The invention relates to a
sludge treatment process based on a hydrothermal modification technology. The
sludge treatment process is carried out by comprising the following steps of: (1) temporarily storing the
sludge which is subjected to mechanical
dehydration and has the
water content of 70-85% to a pretreatment unit and deodorizing the sludge; (2) introducing to a homogeneous device, fully mixing and homogenizing, introducing the homogenized sludge to a slurrying device, introducing the slurried sludge to a hydrothermal reactor for
hydrothermal reaction, and introducing the hydrothermal sludge to a flash
evaporator for decompression and
flash evaporation; (3) cooling to 35-45 DEG C by using a cooler, then introducing to a high-pressure diaphragm pressure filter for pressure filtering and
dehydration to obtain a dehydrated mud cake with the
solid content of 35-45% and dehydrated filtrate; (4) introducing the dehydrated filtrate to an
intermediate temperature anaerobic reactor, wherein the
residence time is for 5.5-7.5d, the inlet
water temperature is controlled below 40 DEG C, and the
anaerobic reaction temperature is 30-40 DEG C; and (5) preparing a
biomass fuel rod by using the dehydrated mud cake, and introducing the
biomass fuel rod to a boiler to provide steam for the hydrothermal reactor and the flash
evaporator. The sludge treatment process has the advantages of goodtreatment effect, obvious
volume reduction effect, high harmless degree, recycling of
methane, good economic benefit and the like.