A high-temperature composting method without adding auxiliary materials and adjusting the carbon-nitrogen ratio

Abstract

The invention discloses a high-temperature composting method without addition of auxiliary materials and adjustment of a carbon-nitrogen ratio. According to the method, fermented decomposed materials for high-temperature composting are adopted as backmixing materials to replace traditional straw auxiliary materials, the moisture content of the raw materials for fermentation is adjusted to be 50-60%, meanwhile, by adding an appropriate quantity of mixed microbial inocula which are low in C / N ratio and special for fermentation, the C / N ratio of the raw materials does not need to be adjusted additionally, and then high-temperature compost is conducted to obtain the decomposed materials of the high-temperature compost. The method can not only simplify the fermentation procedures of the compost and shorten the fermentation cycle, but remarkably reduce production costs. Through adoption of the high-temperature composting technique, organic waste including excrement of livestock and the like can reach the harmless hygienic standard GB 7959-1987 for excrement; after detection of relevant departments, the total nutrient of decomposed products meets the organic fertilizer demand NY 525-2012, and therefore the decomposed products can be used for production of organic fertilizer. Compared with traditional high-temperature composting techniques, by adopting the high-temperature composting technique, production cost can be reduced by 50 yuan per ton.

Description

technical field [0001] The technology belongs to the technical field of resource treatment of livestock and poultry manure waste, and specifically relates to a high-temperature composting method without adding auxiliary materials and adjusting the carbon-nitrogen ratio. Background technique [0002] my country is a large agricultural country, which produces a large amount of organic solid waste every year. At present, my country's livestock and poultry breeding pollution has become one of the main sources of agricultural non-point source pollution, and it is a major problem that urgently needs to be solved in the construction of my country's ecological civilization. my country's livestock and poultry breeding industry produces about 3.8 billion tons of manure every year, which is equivalent to 32 million tons of pure nutrients, which is equivalent to about 50% of the total nutrient input of chemical fertilizers in my country. Due to the lack of efficient and low-cost treatme...

AI Technical Summary

Problems solved by technology

The moisture content of traditional livestock and poultry manure and other wastes is relatively high (generally up to 80%). If it is directly used for composting, it will cause poor ventilation, form an anaerobic area and enter an anaerobic fermentation state, which will affect the fermentation effect

Therefore, the traditional high-temperature aerobic composting technology needs to add a large amount (20-40%) of straw-like auxiliary materials to the raw materials to adjust the moisture content and C / N ratio of the fermentation raw materials, while the price of auxiliary materials is increasing year by year and the supply in some places is tight. As a result, the cost of composting enterprises has increased significantly, and it is difficult for enterprises to survive with meager profits

In particular, cow dung contains a large amount of lignin and cellulose that have not been digested and absorbed by cows. The C / N ratio is relatively low, and it is not easy to degrade and decompose, resulting in incomplete and thorough fermentation of high-temperature composting with low C / N ratio of cow dung.

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