The share of zinc in fractions is not constant and changes under the influence of different factors. Taking it into consideration relevant studies were conducted. Their aim was to explain the influence of time factor and addition of calcium oxide into the sewage sludge on the quantitative changes of zinc in particular chemical fractions of sludge. The experiment was carried out in incubation conditions in time of six months.
Agricultural University of Poznan, Wojska Polskiego 71F, 60-625 Poznan, Poland
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