The invention discloses a carbon-based compound
fertilizer and
biomass gas co-production technology based on municipal
sludge. The technology comprises the following steps: 1)
dehydration; 2) crushing; 3) mixing: 53%-92% by
mass of
sludge particles, 1%-40% by
mass of
straw powder and 3%-8% by
mass of a
carbon sequestration additive are mixed, wherein the
carbon sequestration additive contains diatomite,
calcium oxide and
magnesium ore
powder; 4)
drying; 5)
granulation; 6)
pyrolysis and gasification:
biomass derived fuel particles are fed into a gasifier and subjected to
pyrolysis and gasification under the micro-
oxygen condition of air equivalent ratio being 0.18-0.25 at 600-800 DEG C,
biomass mixed fuel containing part of purities is obtained, and carbon residues in the gasifier are discharged; 7)
gas separation: wood
tar and wood vinegar are removed from the biomass
mixed fuel through purification, and the purified biomass
mixed fuel is taken as gas fuel; 8), carbon-based compound
fertilizer preparation: 40%-60% of the carbon residues, 12%-20% of a wood
tar and wood vinegar mixed liquid, 20%-35% of
inorganic nitrogen phosphorus and
potassium fertilizer and 2%-5% of diatomite are mixed.
Biomass in the municipal
sludge and residues obtained after
energy conservation treatment can be used efficiently, by means of the obtained compound fertilizer, soil
granulation can be increased, the rate of utilization of the fertilizer by crops is increased, heavy
metal components are solidified, secondary
pollution to the environment is avoided, few resources are consumed, and the comprehensive
economic benefits are increased.