was also strengthened (-13.87 to -11.30 mV) and principal functional groups on the surface of biochar were -OH, C=O, C=C, -NO2, and S=O.
authors.affiliation: a College of Environmental Science and Engineering , Hunan University , Changsha 410082 , People's Republic of China.
authors.forename: Hongmei
authors.initials: H
authors.lastname: Chen
authors.forename: Yunbo
authors.initials: Y
authors.lastname: Zhai
authors.forename: Bibo
authors.initials: B
authors.lastname: Xu
authors.forename: Bobin
authors.initials: B
authors.lastname: Xiang
authors.forename: Lu
authors.initials: L
authors.lastname: Zhu
authors.forename: Lei
authors.initials: L
authors.lastname: Qiu
authors.forename: Xiaoting
authors.initials: X
authors.lastname: Liu
authors.forename: Caiting
authors.initials: C
authors.lastname: Li
authors.forename: Guangming
authors.initials: G
authors.lastname: Zeng
mesh_terms: D056804:Biofuels; D002606:Charcoal / Q000737:chemistry*; D006361:Heating / Q000379:methods*; D017745:Incineration / Q000379:methods*; D008422:Materials Testing; D059205:Renewable Energy; D012722:Sewage / Q000737:chemistry*; D013696:Temperature
chemical_list: D056804:Biofuels; D012722:Sewage; C540010:biochar; D002606:Charcoal
keywords: bio-oil; biochar; combustion characteristic; pyrolysis; sewage sludge