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vol. 4, nr. 3 (2004)
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Changes in the content of soluble forms of iron, manganese and humus compounds in composted and vermicomposted sewage sludge
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Krzysztof Gondek, Barbara Filipek-Mazur
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Department of Agricultural Chemistry, University of Agriculture, Al. Mickiewicza 21, 31-120 Kraków |
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vol. 4 (2004), nr. 3,
pp. 677-686
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abstract:
Addition of various components to composting caused a dilution of iron and man-ganese content. As a result of vermicomposting, total iron concentration increased. The proportion of this element extracted with water and CaCl2 in total iron content was small, both in composts and vermicomposts. Composting caused a decrease in the content of manganese extracted with water and CaCl2 (in comparison with untreated sludge), whereas vermicomposting increased this content. Analysis of fractional composition of humus compounds in the studied materials revealed successively diminishing humic acid fraction (as sludge processing proceeded) and a growth in fulvic acid fraction. Proportion of non-hydrolyzing carbon in the total carbon content did not exceed 80% (and 68% in farmyard manure).
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keywords:
sewage sludge, compost, vermicompost, iron, manganese, humus compounds
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original in:
Polish
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