Airtight aerobic production process of bio-organic fertilizer by municipal sludge or kitchen biogas residues

Abstract

The invention discloses an airtight aerobic production process of a bio-organic fertilizer by municipal sludge or kitchen biogas residues. The airtight aerobic production process comprises the following steps: (1), collecting sludge, kitchen waste and forestry and agricultural residues, stirring and mixing; (2), carrying out primary aerobic fermentation on the mixture, and meanwhile supplying gas; (3), carrying out secondary aerobic fermentation, and meanwhile supplying gas, wherein moisture content of the mixture is lowered to below 30% after the secondary aerobic fermentation is completed; (4), crushing and sieving the mixture to prepare an organic fertilizer; (5), homogenizing the sieved organic fertilizer and storing; and (6), packaging and delivering the organic fertilizer. The airtight aerobic production process disclosed by the invention has the advantages of simple process, large treatment capacity, short fermentation period, uniform material fermentation degree, good treatment effect, high automation degree and low treatment cost; the primary aerobic fermentation and the secondary aerobic fermentation are operated in a totally closed manner, so that the treatment process is free of peculiar smell; and the kitchen waste and the municipal sludge are changed into things of value, so that the organic fertilizer and a liquid bacterial fertilizer with high market values are produced.

Description

technical field [0001] The invention belongs to the technical field of urban garbage treatment, and in particular relates to a closed and aerobic process for producing bio-organic fertilizer from urban sludge or kitchen biogas residue. Background technique [0002] Food waste is the most important type of food waste, including food processing leftovers (kitchen waste) and food residues (swill) produced by families, schools, canteens and catering industries. Its composition is complex, mainly a mixture of oil, water, fruit peels, vegetables, rice noodles, fish, meat, bones, waste tableware, plastics, paper towels, etc. From the chemical composition, there are starch, cellulose, protein, lipids and inorganic salts. The amount of food waste in my country is very large, and it is showing a rapid upward trend. [0003] Food waste has obvious hazards and resource duality, and its characteristics can be summarized as follows: (1) High moisture content, up to 80% - 95%. ⑵ High sa...

AI Technical Summary

Problems solved by technology

[0006] (1) Pollution of the environment and impact on city appearance

Because food waste contains high organic matter and moisture, it is susceptible to the action of microorganisms, resulting in decay and deterioration; and the longer the waste is placed, the more serious the deterioration will be

Especially in summer, when the temperature is higher, the decay and deterioration will be faster. At this time, a large amount of percolation water and malodorous gas are likely to be produced, breeding mosquitoes, and causing adverse effects on environmental sanitation.

[0007] (2) Harmful to human health

[0009] (4) The infiltrate produced when food waste is piled up enters the sewage treatment system, which will increase the content of organic matter, thereby increasing the burden on the sewage treatment plant and increasing operating costs

It is a thick substance between liquid and solid, which can be transported by pump, but it is difficult to separate solid and liquid by settling

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