The invention discloses a complete steam low-temperature thermally hardening,
tempering and
drying device for
sludge and a method for treating
sludge and belongs to the field of
solid wastes. The
system comprises a
sludge storing and conveying
system, a low-temperature thermally hardening and
tempering device, a plate frame filter-pressing and
dewatering system, a
pelletizing and air-
drying system, a
waste gas treating system, a deodorizing system, a waste water treating system and a steam supply system, wherein the sludge storing and conveying system is used for ensuring the temperature safety, environment-friendly storage and transportation of the sludge; the low-temperature thermally hardening and
tempering device is used for damaging the outer wall structures of
solid-phase substances such as cells and the like in the sludge and improving the
dewatering performance of the sludge; the plate frame filter-pressing and
dewatering system is used for dewatering the thermally hardened and tempered sludge; the
pelletizing and air-
drying system is used for
pelletizing and naturally drying
dewatered sludge; the
waste gas treating system is used for collecting waste steam produced by the low-temperature thermally hardening and tempering device; the deodorizing system is used for treating
odor produced by the system; the waste water treating system is used for treating drained liquid produced by plate frame filter-pressing treatment; and the steam supply system is used for supplying saturated steam to the low-temperature thermally hardening and tempering device. Therefore, the aims of drying the sludge, reducing
energy consumption, lowering cost and providing favorable conditions for subsequent resource recycling of the sludge are fulfilled.