Abstract
Biological wastewater treatment plants are used to purify water, but they also generate large quantities of sewage sludge and other solid residues. Sewage sludge and the residues on screens have a promising energy content. The article deals with the characterization of two different samples from small wastewater treatment plants, the dewatered sewage sludge and the material remaining on a fine screen after the removal of sand particles and mineral oils. The added value of the waste produced is studied using the torrefaction process. To establish torrefaction, a pilot process was developed in which various waste materials were processed and the effects of different process parameters, such as the influence of different atmospheres and temperatures on the quality of the biofuel, were studied. The raw samples and the solid products of the thermal treatment were analyzed.
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