Civil and industrial sludge drying plants: quality and savings
The dehydration process using drying systems allows to reduce the weight of the sludge according to the initial and final humidity. In most cases, the sludge has an initial humidity level of 75% and must therefore be centrifuged or belt-pressed. Reducing the humidity to 15% results in a weight loss of 70%. This means that from 1000 kg / of wet sludge, 300 kg of dry sludge remains. If we consider that the average disposal cost is around € 200 / ton, with industrial dryers for civil and industrial sludge disposal costs are reduced by 70%.
For drying, hot air or natural gas is used, if there is no heat available to recover. Also in this case, despite the price of gas, the disposal of sludge would allow a cost reduction of 50%, which would even reach 70% if there was the possibility of recovering thermal waste on site.