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KR-20260063910-A - Composting method for reducing odor of manure and compost prepared according to the method

KR20260063910AKR 20260063910 AKR20260063910 AKR 20260063910AKR-20260063910-A

Abstract

The present invention relates to a method for producing compost by reducing the odor of livestock manure using coffee grounds. The present invention comprises the steps of: separating solids from manure; adding sawdust to the solids to produce a mixture; adding coffee grounds to the mixture to produce compost; and maturing the compost.

Inventors

  • 박신영
  • 정연수
  • 김학연

Assignees

  • 국립공주대학교 산학협력단

Dates

Publication Date
20260507
Application Date
20241031

Claims (7)

  1. Step of separating solids from manure; A step of preparing a mixture by adding sawdust to the solids; A step of preparing compost by adding coffee grounds to a mixture; and The stage of composting; A method for producing compost that reduces the odor of manure, comprising
  2. In paragraph 1, A method for producing compost that reduces the odor of manure, wherein the above sawdust is added in an amount of 5 to 40 parts by weight per 100 parts by weight of solid content.
  3. In paragraph 1, A method for producing compost that reduces the odor of manure, wherein the above coffee grounds are added in an amount of 5 to 40 parts by weight per 100 parts by weight of solid content.
  4. In paragraph 1, A method for producing compost that reduces the odor of manure, wherein the average particle size of the coffee grounds is 5 to 10 mesh.
  5. In paragraph 1, A method for producing compost that reduces the odor of manure, wherein the above-mentioned maturation is performed for 7 to 35 days.
  6. Odor-reduced compost produced by the manufacturing method according to paragraph 1.
  7. In paragraph 6, Odor-reduced compost having a pH of 6.8 or lower.

Description

Composting method for reducing odor of manure and compost prepared according to the method The present invention relates to a method for producing compost by reducing the odor of manure using sawdust and coffee grounds, and to odor-reduced compost produced thereby. The odors generated during the storage or composting of livestock manure pollute people and the surrounding environment, so environmentally friendly treatment is required. However, complaints regarding the odor of livestock manure are continuously increasing, and the odor-causing substances in livestock manure include VFA, NH₃ , H₂S , CH₄ , amines, and N₂O . If these are decomposed through the composting process, the odor originating from livestock manure can be significantly reduced. However, due to the nature of livestock farms and livestock waste treatment facilities, severe odors are generated, and odor generation is a major cause of complaints as a form of secondary pollution. Ammonia (NH3), a representative odor-causing substance, is a colorless, irritating, water-soluble gas that can be detected even at low concentrations and is known to have adverse effects on respiratory tissues and organs that come into direct contact with it, such as the lungs and bronchi of livestock and humans. Compost produced from matured livestock manure can be applied to crop and fodder fields and plays a crucial role in eco-friendly circular agriculture. Accordingly, the government has prepared joint measures for the management and utilization of livestock manure to strengthen the coordination and ensure the effectiveness of livestock manure management policies, which were previously bifurcated between the Ministry of Agriculture, Food and Rural Affairs and the Ministry of Environment. Furthermore, basic guidelines for supporting livestock and crop farms have been established to ensure that livestock manure is efficiently utilized as a resource. Accordingly, research is needed to reduce the level of odor generation within livestock barns and in large-scale facilities, such as those producing compost and liquid fertilizer from livestock manure. Based on this, applied research for the efficient treatment of livestock manure to reduce odors is urgently required; therefore, the development of related technologies is necessary for a sustainable environment and the livestock industry. Meanwhile, coffee grounds are a byproduct remaining after making coffee, commonly referred to as "coffee residue." Approximately 15g of coffee beans are used to make a cup of Americano, but 14.97g—or 99.8%—of these beans are discarded as coffee grounds. Although coffee grounds are currently disposed of as waste, they are an organic resource with high recycling value; therefore, some environmental companies are implementing coffee grounds recycling projects to utilize discarded coffee grounds as eco-friendly materials. The annual volume of coffee grounds generated is approximately 149,038 tons (as of 2019), but as the annual growth rate of coffee consumption is predicted to be about 5%, the amount of discarded coffee grounds generated each year is expected to increase further. Under the Waste Management Act, coffee grounds are classified as household waste and disposed of through landfill or incineration; however, this process releases methane ( CH₄ ), a greenhouse gas, which is emerging as a social issue due to the greenhouse effect resulting in a global warming potential of 34. Coffee grounds have the ability to absorb humidity and odors, and they also serve as a natural insect repellent that repels pests that avoid the scent of coffee. Furthermore, the oil components in coffee grounds are known to be effective in removing grease and water stains. In particular, coffee grounds are known to contain sufficient nutrients necessary for plant growth, so they can be utilized as fertilizer or compost; they have already been partially commercialized and are attracting attention from farmers in suburban areas. Overseas, a separate collection system is being established and utilized to use coffee grounds as renewable energy. This is because coffee grounds have a higher calorific value of 5,678 kcal compared to wood pellets, a representative bioenergy raw material, which have a calorific value of 4,300 kcal per kg. In addition, since it is a food product, it is highly likely to be free from impurities such as heavy metals, and because it emits less dust compared to other fuels, the Korea Institute of Machinery and Materials developed a technology in Korea in 2019 to convert coffee grounds into bio-crude oil similar to petroleum. Research utilizing coffee grounds is becoming increasingly active within the domestic livestock industry. Studies have been conducted to enable the use of coffee grounds as bedding in cattle barns, replacing rice husks or sawdust, and research has also been carried out on reducing odors within livestock farms through technology that combines coffee grounds with beneficial