Thermogravimetric and differential thermal analytical investigations on sewage farm soils |
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| Authors: | A. Friedrich K. Grunewald S. Klinnert W. Bechmann |
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| Affiliation: | (1) Institute for Inorganic Chemistry and Didactics of Chemistry, Potsdam University, PBox 60 15 53, 14415 Potsdam, Germany;(2) Institute for Geography and Geoecology, Potsdam University, PBox 60 15 53, 14415 Potsdam, Germany;(3) Institute for Physical and Theoretical Chemistry, Potsdam University, PBox 60 15 53, 14415 Potsdam, Germany |
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| Abstract: | Soil substrates of sewage farms (inflow of sewage areas) and of closed sewage farms were investigated by means of thermogravimetry and differential thermal analysis. The results were compared with those obtained for control samples from outside the sewage farms.The organic matter of actively used sewage areas (inflow) contains a remarkable amount of easily oxidizable compounds brought to the inflows by suspended matter.Beside these compounds, macromolecular organic substances predominate in the composition of the organic matter and are responsible for an immense heat release in the high temperature range of the thermal studies.In the substrates of closed sewage farm inflows or of other sewage farm areas which do not belong to the inflows, the amounts of volatile and easily oxidizable compounds decrease rapidly. The substrates hardly differ in their reaction temperatures from control samples. The influence of single macromolecules on the exothermic oxidation is reduced with increasing humification. |
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| Keywords: | composition DTA organic matter sewage farm soil |
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