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Method for preparing slow-release fertilizer by recovering nitrogen and phosphorus in urine

A slow-release fertilizer and urine technology, applied in fertilization equipment, fertilizer mixture, application, etc., can solve the problems of difficult desorption, high cost of ammonia nitrogen adsorbent, low yield, etc., achieve high utilization efficiency, prolong release time, Sustained-release effect enhanced effect

Inactive Publication Date: 2018-01-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, there is an urgent need for a technical solution that can solve the problem of high cost, difficult desorption and low yield of traditional ammonia nitrogen adsorbents.

Method used

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  • Method for preparing slow-release fertilizer by recovering nitrogen and phosphorus in urine
  • Method for preparing slow-release fertilizer by recovering nitrogen and phosphorus in urine

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1 reclaims the method for preparing slow-release fertilizer from nitrogen and phosphorus in urine

[0027] The urine recovered in this embodiment comes from the original urine stored for six months, the ammonia nitrogen concentration of the original urine is 7925 mg / L, and the phosphate concentration is 161.3 mg / L.

[0028] First dilute the original urine 10 times and measure 100mL of urine into a closed container;

[0029] Then, add 5g of biochar and 0.025g of magnesium chloride to the urine, under the shaking condition of 150r / min shaker, fully stir for 4h, during which the pH value is controlled by sodium hydroxide solution to 9-11;

[0030] Stop stirring, the precipitate is fully settled for 2 hours, and the precipitate is collected;

[0031] The collected sediment is dried and granulated to obtain a soil improvement slow-release fertilizer rich in carbon, nitrogen and phosphorus nutrients.

[0032] The slow-release fertilizer has a carbon content of 84...

Embodiment 2

[0033] Embodiment 2 reclaims the method for nitrogen and phosphorus in the urine to prepare slow-release fertilizer

[0034] The urine recovered in this embodiment comes from the original urine stored for six months, the ammonia nitrogen concentration of the original urine is 7925 mg / L, and the phosphate concentration is 161.3 mg / L.

[0035] First dilute the original urine 5 times, and measure 100mL of urine into an airtight container;

[0036] Then, add 10g of biochar and 0.05g of magnesium oxide to the urine, and fully stir it for 8 hours under the condition of 100r / min shaking table;

[0037] Stop stirring, the precipitate is fully settled for 4h, and the precipitate is collected;

[0038] The collected sediment is dried and granulated to obtain a soil improvement slow-release fertilizer rich in carbon, nitrogen and phosphorus nutrients. The slow-release fertilizer has a carbon content of 80.2-91.4%, a nitrogen content of 7.1-13.2%, and a phosphorus content of 2.2-5.7%. ...

Embodiment 3

[0039] Embodiment 3 reclaims the method for nitrogen and phosphorus in the urine to prepare slow-release fertilizer

[0040] The urine recovered in this embodiment comes from the original urine stored for six months, the ammonia nitrogen concentration of the original urine is 7925 mg / L, and the phosphate concentration is 161.3 mg / L. Measure 100mL of original urine into a closed container;

[0041] Then, add 10g of biochar and 0.05g of magnesium oxide to the urine, and fully stir for 6 hours under the shaking condition of 200r / min;

[0042] Stop stirring, the precipitate is fully settled for 5h, and the precipitate is collected;

[0043] The collected sediment is dried and granulated to obtain a soil improvement slow-release fertilizer rich in carbon, nitrogen and phosphorus nutrients. The slow release fertilizer has a carbon content of 85.1-95.3%, a nitrogen content of 3.3-8.3%, and a phosphorus content of 1.5-3.6%.

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Abstract

The invention provides a method for recovering nitrogen and phosphorus in urine to prepare slow-release fertilizer, comprising the following steps: 1) Adding biochar and soluble magnesium salt to urine, under the condition of pH value of 9-11 Stir until the gray-white precipitate struvite is formed in the solution and adhere to the surface of the biochar to make it saturated; 2) Stop stirring to allow the struvite and saturated biochar to fully settle in the solution and collect the precipitate; 3) Put the The collected sediment is dried and granulated to obtain a soil improvement slow-release fertilizer rich in carbon, nitrogen and phosphorus nutrients.

Description

technical field [0001] The invention relates to domestic sewage resource treatment, in particular to a method for recovering nitrogen and phosphorus in urine to prepare slow-release fertilizer. Background technique [0002] With the advancement of large-scale urbanization in our country, the nitrogen and phosphorus in sewage have not been effectively controlled, which makes the water environment protection suffer more and more pressure, and the problem of eutrophication of water body is becoming more and more serious. At the same time, with the promotion of the use of chemical fertilizers, the excessive release of potential nutrients in agricultural soils has led to an increasingly serious problem of soil barrenness. In the face of these problems, separate collection of urine and wastewater from the source and resource treatment can be used to prepare slow-release fertilizers that can be applied to barren soil improvement, which can reduce the pressure of nitrogen and phosph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 汪诚文谢淘徐康宁张驰
Owner TSINGHUA UNIV
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