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The paper reports how preliminary thermal conditioning of sewage sludge at 70 °C for 6, 12 and 24 hours affected the changes of physical and chemical properties of the sludge and concentration of 16 EPA-PAHs. Thermal condi-tioning of sewage sludge improved hydrolysis, brought about an increase in acidity and content of volatile fatty acids as well as a decrease in pH; in the sludge conditioned for...
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