Sterilization, deodorization and deep-dehydration method for livestock excrements

Abstract

The invention relates to the field of treatment of livestock excrements, and in particular relates to a sterilization, deodorization and deep-dehydration method for livestock excrements. The method comprises the steps of acidification, namely adjusting the pH of the livestock excrements to be 3 to 6 by using acid; oxidization, namely adding an oxidizing agent into the acidified livestock excrements at the ratio that 0.5 to 1.2 moles of oxidizing agent is added into every kilogram of dry livestock excrements, and performing uniform stirring; microwave heating treatment, namely heating the oxidized livestock excrements to 95 to 120 DEG C by using microwaves, and continuing performing microwave treatment while stirring for 5 to 12 minutes at the temperature; pressure filtration dehydration, namely performing pressure filtration dehydration on the microwave-treated livestock excrements by using a pressure filter. The method is low in using cost, easy to operate and high in treatment speed, and the treated livestock excrements are high in solid recovery rate, low in heat value reduction and high in dehydration degree.

Description

technical field [0001] The invention relates to the field of livestock and poultry manure treatment, in particular to a method for sterilization, deodorization and deep dehydration of livestock and poultry manure. Background technique [0002] In 2003, the production of livestock and poultry manure in my country was about 3.19 billion tons, which was 3.2 times that of industrial solid waste (1 billion tons) in that year, and the production of livestock and poultry manure was increasing year by year. While the total amount of livestock and poultry manure is large, the degree of intensification of the livestock and poultry breeding industry continues to increase. In 2009, the scale of pigs, dairy cows and laying hens reached 61%, 42% and 79% respectively, which makes the livestock and poultry manure Contradictions with the environment have gradually become prominent, and the adverse effects of livestock and poultry manure on water bodies, soil and atmospheric environments have...

AI Technical Summary

Problems solved by technology

Drying livestock and poultry manure by high-temperature drying often consumes a lot of energy, and the resulting cost is very high, so it is difficult to promote

[0012] The above-mentioned methods have their own shortcomings, so it is urgent to find a method for dehydrating livestock and poultry manure with fast speed, short cycle, high solid recovery rate, high degree of dehydration, low energy consumption and low cost.

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