First of all: in order to make organic fertilizer from dairy manure compost, the problem of high moisture content of cow manure should be solved, so the water content of cow manure should be reduced first. The cost of using a single harmless sewage treatment equipment is high, the technical difficulty is great, and the treatment capacity is small (the cycle in the fermentation tank is long, and the old one has entered the fermentation tank before the new one comes out). So we can add some auxiliary materials with low water content (wheat straw, corn straw, rice straw, rice husk powder, peanut seedling powder, furfural residue, bean cake, etc.) to the dairy manure. On the one hand, these auxiliary materials can reduce the water content of cattle manure, on the other hand, they can also increase the organic matter content after fermentation composting. Straw, husk bran, cake, dregs and other materials are crushed by straw crusher. After the crusher is even, straw and other auxiliary materials are mixed with cow dung urine in the proportion of 3:1 (high moisture content) or 1:1 (low moisture content) to start fermentation.
Secondly, in the process of fermentation, it is necessary to constantly turn over the pile to promote the oxygen to enter into the pile, to prevent the poor air circulation and the production of ammonia gas, so as to generate a large number of unpleasant smell. Therefore, several thermometers can be inserted into the fermentation pile to observe and measure the composting temperature of Dairy manure at any time. When the temperature of cattle manure fermentation pile rises to more than 50 ℃, the windrow turner (or tank turning machine) shall be used for pile turning, and the pile shall be turned once every 2-3 days to ensure that the temperature of the pile does not exceed 60 ℃.
When the temperature of the reactor decreased slowly and kept between 30-40℃, the fermentation stage began to enter the post decomposition stage. At this time, stop turning the pile and wait for the self decomposition of fermentation materials. This stage will take about 7-10 days. After fermentation, compost can be made into powder by crusher, or special fertilizer products can be made by fertilizer granulator machine, mixer, drum dryer and other equipment, so as to improve the appearance quality of organic fertilizer.