Our STR exhaust gas dryer for sewage sludge not only fulfils all the demands of the regulations, it also goes far beyond. Due to the special geometry, sewage sludge drying occurs with a level of efficiency not yet achieved on the market.
The dryer uses the pure exhaust gas flow of a CHP and therefore a source of energy, which is otherwise emitted unused into the atmosphere. 50% of the thermal energy of a CHP can be found in the pure exhaust gas flow. With the 550 degrees Celcius (1022 degrees Fahrenheit ) hot exhaust gases, the dryer acheives and evaporation of 600W per liter of water, which is an unparalleled efficiency. Due to the hot air effect, complete sanitization of the dried sewage sludge occurs in the same way as the water, which evaporates. Sewage sludge can also be treated and dried emission free using pure exhaust gas. From a tonne of contaminated sewage sludge, the exhaust gas dryer created 250kg (550lbs) of sanitized biomass, from which the nutrients can be reclaimed and fed back into a circular economy.
Using the gear pelletizer, which was especially developed for sewage sludge, the treatment of dried sewage sludge is dust free and emission free, forming the ideal basis for any subsequent recycling.