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A method to reduce nitrogen loss during aerobic composting

An aerobic composting and nitrogen technology, which is applied in the field of waste recycling, can solve the problems affecting the harmlessness of livestock and poultry manure, poor citric acid removal effect, etc., and achieves remarkable nitrogen retention effect, increased ammonia nitrogen content, and reduced ammonia loss. Effect

Active Publication Date: 2022-04-29
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The use of heavy metals in the process of livestock and poultry breeding can improve their resistance and promote their growth, which leads to a high content of heavy metals in livestock and poultry excrement, which affects the effect of composting technology to achieve harmless livestock and poultry manure. Chen Lihong et al. Adding citric acid and sodium ethylenediaminetetraacetic acid (EDTA) to the composting process of livestock and poultry manure to investigate the effect of removing heavy metals, the results show that EDTA has the best removal effect on copper, while citric acid has a poor removal effect
At present, there is no report on the use of acidic organic additives to reduce nitrogen loss during composting

Method used

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  • A method to reduce nitrogen loss during aerobic composting
  • A method to reduce nitrogen loss during aerobic composting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 Adding nitrilotriacetic acid accounting for 1% of the total mass of fermentation raw materials

[0038] Specific steps are as follows:

[0039]First, mix the residual sludge from sewage treatment in food factories and corn stalks with a particle size of 1mm in a mass ratio of 7:3, control the carbon-nitrogen ratio of the mixture to 25, and the water content to 55% to obtain fermentation raw materials, and then ammonia Triacetic acid is added into the fermentation raw materials according to the proportion of 1% of the total mass of the fermentation raw materials for aerobic fermentation to obtain compost products; wherein, the aerobic fermentation is to sequentially stir the fermentation raw materials after adding nitrilotriacetic acid, primary fermentation and secondary fermentation. Fermentation, the stirring time is 20min, the initial fermentation time is 7d, and the ventilation volume is 6m 3 / h, the time of secondary fermentation is 14 days, without ar...

Embodiment 2

[0040] Embodiment 2 Adding nitrilotriacetic acid accounting for 2.5% of the total mass of fermentation raw materials

[0041] Specific steps are as follows:

[0042] First, mix the residual sludge from sewage treatment in food factories and corn stalks with a particle size of 1mm in a mass ratio of 7:3, control the carbon-nitrogen ratio of the mixture to 25, and the water content to 55% to obtain fermentation raw materials, and then ammonia Triacetic acid is added into the fermentation raw materials according to the proportion of 2.5% of the total mass of the fermentation raw materials for aerobic fermentation to obtain compost products; wherein, the aerobic fermentation is to sequentially stir the fermentation raw materials after adding aminotriacetic acid, primary fermentation and secondary fermentation. Fermentation, the stirring time is 20min, the initial fermentation time is 7d, and the ventilation volume is 6m 3 / h, the time of secondary fermentation is 14 days, without...

Embodiment 3

[0043] Example 3 Adding nitrilotriacetic acid accounting for 3.8% of the total mass of fermentation raw materials

[0044] Specific steps are as follows:

[0045] First, mix the residual sludge from sewage treatment in food factories and corn stalks with a particle size of 1mm in a mass ratio of 7:3, control the carbon-nitrogen ratio of the mixture to 25, and the water content to 55% to obtain fermentation raw materials, and then ammonia Triacetic acid is added into the fermentation raw materials according to the proportion of 3.8% of the total mass of the fermentation raw materials for aerobic fermentation to obtain compost products; wherein, the aerobic fermentation is to sequentially stir the fermentation raw materials after adding nitrilotriacetic acid, primary fermentation and secondary fermentation. Fermentation, the stirring time is 20min, the initial fermentation time is 7d, and the ventilation volume is 6m 3 / h, the time of secondary fermentation is 14 days, without ...

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Abstract

The invention discloses a method for reducing nitrogen loss in an aerobic composting process, which belongs to the technical field of waste recycling. The invention provides a method for reducing the loss of ammonia in the process of composting by organic waste fermentation, which can significantly reduce the loss of ammonia in the process of composting by aerobic fermentation of organic waste, has better nitrogen retention effect and improves fertilizer efficiency; At the beginning of fermentation, the pH of the pile is 3.9-6.0, and there is no obvious or slight ammonia smell in the pile during the fermentation; at the end of the fermentation, the pH of the pile is 7.2-7.5, the C / N ratio is 9.9-14.5, and the ammonia nitrogen in the pile is The content increased by 60.6% to 446.5%, the nitrogen loss was 0.1 to 0.9g / kg, and the nitrogen loss was reduced by 18.2% to 90.9% compared with the blank control, and the advantages were obvious. The acidic chelating agent used in the method of the invention is nitrilotriacetic acid, which has low cost and has no toxic or side effects. Therefore, the compost produced by the method of the invention has low cost and no potential safety hazard.

Description

technical field [0001] The invention relates to a method for reducing nitrogen loss in an aerobic composting process, belonging to the technical field of waste recycling. Background technique [0002] In recent years, the output of urban sludge has increased year by year, and the annual output of sludge with a moisture content of about 80% has reached 3000t, and most of them have not been effectively treated. The residual sludge of food processing plants has a high content of organic matter, rich in nutrients, contains a large amount of protein, polysaccharide, fat, etc., and does not contain toxic and harmful substances. If appropriate methods are used to treat and utilize the surplus sludge of food processing plants, it is a good source of organic fertilizer. Aerobic composting is one of the most researched and widely used organic waste treatment methods. [0003] The forms of nitrogen in the pile include inorganic nitrogen and organic nitrogen. Among them, inorganic ni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/40C05F17/10
CPCC05F7/00C05F17/00C05G3/00C05F11/00Y02W30/40
Inventor 李秀芬程丰宋明淦齐希光
Owner JIANGNAN UNIV