title: Treatment of sewage sludge in supercritical water and evaluation of the combined process of supercritical water gasification and oxidation.
abstract: Influences of temperature and oxidation coefficient (n) on sewage sludge treatment in supercritical water and its corresponding reaction mechanism were studied. Moreover, the combined process of supercritical water gasification (SCWG) and supercritical water oxidation (SCWO) was also investigated. The results show that ammonia nitrogen, phenols and pyridines are main refractory intermediates. The weight of solid products at 873K and n=4 is only 3.5wt.% of the initial weight, which is lower than that after combustion. Volatile organics in solid phase have almost released at 723K and n=0. Highest yield of combustible gases was obtained at n=0, and H2 yield can reach 11.81mol/kg at 873K. Furthermore, the combination of SCWG at 723K and SCWO at 873K with a total n=1 is feasible for its good effluent quality and low operation costs.
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
authors.forename: Lili
authors.initials: L
authors.lastname: Qian
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China. Electronic address: szwang@aliyun.com.
authors.forename: Shuzhong
authors.initials: S
authors.lastname: Wang
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
authors.forename: Donghai
authors.initials: D
authors.lastname: Xu
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
authors.forename: Xingying
authors.initials: X
authors.lastname: Tang
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
authors.forename: Longfei
authors.initials: L
authors.lastname: Wang
mesh_terms: D057919:Biological Oxygen Demand Analysis; D002681:China; D008401:Gas Chromatography-Mass Spectrometry; D007700:Kinetics; D010084:Oxidation-Reduction; D012722:Sewage / Q000737:chemistry*; D014783:Viscosity; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D012722:Sewage; D062065:Wastewater
keywords: Combined process; Economic analysis; Mechanism; Sewage sludge; Supercritical water