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Type of publication: research article
Type of publication (PDB): Straipsnis konferencijos medžiagoje Clarivate Analytics Web of Science ar/ir Scopus / Article in Clarivate Analytics Web of Science or Scopus DB conference proceedings (P1a)
Field of Science: Ekologija ir aplinkotyra / Ecology and environmental sciences (N012)
Author(s): Paulauskas, Valdas;Zaleckas, Ernestas;Puodžiūnas, Marius
Title: Waste phosphogypsum impact on the mobility of plant macro- and micronutrients in soil amended with sewage sludge
Is part of: Rural development 2011 : 5th international scientific conference, 24-25 November, 2011, Akademija : proceedings. Akademija : Aleksandras Stulginskis University, Vol. 5, b. 1 (2011)
Extent: p. 416-421
Date: 2011
Keywords: Phosphogypsum;Sewage sludge;Nutrient bioavailability;Heavy metal mobility
Abstract: Mobility of primary plant macronutrients - nitrogen (N), phosphorus (P) and potassium (K), secondary macronutrient - magnesium (Mg), as well as micronutrients Zn and Cu, was studied and compared in different sewage sludge, clay soil and cement dust mixtures amended with waste phosphogypsum, as a source of soluble PO4 3-, at dosages of 0.05, 0.1, 0.2 and 0.4g per g of solids. Weak extraction solution approaching the average concentration of many soil solutions - 0.01 M CaCl2 was used as universal extraction solvent suitable for evaluation of soil fertility as well as soil pollution. Electrical conductivity and pH was measured in centrifugates. Phosphogypsum additive reduced electrical conductivity in 0.01 M CaCl2 extracts of sewage sludge and its mixture with soil, while the conductivity of strongly alkaline soil extracts was not affected. Acidifying effect of phosphogypsum on the studied mixtures was negligible due to their high buffering capacity. Phosphate, originating from phosphogypsum, immobilising effect on Zn and Cu was different. Zn treatment efficiency increased together with the increasing pH condition of the system. Meanwhile, Cu leaching from soil-sludge mixtures with 5-40% phosphogypsum additive was reduced by a factor ranging from 37 to 1105. Copper immobilization process was substantially assisted by Cu ion adsorption on soil colloids. Phosphogypsum additive reduced the amount of N-NO3 - in sewage sludge from 4 (5% additive) up to 8 times (40% additive). Phosphogypsum also reduced concentration of 0.01 M CaCl2 extractable K+ in almost all the studied mixtures, but the main reason of such a decrease was low initial concentration of potassium in the additive applied. Meanwhile, addition of phosphogypsum significantly increased concentration of P-PO4 3- in all the studied mixtures with neutral pH.[...]
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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