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The course of the humification process of sewage sludge collected from three biologic–mechanical treatment plants with different treatment technologies was studied. The maturity of sewage sludge and its usefulness for agricultural purposes was also discussed. The physical–chemical properties of humic acids extracted from sewage sludge received from comparable stages of sludge purification were described...
Humic acids, extracted from sludge at the biologic–mechanical sewage treatment plant in Jastrzebie Zdroj, have been investigated by means of 1 H, 13 C and 31 P NMR spectroscopy. Sludge samples for studies were taken from the primary settling tank, the nitrification chamber, the digestion chamber and the sludge drying beds.The 1 H NMR analysis of humic acid extracted...
Humic-like substances (HA) were extracted from sludge from three sewage treatment plants with different treatment technologies. Investigations of the extracted humic-like substances (HA) were carried out by means of elementary analysis and spectroscopic methods. Results of elementary analysis show that the percentage content of nitrogen is different for HA extracted from sludge derived from the...
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