The invention discloses a
resource utilization method of
sludge based on
thermal hydrolysis-
pyrolysis carbonization. The method includes the steps of: (1) transporting dehydrated
sludge to a
sludge preheater; (2) sending the preheated sludge into a sludge
thermal hydrolysis reaction kettle; (3) subjecting the
thermal hydrolysis product to
solid-liquid separation to obtain thermal
hydrolysis filtrate and a
solid product; (4) carrying out natural heap
drying, crushing, activation and
granulation on the
solid product successively, then conveying the product to a rotary controllable
pyrolysis carbonization furnace by a spiral conveyer, and conducting high-temperature rapid
pyrolysis to obtain
biochar,
tar and high-temperature
waste gas, introducing the high-temperature
waste gas into the sludge preheater, and subjecting the
biochar to resource comprehensive utilization; and (5) subjecting the thermal
hydrolysis filtrate to anaerobic
fermentation, and using the generated
biogas as the fuelof the pyrolysis
carbonization furnace. The method provided by the invention overcomes the problems of
high energy consumption of the sludge carbonization process and nonstandard resource utilizationmethod of sludge
biochar in
sewage treatment plants at present, and realizes reduction, stabilization, harmless and resource comprehensive utilization of sludge in
sewage treatment plants.