Sewage Sludge Drying with WP
Recovery of heat from clarified wastewater provides several advantages: Considerable heat potentials are available due to the huge water volumes, effluent cooling does not have negative effects on the receiving water, and sewage treatment plants often have a high demand for heat.
Our compact, self-cleaning RoWin Heat Exchanger is preferably installed as tank version in a depression in the effluent channel.
The recovered heat can for example be used to enhance sludge drying in our Solar Dryer SRT.
Solar dryers use free solar energy. Sometimes, however, when there is not enough sun for seasonal or climate reasons, there is not sufficient solar energy available.
To reduce space requirements in such cases and/or ensure all-year-round drying, it is reasonable to use an additional regenerative heat source: wastewater heat!
A regenerative heat source can be the heat contained within wastewater. The temperature level of wastewater heat is rather moderate, but the heat is permanently available on each sewage treatment plant. We use a heat pump to raise the temperature up to a level that enables the reliable and efficient use of this thermal energy for low-temperature sludge drying.
The heat pump generates 4 to 6 kWh useful heat.