Method for preparing biomass fuel by taking cow dung as raw material

Abstract

The invention discloses a method for preparing a biomass fuel by taking the cow dung as the raw material, comprising the following steps: (1) treating the fresh cow dung until the water content is decreased to 60-75%; (2) mixing the fresh cow dung with a composite microbial inoculum, and fermenting for 10-20 days until the water content of the product of fermentation is less than 42%; and (3) feeding the product of fermentation into a granulating workshop, grinding, screening, granulating, and airing until water content is less than 30% to obtain the biomass fuel. The stickiness of cow dung is made to decrease by the biological activity of the microbial inoculum so that the solid and the liquid are separated naturally, the COD concentration of the sewage separated out is reduced significantly compared with that of the cow dung liquid mechanically squeezed out and is generally about 500mg/l, and the sewage can enter a sewage treating system of the pasture so as to be treated without generating impact load. The temperature of the cow dunghill rises ceaselessly to about 70 DEG C at most so that various harmful microorganisms in the cow dung can be killed effectively. The content of crude fiber in the product of fermentation enriches gradually, and the calorific value increases correspondingly to more than 2,500kcal.

Description

technical field [0001] The invention relates to the field of biomass fuels, in particular to a method for preparing biomass fuels from cow dung. Background technique [0002] After a lot of investigation and understanding of the treatment of dairy cow manure at home and abroad, at present, Japan mainly solves the problem of cow manure by controlling the scale of pastures, drying cow manure on the spot, and making flower fertilizer, but the investment is large and it is not suitable for large-scale Cow manure treatment. There are also some family farms that use cow dung to raise earthworms and grow edible fungi, which can effectively solve the problem of cow dung. Domestically, there are methods such as using cow dung to raise earthworms and growing edible fungi to deal with cow dung, but they are only suitable for small-scale pastures. At present, the mainstream large-scale dairy farms in China have thousands of cows and tens of thousands of cows, and the above methods can...

AI Technical Summary

Problems solved by technology

Generally, new large-scale pastures require a large investment, and a professional environmental protection team is required to operate the organic fertilizer center. Since the moisture content of fresh cow dung is as high as 85% and the nutritional content is low, it is difficult to meet the organic fertilizer standards stipulated by the state. Chicken manure needs to be added. Manure, pig manure, etc. adjust fertility, the production cost is high, and sales are difficult