Sludge drying : a case study

The sludge drying process for biological wastewater treatment is the most widespread wastewater treatment process in the world. The by-product of this process sludge is generally a problematic issue, and there is no simple solution. The article focuses on the sludge drying issue. Different aspects of the drying process are brought up. Starting with a question if sludge drying is really a necessity, through discussing the results of sludge drying, the process of sludge drying, types of dryers, sludge dryer localization, suitable range of sludge drying, energy consumption and costs of sludge drying, and finally pointing out some problems connected with sludge drying application