title: Enhanced humification by carbonated basic oxygen furnace steel slag--II. Process characterization and the role of inorganic components in the formation of humic-like substances.
abstract: Enhanced humification by abiotic catalysts is a potentially promising supplementary composting method for stabilizing organic carbon from biowastes. In this study, the role of steel slag in the transformation of humic precursors was directly characterized by measuring the variance in dissolved organic carbon (DOC), spectroscopic parameters (E(600)), and the concentration and molecular weight change of humic-like substances (HLS) during the process. In addition, a mechanistic study of the process was explored. The results directly showed that steel slag greatly accelerated the formation of HLS. The findings indicate that Fe(III)-and Mn(IV)-oxides in steel slag act as oxidants and substantially enhance the polycondensation of humic precursors. Moreover, the reaction appears to suppress the release of metals from steel slag to a certain extent under acidic conditions. This can be attributed to the cover of HLS on the external surface of steel slag, which is significant for its environmentally sound reuse.
authors.affiliation: Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University, Beijing 100084, China.
authors.forename: Guangxia
authors.initials: G
authors.lastname: Qi
authors.forename: Dongbei
authors.initials: D
authors.lastname: Yue
authors.forename: Masami
authors.initials: M
authors.lastname: Fukushima
authors.forename: Shigeki
authors.initials: S
authors.lastname: Fukuchi
authors.forename: Ryo
authors.initials: R
authors.lastname: Nishimoto
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Nie
mesh_terms: D002244:Carbon / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis*; D017745:Incineration / Q000379:methods*; D007220:Industrial Waste / Q000517:prevention & control*; D007287:Inorganic Chemicals / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D013232:Steel / Q000737:chemistry*
chemical_list: D006812:Humic Substances; D007220:Industrial Waste; D007287:Inorganic Chemicals; D013232:Steel; D002244:Carbon; D010100:Oxygen