Emission reduction method of nitrous oxide during composting

A nitrous oxide and composting technology, applied in nitrous oxide capture, chemical instruments and methods, separation methods, etc.

Inactive Publication Date: 2013-05-01
ZHEJIANG UNIV
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Problems solved by technology

[0004] Although the method of adjusting composting process parameters (such as ventilation time, material density, turning frequency, etc.) 2 O emissio

Method used

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  • Emission reduction method of nitrous oxide during composting

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Embodiment

[0013] Two different composting treatments were designed, one without biochar and the other with biochar. The stacking materials are: 600 kg of pig manure + 400 kg of wood chips; 600 kg of pig manure + 400 kg of wood chips + 30 kg of biochar. The initial size of each stack is 2.2 m long x 1.8 m wide x 1.6 m high. The added biochar has a specific surface area of ​​359 m 2 g -1 , with an average particle size of 1 mm - 3 mm and a density of 0.4 g cm -3 , C / N is 118, pH (H 2 O) is 10.36, the quality is hard, has high stability and strong adsorption.

[0014] In the composting method of adding biochar, at the initial stage of composting, 15 kg of biochar was fully mixed with fresh pig manure and sawdust and placed in the compost tank to keep the initial moisture content of the compost material at 63.5% and the carbon-to-nitrogen ratio at 22.5; After 16 days of composting, 15 kg of biochar adsorbent was added again. The entire composting process adopts the strip-cut aerobic ...

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Abstract

The invention discloses an emission reduction method of nitrous oxide during composting. The emission reduction method comprises the steps that biomass charcoal serves as a nitrous oxide adsorbent; 20-40kg biomass charcoal is used for a composting raw material per ton and is added for two times; at the first time, 10-20kg biomass charcoal and the composting raw material are sufficiently mixed and placed in a composting tank to keep the water content and carbon nitrogen ratio of a composting initial material to be 60-70% and 20-25 respectively in a composting initial material stacking period; at the second time, 10-20kg biomass charcoal is added at 15th-18th day of the composting; a windrow composting technology is adopted in the whole composting process; pile turning is conducted manually or mechanically intermittently; the whole compost fermentation period is 30-45 days; and the fermentation temperature is higher than 60 DEG C in at least 8 consecutive days. The emission reduction method has the advantages of simplicity in operation, low cost, no secondary pollution caused by a production technology, and the like, and is applied to the animal manure composting, and has a very important practical significance in emission reduction, regulation and control of N2O during the composting.

Description

technical field [0001] The invention relates to a method for reducing emission of nitrous oxide in a composting process, and belongs to the field of agricultural ecological environment protection. Background technique [0002] With the rapid development of large-scale aquaculture in my country, the loss of N and P nutrients from aquaculture waste has become the main contributor to water environment pollution in my country, and has gradually become a limiting factor for the healthy and sustainable development of aquaculture. The results of the "First National Survey on Pollution Sources" show that the amount of livestock and poultry manure produced by large-scale livestock and poultry farms is 243 million tons. Therefore, it is of great significance to carry out the research on the pollution control and resource utilization technology of breeding waste, which can provide technical support for protecting the agricultural ecological environment and promoting the sustainable dev...

Claims

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Application Information

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IPC IPC(8): C05F17/00B01D53/02
CPCY02E50/343Y02C20/10Y02E50/30Y02P20/151Y02W30/40
Inventor 吴伟祥王成董达邓辉吕豪豪
Owner ZHEJIANG UNIV
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