SLUDGE DIGESTION TREATMENT SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a sludge digestion treatment system in which a clogging problem of a heat exchanger can be solved and heat energy can be recovered from the digested/withdrawn sludge throughout the whole year.SOLUTION: The sludge digestion treatment system 1, in which thrown sludge W1 is digested anaerobically in a digestion tank 2 and the digested sludge is discharged from the digestion tank 2 through a digested/withdrawn sludge line 10 as digested/withdrawn sludge W2, includes: a first heat exchanger 11 for recovering the heat from the digested/withdrawn sludge W2; a warming heat source 7 for warming the digested sludge in the digestion tank 2 up to the predetermined temperature; a high-temperature water tank 8 for transferring the heat from the warming heat source 7; a second heat exchanger 6 for exchanging the heat with the digested sludge in the digestion tank 2; a low-temperature water tank 9 for recovering a warm water heat medium C1 used for exchanging the heat in the second heat exchanger 6; and a heat pump 12 the low-temperature water heat medium circuit 13 side of which is connected to the first heat exchanger 11. Heat energy is recovered from the digested/withdrawn sludge W2 through a high-temperature water heat medium circuit 14 of the heat pump 12.