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Method for reducing phosphorus activity in compost product

A product and composting technology, applied in the field of phosphorus activity in organic waste composting products, can solve problems such as high cost, inability to use on a large scale, and adverse effects on the soil environment, and achieve low cost, reduce eutrophication of water bodies, and reduce land surface Effects of runoff phosphorus loss

Inactive Publication Date: 2014-11-26
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method cannot be used on a large scale because of its high cost and excessive application will cause adverse effects on the soil environment.

Method used

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  • Method for reducing phosphorus activity in compost product
  • Method for reducing phosphorus activity in compost product
  • Method for reducing phosphorus activity in compost product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix corn stalks and pig manure at a ratio of 3.3:1, adjust the carbon-to-nitrogen ratio to 20:1, and make a pile with an initial water content of 65%. Add 6% biochar to the pile, mix well, and use forced Aerobic composting is carried out for 45 days by ventilation method, and the forced ventilation is about 20m 3 / (t·m 3 ), the total phosphorus content and available phosphorus content in the obtained compost products were reduced by 21.67% and 32.28%, respectively.

[0018] Mix corn stalks and municipal sludge at a ratio of 5:1, adjust the carbon-to-nitrogen ratio to 30:1, and make a pile with an initial water content of 65%; add 6% peanut shell biochar to the pile, and mix well Afterwards, aerobic composting was carried out for 45 days with forced ventilation, and the forced ventilation volume was about 20m 3 / (t·m 3 ), the total phosphorus content and available phosphorus content in the obtained compost products were reduced by 13.33% and 13.23%, respectively.

[...

Embodiment 2

[0023] Apply the biochar-added compost product to the dry red soil and mix it fully with the soil. The amount of application is calculated according to the nitrogen demand of the local crops, that is, 150-180kg / hm 2 , cultivated for 30 days in the field with 70% water holding capacity and normal temperature. The content of available phosphorus in the soil of pig manure compost products added with 6% biochar, sludge compost products added with 6% peanut shell biochar and compost products added with 6% wheat straw biochar sludge decreased by 24.07%, 17.93% and 14.36%, the most obvious effect is to add 6% bamboo charcoal.

[0024] Table 2. Available phosphorus content (mg / kg) of compost products added to red soil

[0025]

Embodiment 3

[0027] Apply biochar-added compost products to yellow soil in dry land and fully mix with the soil. The amount of application is calculated according to the nitrogen demand of local crops, that is, 150-180kg / hm 2 , cultivated for 30 days in the field with 70% water holding capacity and normal temperature. The content of available phosphorus in the soil of the pig manure compost products with 6% bamboo charcoal, the sludge compost products with 6% peanut shell charcoal and the compost products with 6% wheat straw charcoal sludge decreased by 36.02%, 27.82% and 15.47%, respectively, Still the effect of adding 6% bamboo charcoal is the most obvious.

[0028] Table 3. Available phosphorus content (mg / kg) of compost products added to yellow soil

[0029]

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Abstract

The invention belongs to the field of agricultural non-point source pollution control, and particularly relates to a method for reducing phosphorus activity in organic waste compost products such as municipal sludge or livestock manure. The method comprises the following steps: 1) carbonizing and pyrolyzing agricultural wastes into charcoal at 400 DEG C, and crushing the charcoal by a 50mesh sieve; 2) mixing aerobic crop straws of organic wastes with the municipal sludge or livestock manure according to the ratio, adjusting the carbon-nitrogen ratio to be (20-30) to 1 and the moisture content to be 65-70%, and preparing a pile body; 3) adding the pile body to the charcoal, fully mixing the charcoal evenly, then carrying out aerobic composting for 45 days in a forced ventilation manner, and crushing the charcoal into the product. According to the method disclosed by the invention, the phosphorus activity of the compost product can be reduced, the phosphorus loss caused by compost application is reduced, and effective resourceful treatment on the agricultural wastes and the municipal sludge or livestock manure can be carried out, so that the agricultural non-point source pollution load is reduced, and the water environment is protected.

Description

technical field [0001] The invention belongs to the field of agricultural pollution control, and in particular relates to a method for reducing phosphorus activity in organic waste composting products such as urban sludge or livestock manure. Background technique [0002] More than 66% of our country's lakes and reservoirs are in a state of eutrophication, and the prevention and control of water eutrophication is a major water environment problem that urgently needs to be solved in our country's lakes and reservoirs. Phosphorus is one of the most important factors leading to water eutrophication, and also plays a decisive role in the formation of water eutrophication. Studies have shown that the loss of nitrogen and phosphorus in farmland is considered to be one of the important reasons for the eutrophication of surface water bodies. In the total nutrient load of rivers and lakes in the United States, the load of agricultural non-point source pollution sources accounts for ...

Claims

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Application Information

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IPC IPC(8): C05F17/00C05G3/00
CPCY02W30/40
Inventor 赵秀兰孙文彬倪九派谢德体
Owner SOUTHWEST UNIVERSITY
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