Sludge organic fertilizer production process
Let's look at the sludge organic fertilizer production process:
1. Adjust raw material moisture:
The sludge in the water treatment plant is generally high in water content, about 75% - 80%. Generally, it has been anaerobic fermented, and the content of harmful bacteria is not high. When it is transported back to the fermentation plant, the raw materials with low water content shall be laid under the fermentation tank, and then the water absorbing auxiliary materials shall be laid on the top, so that the liquid organic fertilizer can be fully utilized, which can increase the various nutrients in the raw materials, and the materials in the fermentation The water content of is 50% - 55%.
Add water absorbing auxiliary materials to sludge, such as domestic garbage, crushed crop straw, branches, leaves and sludge fertilizer with low moisture content after backfilling fermentation: general sludge accounts for 60% - 70%, domestic garbage and other water absorbing auxiliary materials account for about 30% - 40%.
2. Add sludge starter:
Adding a sludge starter to the sludge is generally added before fermentation. Through the functions of flipping organic fertilizer machine, flipping and stirring, the fermentation bacteria are evenly mixed with the sludge. The adding amount of the composite fermentation bacteria is generally 0.1% - 0.3% about. As long as the sludge fermentation agent is applied to the sludge.
3. Rump fermentation:
High temperature fermentation can effectively kill pathogenic microorganisms and Ascaris eggs in the sludge, fix heavy metals in the microbial body, or become insoluble carbonate, and prevent heavy metals from entering the food chain. When the temperature reaches 65-70 ?, the reactor can be turned over and cooled. If the temperature is too high during fermentation, the beneficial bacteria in the raw materials will be killed. When the content of the beneficial bacteria in the finished product is not up to the standard, it can be fermented to 5-7 days in summer, 12-15 days in winter, and placed in the storage plant for stacking fermentation. The time is 3-5 days, and the granulation can be carried out when the water content is 35% - 40%.
Generally, there are two kinds of fermentation methods: the ground strip fermentation by the ground compost windrow turner and the trough dumping fermentation by the trough dumper. The sludge organic fertilizer production process introduced in this paper uses a tank type fermentation tossing machine.
4. Material crushing:
Because the fermented material contains small agglomerates, which is not conducive to the granulation of the finished product, the material can be crushed at this time, which can be carried out by the organic fertilizer crusher with the number of 1-2 sets of power of 30KW × 2.
5. Material mixing:
The crushed materials are transported to the batching bin, and then to the main conveyor through automatic batching, and then to the mixer for mixing.
6. Material granulation:
Small and medium-sized organic fertilizer plants generally use organic fertilizer granulator to granulate, which can save investment cost, and the pelletizing rate is also high, which can reach more than 93%. There are three kinds of particles: large, medium and small. The angle of the granulating plate must be adjusted to a certain position. The angle depends on the size of the particles. The larger the angle is, the smaller the particles are, the smaller the angle is, and the larger the particles are.
7. Drying and cooling process of organic fertilizer:
The granulated semi-finished organic fertilizer particles are sent to the dryer by the main conveyor for drying, and the drying temperature is controlled below 70 degrees. Because the water content of the feed is about 35% - 40%, the high temperature will kill the beneficial bacteria in the raw materials. The retention time of the particles in the dryer is 40-45 minutes, and the rotation speed of the dryer is Four point five - 5 turns to the discharge port.
The dried organic fertilizer finished particles are sent to the primary screening machine through the conveyor to separate large, medium and small particles. The larger particles are sent to the crusher for crushing and re granulation through the return belt. The medium and finished materials are sent to the cooler for cooling through the conveyor. Because the particles have a certain temperature, the particles are sent to the cooler after cooling, and the fine powder is sorted out through the two screening.
8. Packaging of finished products
The screened organic fertilizer finished particles are sent to the organic fertilizer automatic packaging machine through the conveyor, and then the final bio organic fertilizer can be produced by measuring packaging.