title: Achieving waste to energy through sewage sludge gasification using hot slags: syngas production.
abstract: To relieve the environmental issues of sewage sludge (SS) disposal and greenhouse gas (GHG) emission in China, we proposed an integrated method for the first time to simultaneously deal with these two problems. The hot slags below 920 °C could act as a good heat carrier for sludge gasification and the increasing CO2 concentration in CO2/O2 atmospheres enhanced the production of CO and H2 at 400-800 °C. Three stages of syngas release were clearly identified by Gaussian fittings, i.e., volatile release, char transformation and fixed carbon reaction. Additionally, the effect of sulfur retention of slags and the synergy effect of the stabilization of toxic elements in the solid residuals were discovered in this study. Furthermore, a novel prototype of multiple industrial and urban systems was put forward, in which the produced CO + H2 could be utilized for direct reduced iron (DRI) production and the solid residuals of sludge ash and glassy slags would be applied as cementitious materials. For a steel plant with an annual production of crude steel of 10 million tons in China, the total annual energy saving and GHG emission reduction achieved are 3.31*10(5) tons of standard coal and 1.74*10(6) tons of CO2, respectively.
authors.affiliation: Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, P.R. China.
authors.forename: Yongqi
authors.initials: Y
authors.lastname: Sun
authors.affiliation: URS Corp., PO BOX 1959, Albany, OR 97321, USA.
authors.forename: Jinichiro
authors.initials: J
authors.lastname: Nakano
authors.affiliation: Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, P.R. China.
authors.forename: Lili
authors.initials: L
authors.lastname: Liu
authors.affiliation: 1] Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, P.R. China [2] Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering, Peking University, Beijing 100871, P.R. China.
authors.forename: Xidong
authors.initials: X
authors.lastname: Wang
authors.affiliation: 1] Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, P.R. China [2] Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering, Peking University, Beijing 100871, P.R. China.
authors.forename: Zuotai
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D002244:Carbon / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry; D002248:Carbon Monoxide / Q000737:chemistry; D002681:China; D004736:Energy-Generating Resources; D006801:Humans; D006859:Hydrogen / Q000737:chemistry; D016011:Normal Distribution; D012722:Sewage / Q000737:chemistry*; D013232:Steel / Q000737:chemistry*; D014866:Waste Products / Q000032:analysis*
chemical_list: D012722:Sewage; D014866:Waste Products; D013232:Steel; D002245:Carbon Dioxide; D002244:Carbon; D002248:Carbon Monoxide; D006859:Hydrogen