Spectroscopic Investigation in the Mid- and Far-Infrared Regions of Phosphorus Fertilizers Derived from Thermochemically Treated Sewage Sludge Ash

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Abstract:

Inorganic phosphorus and nitrogen–phosphorus–potassium (NPK) fertilizers based on phosphates from thermochemically treated sewage sludge ash were analyzed using mid-infrared (mid-IR) and far-infrared (FIR) spectroscopy. The different compounds present in the fertilizers were qualitatively determined with the help of recorded reference spectra of pure substances. Differentiation between various phosphates and other compounds such as sulfates, nitrates, and oxides was possible using combined interpretation of the mid-IR and FIR spectra. The results are in agreement with previous X-ray diffraction (XRD) measurements of the same samples. The main phosphate phases detected were NH4H2PO4, MgHPO4·3H2O, Mg3(PO4)2, Ca5(PO4)5Cl, CaHPO4·2H2O, Ca(H2−PO4)2·H2O, and AlPO4. Furthermore, K2SO4, NH4NO3, Fe2O3, and SiO2 were identified in the IR spectra. However, ammonium and sulfate compounds were only identified in the mid-IR region but were not detectable in the FIR region.

Keywords: FAR-INFRARED SPECTROSCOPY; FERTILIZER; MID-INFRARED SPECTROSCOPY; P-FERTILIZER; PHOSPHORUS COMPOUNDS; SEWAGE SLUDGE ASH

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/10-06168

Affiliations: 1: BAM Federal Institute for Materials Research and Testing, Division IV.3 Waste Treatment and Remedial Engineering, Unter den Eichen 87, D-12205 Berlin, Germany 2: BAM Federal Institute for Materials Research and Testing, Division I.4 Process Analytical Technology, Unter den Eichen 87, D-12205 Berlin, Germany

Publication date: March 1, 2011

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