WASTEWATER SLUDGE TREATMENT SYSTEM

The invention is a wastewater sludge treatment system comprising: - a pre-dryer (10) comprising a first sludge space (10A) receiving a sludge to be pre- dried and a first heating space (10B), wherein the first sludge space (10A) is connected to a first sludge conduit (A1) adapted for introducing the sludge to be pre-dried and to a second sludge conduit (A2) adapted for carrying off pre-dried sludge, the first sludge space (10A) being also connected to a first air inlet conduit (D1 ) adapted for introducing drying air and to a first air outlet conduit (E1) adapted for discharging the drying air, and wherein the first heating space (10B) is connected to a first flue gas inlet conduit (B1) adapted for introducing flue gas and to a first flue gas outlet conduit (C1) adapted for discharging the flue gas, - a post-dryer (11) comprising a second sludge space (11A) receiving a sludge to be post-dried and a second heating space (11B), wherein the second sludge space (11A) is connected to a third sludge conduit (A3) adapted for introducing the sludge to be post-dried and to a fourth sludge conduit (A4) adapted for carrying off post-dried sludge, the second sludge space (10B) being also connected to a second air inlet conduit (D2) adapted for introducing drying air and to a second air outlet conduit (E2) adapted for discharging the drying air, and wherein the second heating space (11B) is connected to a second flue gas inlet conduit (B2) adapted for introducing flue gas and a second flue gas outlet conduit (C2) adapted for discharging the flue gas, - a furnace (13), wherein the fourth sludge conduit (A4) is introduced into a combustion chamber (14) thereof. The system is characterised by - further comprising a diffuser (12) arranged between the pre-dryer (10) and the post- dryer (1 1), wherein the diffuser (12) is connected to the first sludge space (10A) via the second sludge conduit (A2) and to the second sludge space (1 1A) via the third sludge conduit (A3), and wherein the diffuser (12) is connected to a third air inlet conduit (D3) adapted for introducing drying air and to a third air outlet conduit (E3) adapted for discharging the drying air, and - the first air outlet conduit (E1) and the third air outlet conduit (E3) are introduced into the combustion chamber (14) of the furnace (13). La présente invention concerne un système de traitement de boues d'eaux usées comprenant : - un pré-sécheur (10) comprenant un premier espace de boue (10A) recevant une boue des