Intensification of heat and mass exchange processes of processing old sludge
DOI:
https://doi.org/10.31548/energiya1(71).2024.054Abstract
At sewage treatment plants, in addition to filtered water, sludge is formed during wastewater treatment. They are dumped on mud sites, which occupy large areas and are almost completely overflowing. The content of a large amount of minerals and toxic substances in sediments leads to the deterioration of the condition of groundwater and soil, which in turn leads to the deterioration of ecology and life. An urgent task in Ukraine is the creation of complex processing of sludge, which includes economic, technological, social and ecological aspects.
The purpose of the research is to intensify the heat and mass exchange processes of processing old sludge deposits with the subsequent creation of a technology for obtaining composite fuel based on them.
The study of drying kinetics of composite granules was carried out on an experimental convective stand with automatic data collection. A comparison of the drying time of composite granules depending on the granulation method was carried out, which showed the expediency of carrying out the process for granules formed on a screw mechanical device. Adsorption studies were carried out, which made it possible to determine the equilibrium moisture content. It was established that the specific heat of combustion of composite granules exceeds the heat of combustion of peat by 1.2 times, which allows them to be used as an alternative fuel.
Key words: old sludge, peat, granules, drying
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