Sludge is a solid sediment produced in the process of sewage treatment, because it contains heavy metals and other harmful substances, such as improper treatment, it will become a source of urban pollution. Most sludge are disposed by landfill, open-air stacking and outward transportation, and the utilization rate of municipal sludge still needs to be improved. The effective ways of sludge recycling include sludge fuelling, sludge composting granulation and sludge firing construction materials.
The sludge of sewage treatment plant is mixed with sawdust, and the sludge is made into sawdust sludge granules by double roller granulation process, so that sawdust sludge pellets can be used as organic fertilizer or biomass fuel. The burning value of sludge sawdust particles can be increased by the granulation process of double roller fertilizer granulator, which makes the sludge sawdust particles have good formability.
The sludge was composted and feces, straw and other raw materials were added to the fermentation to regulate the moisture content of the sludge fermentation. Adequate oxygen is provided to the material through the trough compost turner machine. After high temperature fermentation, sludge becomes harmless organic material. The fermented and decomposition compost can be used as the organic raw material of the organic fertilizer production line, and is combined with different organic fertilizer production processes to make special fertilizer.
The crushed material is fed into the double roller fertilizer granulator, and the powder is gradually compressed into the arc triangle between the two rolls. When the geometric center line of the opposite roll is reached, the fertilizer in the die hole is subjected to the maximum pressure and compressed into particles. When the roller of the roller granulator continues to rotate through the center line, a slip occurs between the grain and the die hole. Under the action of gravity, the fertilizer particles fall off from the die hole.
