The production of excess sewage sludge is a major challenge for the waste management industry. Despite the decreasing social acceptance of the implementation of thermal treatment methods, excess sewage sludge is still subject to such processes. These thermal methods seem to be the most optimal solution due to the possibility of a significant reduction of generated sewage sludge volume, as well as a high degree of utilization of potentially harmful organic fractions. Nevertheless, the fact that the processes are conducted at temperatures of around 850 ° C does not give absolute certainty of neutralizing the whole range of potentially harmful organic substances. Some non-thermo-labile substances, such as polychlorinated biphenyls (PCBs) or furans, may not be completely neutralized during sewage sludge combustion processes. These compounds can adsorb on the surface of ashes, or more often dusts, during the thermal utilization of sludge, which consequently are introduced into the environment as a result of their secondary use or storage. The determination of Furans or compounds from the PBC group is not a standard analytical procedure implemented to control the quality of ashes or dust before being stored or even recycled. There are a number of publications under which substances from the PCB group are determined in raw sewage sludge. However, not many literature reports have been found regarding the determination of the above-mentioned organic substances in solid residues after the thermal utilization of processed sludge. It is worth emphasizing that these compounds are considered to be highly harmful and environmentally hazardous. Proposing a new method of determination of the mentioned pollutants in ashes and dust after thermal utilization of sewage sludge seems to be an issue worth considering both in an analytical and environmental point of view. Continuing the research may inspire to search for further funding opportunities in the future.
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