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Preparation method and application of solidified microsphere type fertilizer for soil remediation

A technology of soil remediation and microspheres, which is applied in the direction of solid/semi-solid fertilizers, application, calcium fertilizers, etc. It can solve the problems of secondary release, low phytoremediation efficiency, and interference with normal cultivation of crops, etc., so that the materials are convenient and easy to obtain , to avoid the risk of secondary pollution, to avoid the effect of toxic effects

Active Publication Date: 2021-09-28
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phytoremediation has low efficiency and interferes with the normal cultivation of crops, so it is not suitable for farmland soil remediation of normal crops
Ore-forming solidification can adsorb and fix heavy metals through the formation of calcite minerals. The ore-forming solidification technology has a good effect and a wide range of applications, but the heavy metals adsorbed on calcite minerals during the long-term solidification process may have the risk of secondary release

Method used

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  • Preparation method and application of solidified microsphere type fertilizer for soil remediation
  • Preparation method and application of solidified microsphere type fertilizer for soil remediation
  • Preparation method and application of solidified microsphere type fertilizer for soil remediation

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preparation example Construction

[0032] like figure 1 Shown, the application is a kind of solidified microsphere type fertilizer preparation method for soil restoration, comprising:

[0033] Sodium alginate powder, urea, Fe 3 o 4 The nano powder is dissolved in deionized water, and the mixed solution is obtained after high-speed stirring;

[0034] Drop the calcium chloride solution into the mixed solution through the peristaltic pump, and the alginate solidified microspheres form the alginate solidified microspheres, and take them out for later use;

[0035] Dissolve chitosan powder in dilute acetic acid solution, stir to make chitosan solution and set aside;

[0036] Add alginate solidified microspheres into the chitosan solution, stir at a low speed for a period of time, filter, wash and dry to obtain the solidified microsphere fertilizer for soil restoration.

[0037] In one embodiment, the mass content of sodium alginate in the mixed solution is 1wt%-3wt%.

[0038] In another embodiment, the urea pow...

Embodiment 1

[0053] (1) The preparation of solidified microsphere fertilizer is as follows:

[0054] Weigh 4.00g sodium alginate powder, 5.00g urea powder and 1.00g nano Fe 3 o 4 Put the powder in a beaker, add 200mL of deionized water to dissolve, and stir under 600r / min magnetic force for 2h to obtain a uniform mixed solution. Weigh 6g of anhydrous calcium chloride powder and place it in a 500mL beaker, add 400mL of deionized water to make a solution. The mixed solution was dripped into the calcium chloride solution through a peristaltic pump with an inner diameter of 2 mm to form alginate solidified microspheres, which were then taken out for later use.

[0055] Weigh 4.00g of chitosan powder and place it in a beaker, add 200mL of dilute acetic acid solution with a concentration of 1%, stir for 2h under magnetic stirring at 600r / min, after forming a uniform solution, add alginate solidified microspheres, Stir at a stirring speed of 100r / min for 30min, take it out, wash it with deioni...

Embodiment 2

[0064] (1) The preparation of solidified microsphere fertilizer is as follows:

[0065] Weigh 4.00g of sodium alginate powder, 5.00g of urea powder and 1.00g of nano-Fe3O4 powder into a beaker, add 200mL of deionized water to dissolve, and stir under 600r / min magnetic force for 2h to obtain a uniform mixed solution. Weigh 6g of anhydrous calcium chloride powder and place it in a 500mL beaker, add 400mL of deionized water to make a solution. The mixed solution was dripped into the calcium chloride solution through a peristaltic pump with an inner diameter of 2 mm to form alginate solidified microspheres, which were then taken out for later use.

[0066] Weigh 4.00g of chitosan powder and place it in a beaker, add 200mL of dilute acetic acid solution with a concentration of 1%, stir for 2h under magnetic stirring at 600r / min, after forming a uniform solution, add alginate solidified microspheres, Stir at a stirring speed of 100r / min for 30min, take it out, wash it with deionize...

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Abstract

The invention discloses a preparation method and application of a solidified microsphere type fertilizer for soil remediation. According to the method, sodium alginate powder, urea powder and Fe3O4 nano-powder are prepared to form a mixed solution; the mixed solution is dripped into a CaCl2 solution through a peristaltic pump to form alginate solidified microspheres; then the alginate solidified microspheres are wrapped with chitosan; and washing and drying are conducted to obtain the solidified microsphere type fertilizer. The prepared solidified microsphere type fertilizer is mixed with farmland soil, and then the solidified microsphere type fertilizer can continuously and slowly release urea wrapped by the solidified microsphere type fertilizer, improve the fertility of the farmland soil promote the growth of crops, remove heavy metal ions in the farmland soil, and reduce the residual quantity of heavy metal in crops to a safe edible standard.

Description

technical field [0001] The application belongs to the technical field of soil purification, and in particular relates to a preparation method and application of a solidified microsphere fertilizer for soil restoration. Background technique [0002] my country is a large agricultural country, and the quality of farmland soil is directly related to food security. At present, my country's farmland soil mainly has problems such as soil acidification and heavy metal pollution. These problems not only have a serious impact on the environment, but also directly affect human health. [0003] After the traditional urea nitrogen fertilizer is added to the soil, it will be released quickly. If the dosage is improper, the local urea concentration will increase, and the crops will not be able to fully absorb it in a short time. Excessive urea will cause crops to "burn seedlings", and the excess Urea can also enter the environment due to volatilization and leaching, causing environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/40C05G3/80C05G3/90C05G5/14C05G5/30
CPCC05C9/00C05G3/00C05G3/40C05G3/80C05G3/90C05G5/14C05G5/37C05D3/00C05F11/00
Inventor 张明章晓亮张凯华张道勇潘响亮
Owner ZHEJIANG UNIV OF TECH
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