The invention discloses a preparation method of
sludge biomass fuel, and belongs to the field of fuel preparation. The
biomass fuel disclosed by the invention is prepared by the following steps: putting
sludge into a treating pond, adding a
sodium carbonate solution to mix, planting
elodea nuttallii, and removing the
elodea nuttallii when measuring that the sulphur content is in the required range; carrying out
aeration on the
sludge, standing, taking out for airing, and mixing with wheat straws,
sawdust and rice
bran according to the ratio; repeatedly spraying a
nutrient solution, and then hermetically introducing
oxygen for
fermentation; stopping
fermentation and sealing when measuring that the
nitrogen content is within the required range, and planting amaranthus paniculatus,
vicia villosa and
ciliate desert-grass; and removing plants when heavy
metal content in the fermented product is within the required range, taking out and
drying the plants, and extruding the plants into blocks. The preparation method has the beneficial effects that the sludge is fully utilized to prepare the
biomass fuel; the problems of secondary
pollution of the sludge on the environment, occupation of much land and the like are solved; and sustainable and reasonable utilization of resources can be achieved; and the fuel is safe to use, environment-friendly, high in
combustion heat value and low in consumption.