title: Partial oxidation of landfill leachate in supercritical water: Optimization by response surface methodology.
abstract: To achieve the maximum H2 yield (GYH2), TOC removal rate (TRE) and carbon recovery rate (CR), response surface methodology was applied to optimize the process parameters for supercritical water partial oxidation (SWPO) of landfill leachate in a batch reactor. Quadratic polynomial models for GYH2, CR and TRE were established with Box-Behnken design. GYH2, CR and TRE reached up to 14.32mmol·gTOC(-1), 82.54% and 94.56% under optimum conditions, respectively. TRE was invariably above 91.87%. In contrast, TC removal rate (TR) only changed from 8.76% to 32.98%. Furthermore, carbonate and bicarbonate were the most abundant carbonaceous substances in product, whereas CO2 and H2 were the most abundant gaseous products. As a product of nitrogen-containing organics, NH3 has an important effect on gas composition. The carbon balance cannot be reached duo to the formation of tar and char. CR increased with the increase of temperature and oxidation coefficient.
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
authors.forename: Yanmeng
authors.initials: Y
authors.lastname: Gong
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
authors.forename: Shuzhong
authors.initials: S
authors.lastname: Wang
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
authors.forename: Haidong
authors.initials: H
authors.lastname: Xu
authors.affiliation: Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, 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, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
authors.forename: Xingying
authors.initials: X
authors.lastname: Tang
mesh_terms: D000641:Ammonia / Q000032:analysis; D002245:Carbon Dioxide / Q000032:analysis; D002254:Carbonates / Q000737:chemistry; D002681:China; D006859:Hydrogen / Q000737:chemistry; D008962:Models, Theoretical; D009584:Nitrogen / Q000032:analysis; D010084:Oxidation-Reduction; D013696:Temperature; D014867:Water; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002254:Carbonates; D014874:Water Pollutants, Chemical; D014867:Water; D002245:Carbon Dioxide; D000641:Ammonia; D006859:Hydrogen; D009584:Nitrogen
keywords: Landfill leachate; Partial oxidation; Response surface methodology; Supercritical water