| 摘要 |
<p>In sewage sludge treatment in the context of recycling, in which the sewage sludge, in sequential treatment stages, is first dried (T), then converted (K) under anaerobic conditions at approximately 250 to 350 degrees C and is finally sintered (S) at at least 1250 degrees C, it is proposed to carry out all process steps, including transport of the goods to be treated between the individual treatment stages, in a continuous flow sequence in a closed system. Only the vapours from the drying stage (T) and the conversion gas from the conversion stage (K) are taken off from this system and condensed; the heat contained in the flue gas arising during sintering (S) is used for heating, firstly in the conversion stage (K) and then in the drying stage (T). By using the flue gases for heating the treatment stages in the sequence of the naturally occurring temperature drop, the sewage sludge treatment is almost self-contained from the energy consumption point of view, that is the energy required for the treatment is largely obtained from the calorific value of the organic components contained in the sewage sludge itself. Treating the sewage sludge in a closed system avoids adverse effects on the environment. …<IMAGE>… </p> |
