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Method for recovering phosphorus and potassium from urine effluent and producing slow-release composite fertilizer of phosphorus and potassium

A compound fertilizer and slow-release technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve problems such as recycling technology gaps, and achieve the effect of not being easy to lose

Active Publication Date: 2013-09-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the summary found that currently more technical methods are mainly focused on the recovery of nitrogen and phosphorus, while the recovery technology of potassium, an important resource in urine, is blank

Method used

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  • Method for recovering phosphorus and potassium from urine effluent and producing slow-release composite fertilizer of phosphorus and potassium
  • Method for recovering phosphorus and potassium from urine effluent and producing slow-release composite fertilizer of phosphorus and potassium

Examples

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Embodiment 1

[0032] The properties of urine sewage from which ammonia nitrogen has been completely removed are shown in Table 1. Add solid MgCl first 2 ·6H 2 O to adjust Mg in solution 2+ : K + The molar ratio is 2, adding solid Na 2 HPO 4 12H 2 O to adjust PO in solution 4 3- : K + Molar ratio is 2, Mg in solution 2+ :PO 4 3- The molar ratio is 1, and then under the condition of 150r / min mechanical arm stirring, adjust the pH of the solution to 10 to allow the solution to react for 20 minutes. After settling for 20 minutes, the precipitated product is collected, and finally dried and granulated to produce slow-release granular phosphorus and potassium compound fertilizer. . The recovery efficiency of the method for phosphorus and potassium in urine sewage is shown in Table 1. The potassium fertilizer content in the compound fertilizer is 12% (calculated as dipotassium oxide), and the content of phosphate fertilizer is 41% (calculated as phosphorus pentoxide).

[0033] The na...

Embodiment 2

[0036]The properties of urine sewage from which ammonia nitrogen has been completely removed are shown in Table 1. Add solid MgCl first 2 ·6H 2 O to adjust Mg in solution 2+ : K + The molar ratio is 3, adding solid Na 2 HPO 4 12H 2 O to adjust PO in solution 4 3- : K + The molar ratio is 3, the Mg in the solution 2+ :PO 4 3- The molar ratio is 1, and then under the condition of 200r / min mechanical arm stirring, the pH of the solution is adjusted to 10 so that the reaction in the solution is carried out for 40 minutes, and the precipitated product is collected after settling for 20 minutes, and finally dried and granulated to produce slow-release granular phosphorus and potassium compound fertilizer . The recovery efficiency of the method for phosphorus and potassium in urine sewage is shown in Table 1. The potassium fertilizer content in the compound fertilizer is 8% (calculated as dipotassium oxide), and the content of phosphate fertilizer is 43% (calculated as p...

Embodiment 3

[0040] The properties of urine sewage from which ammonia nitrogen has been completely removed are shown in Table 1. Add solid MgCl first 2 ·6H 2 O to adjust Mg in solution 2+ : K + The molar ratio is 4, adding solid Na 2 HPO 4 12H 2 O to adjust PO in solution 4 3- : K + Molar ratio is 4, Mg in solution 2+ :PO 4 3- The molar ratio is 1, and then under the condition of 200r / min mechanical arm stirring, the pH of the solution is adjusted to 10 so that the reaction in the solution is carried out for 20 minutes, and the precipitated product is collected after settling for 80 minutes, and finally dried and granulated to produce slow-release granular phosphorus-potassium compound fertilizer . The recovery efficiency of the method for phosphorus and potassium in urine sewage is shown in Table 1. The potassium fertilizer content in the compound fertilizer is 6% (calculated as dipotassium oxide), and the content of phosphate fertilizer is 47% (calculated as phosphorus pento...

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Abstract

The invention provides a method for recovering phosphorus and potassium from urine effluent and producing a slow-release composite fertilizer of phosphorus and potassium, belonging to the technical field of effluent treatment, recovery of phosphorus and potassium and production of fertilizers in agriculture. The method comprises the following steps: based on the analysis of the property of the urine effluent, adding dissolved magnesium salt and phosphate to adjust a molar ratio of Mg<2+> to K<+> to PO4<3-> in the solution to an appropriate value, then adjusting the PH value to an appropriate value with stirring to form precipitates in the solution, after the settlement of the precipitates, collecting the precipitates, finally carrying out drying and granulation to produce the slow-releasecomposite fertilizer of phosphorus and potassium. According to the invention, the recovery rate of potassium can reach to more than 75%, and the recovery rate of phosphorus can reach to more than 90%. The produced composite fertilizer of phosphorus and potassium has 6-13% of potash fertilizer (measured as K2O) and 32-50% of phosphate fertilizer (measured as P2O5). The fertilizer efficiency is released slowly, so that the produced composite fertilizer is a slow-release composite fertilizer of phosphorus and potassium with the advantage that the fertilizer efficiency is not easy to lost with irrigation water.

Description

technical field [0001] The invention belongs to the field of sewage treatment, phosphorus and potassium recovery and production process of phosphorus and potassium compound fertilizer, and relates to a method for recovering phosphorus and potassium from urine sewage and manufacturing slow-release phosphorus and potassium compound fertilizer. Background technique [0002] Nitrogen, phosphorus and potassium are the three most important nutrients for crops. However, the shortage of phosphorus and potassium resources has increasingly become a serious problem in the economic development of countries all over the world, especially China. The world's proven reserves of phosphate rock resources can only last for 80 to 100 years. Potassium ores are mainly concentrated in a few countries. The potassium needed by China is heavily dependent on imports. Imported potassium has long been more than 70%. Phosphorus and potassium are all listed by the Ministry of Land and Resources Listed as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00
Inventor 汪诚文徐康宁
Owner TSINGHUA UNIV
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