The production process of bio organic fertilizer is mainly divided into fermentation of organic materials and granulation. The main raw materials are animal manure, domestic waste, dead branches and rotten leaves, biogas residue, waste bacteria, etc. Food processing industry produces a lot of waste, which is a good raw material of organic fertilizer. Here we take distiller’s grains as the main raw material to produce organic fertilizer by high temperature fermentation through organic fertilizer production line.
Sludge, distiller’s grains and composting agent were mixed and composted in different proportions, and went through heating, high temperature and cooling periods. The water content decreased continuously, while the contents of nitrogen, phosphorus, potassium and humic acid increased gradually. The compost material changed from yellow brown to brown, black brown or black. Among them. The ratio of distiller’s grains to sludge was 2:1 (C: n ≈ 25:1). The results showed that 65% of water content and pH 6.5 had the fastest maturity and the best fertilizer quality. It meets the quality standard of organic fertilizer..jpg)
When 50% organic fertilizer and 50% chemical fertilizer are applied together (based on nitrogen), the raw materials can be mixed and granulated by rotary drum granulator in the processing stage. The yield, grain nitrogen content and plant phosphorus and potassium uptake of sorghum were higher than those of chemical fertilizer. The activities of soil available nitrogen, phosphatase, urease and dehydrogenase also increased significantly. Therefore, appropriate amount of sludge and distiller’s grains should be mixed, and microbial agents should be added. The organic fertilizer produced by high temperature fermentation meets the standard. The yield of sorghum, plant nutrition and soil enzyme activity were significantly increased by the application of chemical fertilizer.
In the organic fertilizer and NPK fertilizer manufacturing process, we will encounter various problems, such as the temperature of organic fertilizer fermentation, the construction of organic fertilizer fermentation site, the size requirements of organic fertilizer fermentation tank, and the selection of organic fertilizer fermentation litter. Fermentation is an important link in the processing of organic fertilizers. Only by properly checking can we make high-quality granular fertilizers.