title: Influence of the reactant carbon-hydrogen-oxygen composition on the key products of the direct gasification of dewatered sewage sludge in supercritical water.
abstract: The supercritical water gasification of ten different types of dewatered sewage sludges was investigated to understand the relationship between sludge properties and gasification products. Experiments were performed in a high-pressure autoclave at 400°C for 60 min. Results showed that gasification of sewage sludge in supercritical water consists mainly of a gasification reaction, a carbonization reaction and a persistent organic pollutants synthesis reaction. Changes in the reactant C/H/O composition have significant effects on the key gasification products. Total gas production increased with increasing C/H2O of the reactant. The char/coke content increased with increasing C/H ratio of the reactant. A decrease in the C/O ratio of the reactant led to a reduction in polycyclic aromatic hydrocarbon formation. This means that we can adjust the reactant C/H/O composition by adding carbon-, hydrogen-, and oxygen-containing substances such as coal, algae and H2O2 to optimize hydrogen production and to inhibit an undesired by-product formation.
authors.affiliation: College of Environment, Hohai University, Nanjing 210098, PR China; Department of Earth and Space Science and Engineering, York University, Toronto, Ontario M3J 1P3, Canada.
authors.forename: Miao
authors.initials: M
authors.lastname: Gong
authors.affiliation: College of Environment, Hohai University, Nanjing 210098, PR China; National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, Jiangsu 210098, PR China. Electronic address: zhuweiteam.hhu@gmail.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhu
authors.affiliation: College of Environment, Hohai University, Nanjing 210098, PR China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Fan
authors.affiliation: College of Environment, Hohai University, Nanjing 210098, PR China; National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing, Jiangsu 210098, PR China.
authors.forename: Huiwen
authors.initials: H
authors.lastname: Zhang
authors.affiliation: College of Environment, Hohai University, Nanjing 210098, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Su
mesh_terms: D002244:Carbon / Q000737:chemistry*; D005740:Gases / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry*; D011312:Pressure; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014867:Water
chemical_list: D005740:Gases; D012722:Sewage; D014867:Water; D002244:Carbon; D006859:Hydrogen; D006861:Hydrogen Peroxide; D010100:Oxygen
keywords: C/H/O ratio; Key product; Sewage sludge; Supercritical water gasification