About

About DDI HEAT EXCHANGERS INC. DDI HEAT EXCHANGERS since 1980. DIRECT SLUDGE TO SLUDGE HEAT RECOVERY Patented RECTANGULAR Channels The only system in the world that takes Hot Digested Sludge Energy, Moves it Directly to the Cold Raw Sludge. Even 26% solids for both liquids. ROI less then 1 year. In FARMS, Municipalities WWTP or Industrial. Over 60 Installations. Can clean inside within minutes. Never got plugged. No door no Gaskets required. Also GREY WATER recovery from large Hotels. And from the underground City Sewage pipes. Both can be used to preheat the water in the boiler building.