College of Energy and Environment, Shenyang Aerospace University, The Key Laboratory of Clean Energy in Liaoning Province, Shenyang, China.
College of Energy and Environment, Shenyang Aerospace University, The Key Laboratory of Clean Energy in Liaoning Province, Shenyang, China.
Waste Manag. 2014 Jul;34(7):1211-6. doi: 10.1016/j.wasman.2014.03.022. Epub 2014 May 5.
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.
污水污泥（SS）是废水处理的副产物，由高度浓缩的有机和无机污染物组成，包括磷（P）。本研究采用适当的标准、测量和测试方案，研究了 SS 中不同干燥和烘焙温度下的不同化学形态的 P。SS 的干燥和烘焙处理在实验室规模的炉中进行。通过 31P NMR 光谱分析了在不同处理温度下的两种类型的 SS 样品。这些样品在-50°C 的真空冷冻干燥器和 105°C 的热电恒温干燥箱中进行干燥。结果表明，随着有机 P 含量的减少，无机 P（IP）含量增加，P 的生物有效性增加，因为 IP 是一种可以被植物直接吸收的磷形式。31P NMR 分析结果表明，不同温度下 P 分数的变化。在低温干燥和烘焙下，非磷灰石 P 是 P 的主要形式，而在高温干燥和烘焙下，磷灰石 P 是主要形式。结果表明温度会影响 P 的转化。
