Nitrogen-retaining and carbon-retaining compost preparation method

A technology for composting and raw materials, applied in the field of environmental engineering, can solve the problems of high cost, difficulty in obtaining, and application of exogenous additives, and achieve good practical significance, environmental benefits, low cost, and the effect of increasing content.

Inactive Publication Date: 2016-04-27
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, many experimental studies have been carried out at home and abroad on different types of additives to maintain nitrogen and carbon, and reduce compost

Method used

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  • Nitrogen-retaining and carbon-retaining compost preparation method
  • Nitrogen-retaining and carbon-retaining compost preparation method
  • Nitrogen-retaining and carbon-retaining compost preparation method

Examples

Experimental program
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Embodiment 1

[0029] Embodiment 1, the compost preparation method of nitrogen conservation, carbon conservation

[0030] (1) The raw materials for composting are fresh pig manure and corn stalks (the stalks are crushed to a length of 2-5 cm by a grinder), and mixed according to the mass of fresh base at 6.5:1. The basic properties of the initial materials are shown in Table 1.

[0031] In this embodiment, 3 treatment groups were set up, including 2 experimental groups and 1 control group, wherein the control group (CK) only had fresh pig manure and corn stalks, and no superphosphate was added. In the experimental group 1 (T1), in addition to the compost raw materials, the amount of substance added is 20% (marked as 0.20M) superphosphate (its quality is equivalent to 13.2% of the dry mass of the initial material); the experimental group 2 (T2) except the compost raw material, also add the superphosphate (its quality is equivalent to 16.5% of initial material dry mass) that the amount additi...

Embodiment 2

[0042] Embodiment 2, the addition of calcium superphosphate on compost carbon content, nitrogen content and compost output, quality impact in composting process

[0043] (1) Changes in temperature during composting

[0044] Temperature is an important indicator to reflect the degradation status of organic matter in the pile. During composting in embodiment 1, the heap body center temperature of each treatment group changes with time as figure 1 shown.

[0045] from figure 1It can be seen from the figure that the control group reached the high temperature period (>50°C) on the 3rd day of composting, while the experimental groups T1 and T2 delayed until the 15th day to reach the high temperature period of composting, which had a certain impact on the heating process of the compost. After the high temperature period lasted for about 30 days in the control group and the experimental group respectively, the temperature of the pile gradually decreased. This is because after the ...

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Abstract

The invention discloses a nitrogen-retaining and carbon-retaining compost preparation method. The method comprises the following steps: under the action of an additive, compost raw materials are subjected to aerobic fermentation, such that the compost is obtained. The additive is calcium superphosphate. The amount of substance of phosphorus element in calcium superphosphate is 20-25% of the amount of substance of total nitrogen of the compost raw materials. The compost is a mixture of fresh pig manure and corn stalks. The compost preparation method provided by the invention has the advantages of low cost and simple operation. While nitrogen loss and carbon loss during a composting process are controlled, the compost product can reach the requirements of an organic fertilizer industry standard. With the method, compost product nutrient content can be improved, an agricultural organic waste-to-fertilizer conversion rate can be improved, and greenhouse gas emission during the composting process can be reduced. Therefore, energy saving and emission reduction of the preparation process are realized. The method has good practical significance and environment benefit.

Description

technical field [0001] The invention relates to a method for preparing compost for maintaining nitrogen and carbon, and belongs to the field of environmental engineering. Background technique [0002] High-temperature aerobic composting is one of the effective ways to treat livestock and poultry manure, and it is widely used around the world. The transfer and transformation of nitrogen in the high-temperature composting process has always been a research hotspot at home and abroad. The large amount of ammonia volatilization caused by the degradation of organic matter accompanied by high temperature is the main reason for the loss of nitrogen in composting. Numerous studies have shown that ammonia volatilization during the composting process accounts for about 20% to 60% of the total nitrogen mass of the compost, which not only causes air pollution, but also causes nutrient resource loss. drain. In addition, some nutrients are lost in the form of nitrous oxide and methane du...

Claims

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Application Information

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IPC IPC(8): C05F17/00
CPCY02W30/40
Inventor 李国学罗一鸣杜龙龙袁京
Owner CHINA AGRI UNIV
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