Kitchen waste treatment method and organic fertilizer prepared thereby

Abstract

The invention belongs to the technical field of environmental protection and relates to a kitchen waste treatment method and an organic fertilizer prepared thereby. The kitchen waste treatment methodprovided by the invention comprises the following steps: (a) pre-treating kitchen wastes; (b) breeding hermetia illucens population, namely hatching hermetia illucens eggs into larva, remaining partial larva to pupate, mating and spawning to maintain the breeding cycle of the population, and providing enough eggs and treated larva for kitchen waste treatment; (c) treating the kitchen wastes by primary digestion of the hermetia illucens, namely inoculating the hermetia illucens eggs into a breeding material, digesting the kitchen wastes in the process of growing the eggs into the larva, and transforming the kitchen wastes into hermetia illucens proteins and fecula; (d) performing aerobic composting and secondary digestion, namely performing aerobic fermentation and aging and after-ripeningon the egg excrements and residual wastes obtained in the step (c), thereby obtaining the organic fertilizer. The biological hermetia illucens digestion technology and the aerobic composting technology for the kitchen wastes are organically coupled, the advantages are complemented with each other, and the resource utilization rate is improved.

Description

Technical field [0001] The invention belongs to the field of environmental protection, and relates to a garbage treatment method, in particular to a kitchen garbage treatment method and organic fertilizer prepared therefrom. Background technique [0002] Food waste accounts for about 40% to 50% of the total urban waste, and its storage time is a little longer, which will breed bacteria, mosquitoes, cockroaches, etc., which will have a bad impact on environmental sanitation and seriously affect the health of residents and the home environment; food waste is a city Difficulties of domestic waste disposal. [0003] The current treatment methods for food waste include: (1) Separate aerobic composting technology for food waste. This technology mainly includes: stack-type composting, which piles up the pre-processed pile into a pile, and covers it with rain-proof material Carry out aerobic fermentation, and realize the aerobic state in the pile by turning the pile regularly; forced vent...

AI Technical Summary

Problems solved by technology

[0004] However, the deficiencies of the existing aerobic composting technology are: a. Food waste has high moisture content and high oil and salt content, making direct composting difficult and the composting effect is not good; b. Food waste composting needs to add a lot of auxiliary materials, On the one hand, the scale of composting is limited by auxiliary materials. On the other hand, insufficient auxiliary materials will affect the composting effect, and auxiliary materials will also increase the cost of composting; c. Food waste has a high salt content, so direct aerobic composting will reduce the salt content in the finished organic fertilizer. Accumulation leads to high salt content in the product, and the phenomenon of "burning seedlings" of crops is prone to occur after application; d. Food waste is high in oil, and excessive oil will easily form an oil film between the bacteria and materials, hindering the full contact between bacteria and materials, reducing composting efficiency

[0005] The deficiencies of the existing kitchen waste black soldier fly bioconsumption technology are: a. The kitchen waste contains some organic matter that is not easily digested by the black soldier fly, and this part of organic matter mixed in the fly manure will reduce its direct use value; b. Most of the existing kitchen waste black soldier fly bioconsumption technology is to set up fly breeding racks, manually batching, inoculating, collecting eggs and other processes, the degree of mechanization is low, it is not convenient for intensive management, and it is impossible to form an industrial chain. High cost and low economic benefit; c. Heavy environmental pollution. The existing black soldier fly extensive breeding and kitchen waste disposal technology will produce a large amount of waste gas and organic waste water containing high concentrations of ammonia nitrogen: for waste gas, it is generally discharged through exhaust fans Pumping and drainage will cause great damage to the regional atmospheric ecological environment; as for waste water, it is generally the leachate from the pretreatment of kitchen waste and the waste water leaked from the breeding process, which is directly discharged, which will greatly damage the ecological environment of surrounding water bodies

[0006] To sum up, the existing food waste treatment methods have their own advantages and disadvantages. It is difficult for a single treatment process to meet the requirements of good treatment effect, high efficiency, low energy consumption and good environmental benefits at the same time.