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Waste Management & Research
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Nutrients and heavy metals distribution in thermally treated pig manure

Ksawery Kuligowski

Environmental Engineering Section, Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, 9000 Aalborg, Denmark, ksaw{at}bio.aau.dk

Tjalfe G. Poulsen

Environmental Engineering Section, Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, 9000 Aalborg, Denmark

Peder Stoholm

Danish Fluid Bed Technology ApS, 4000 Roskilde, Denmark

Niels Pind

Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark

Jens Laursen

Department of Natural Sciences, Faculty of Life Sciences, University of Copenhagen, 1871 Frederiksberg C, Denmark

Ash from pig manure treated by combustion and thermal gasification was characterized and compared in terms of nutrient, i.e., potassium (K), phosphorus (P) and heavy metal, i.e., cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni) and zinc (Zn) contents. Total nutrient and metal concentrations were measured using energy dispersive X-ray fluorescence analysis. Acid (HNO3, H2SO4) and water-extractable concentrations were also measured both in non-classified ash and in selected ash particle size fractions using flame atomic absorption spectrometry and colorimetric spectrometry. Results indicate that ash from gasified manure contained more water-extractable K in comparison with combusted manure whereas the opposite was the case with respect to P. Heavy metals Ni, Cr and Cd were present in higher concentrations in the fine particle size fractions (< 30 µm of particle diameter), whereas K, P, Zn and Cu exhibited higher concentrations in the coarser particle size fractions (> 30 µm).

Key Words: Animal manure ash • thermal gasification • incineration • nutrients • heavy metals • particle size distribution • wmr 1309—5

Waste Management & Research, Vol. 26, No. 4, 347-354 (2008)
DOI: 10.1177/0734242X08090075
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