This is how PONDUS® TCHP works:
 Thickened waste activated sludge (WAS) is mixed with a small dose of  caustic soda.
 Sludge is heated in a loop through a high-efficiency heat exchanger.
 Sludge is fed into PONDUS® reactor and goes through hydrolysis. After the hydrolysis process, sludge leaves the reactor close to a neutral pH level and the absorbed thermal energy is almost entirely used in the anaerobic digester .
 Thickened primary sludge is mixed with hot hydrolysed sludge achieving an ideal mesophilic temperature and then pumped into the digester .
If needed, additional heat can be provided to the digester through a  heat exchanger.