title: Transformation of phosphorus during drying and roasting of sewage sludge.
abstract: Sewage sludge (SS), a by-product of wastewater treatment, consists of highly concentrated organic and inorganic pollutants, including phosphorus (P). In this study, P with different chemical fractions in SS under different drying and roasting temperatures was investigated with the use of appropriate standards, measurements, and testing protocol. The drying and roasting treatment of SS was conducted in a laboratory-scale furnace. Two types of SS samples under different treatment temperatures were analyzed by (31)P NMR spectroscopy. These samples were dried by a vacuum freeze dryer at -50°C and a thermoelectric thermostat drying box at 105°C. Results show that the inorganic P (IP) content increased as the organic P content decreased, and the bio-availability of P increased because IP is a form of phosphorousthat can be directly absorbed by plants. (31)P NMR analysis results indicate the change in P fractions at different temperatures. Non-apatite P was the dominant form of P under low-temperature drying and roasting, whereas apatite P was the major one under high-temperature drying and roasting. Results indicate that temperature affects the transformation of P.
authors.affiliation: College of Energy and Environment, Shenyang Aerospace University, The Key Laboratory of Clean Energy in Liaoning Province, Shenyang, China. Electronic address: rdlee@163.com.
authors.forename: Rundong
authors.initials: R
authors.lastname: Li
authors.affiliation: College of Energy and Environment, Shenyang Aerospace University, The Key Laboratory of Clean Energy in Liaoning Province, Shenyang, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yin
authors.affiliation: College of Energy and Environment, Shenyang Aerospace University, The Key Laboratory of Clean Energy in Liaoning Province, Shenyang, China.
authors.forename: Weiyun
authors.initials: W
authors.lastname: Wang
authors.affiliation: College of Energy and Environment, Shenyang Aerospace University, The Key Laboratory of Clean Energy in Liaoning Province, Shenyang, China.
authors.forename: Yanlong
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Energy and Environment, Shenyang Aerospace University, The Key Laboratory of Clean Energy in Liaoning Province, Shenyang, China.
authors.forename: Ziheng
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D003890:Desiccation; D006358:Hot Temperature; D009682:Magnetic Resonance Spectroscopy; D010758:Phosphorus / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage; D010758:Phosphorus
keywords: (31)P NMR; Drying and roasting; Phosphorus; Sewage sludge; Transformation