Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for extracting potassium from urine waste water and making carbon-based slow-release compound fertilizer

A slow-release, compound fertilizer technology, used in phosphate fertilizers, organic fertilizers, fertilization devices, etc., can solve problems such as soil fertility decline, and achieve the effect of improving barren soil and slow release of fertilizer efficiency.

Active Publication Date: 2017-06-20
BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of rich nutrient elements in urine and decreased soil fertility, the present invention proposes a method for extracting potassium from urine waste water and manufacturing carbon-based slow-release compound fertilizer and the carbon-based slow-release compound fertilizer thus prepared

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for extracting potassium from urine waste water and making carbon-based slow-release compound fertilizer
  • Method for extracting potassium from urine waste water and making carbon-based slow-release compound fertilizer
  • Method for extracting potassium from urine waste water and making carbon-based slow-release compound fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to the process parameters in Table 1, the following steps are adopted to extract potassium from urine wastewater and make carbon-based slow-release compound fertilizer:

[0038] (1) forest waste is washed and broken, and then soaked in magnesium chloride solution;

[0039] (2) The soaked forest waste is pyrolyzed in an oxygen-isolated environment to obtain modified biochar; the pyrolysis time is 2 hours;

[0040](3) Add the modified biochar into 5L of urine wastewater, stir at 200rpm for 24h, discard the supernatant after stirring, collect the sediment, and dry to obtain a carbon-based slow-release compound fertilizer.

[0041] Measuring Potassium Concentration C in Urine Wastewater K and potassium concentration C′ in urine wastewater after preparing carbon-based slow-release compound fertilizer K , each group of experiments was measured 3 times, and the recovery rate R of potassium in urine wastewater was calculated according to the following formula:

[0...

Embodiment 2-12

[0044] Except for the contents shown in Table 1, Examples 2 to 12 were carried out in a similar manner to Example 1, and the recovery rate R of potassium in urine wastewater was calculated.

[0045] Table 1 Process parameters and the recovery rate of potassium in urine wastewater

[0046] Example Magnesium chloride concentration / (g / L) Soaking time / (h) Pyrolysis temperature / (℃) Potassium recovery / (%) 1 50 3 400 75 2 100 3 400 80 3 300 3 400 85 4 500 3 400 88 5 700 3 400 90 6 300 0.5 400 70 7 300 1 400 81 8 300 5 400 85 9 300 3 300 78 10 300 3 550 87 11 300 3 700 89 12 300 3 800 88

[0047] As can be seen from Table 1, the concentration of magnesium chloride should not be too small. The recovery rate of potassium in urine wastewater increases with the extension of the soaking time of forest waste in magnesium chloride solution, but after the soaking time is greate...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for extracting potassium from urine wastewater and preparing a carbon-based slow-release compound fertilizer and a prepared carbon-based slow-release compound fertilizer. The recovery rate of potassium in the urine wastewater can be significantly increased, and when the method is used for the decomposed urine wastewater, the obtained fertilizer is a carbon-based slow-release nitrogen and phosphorus compound fertilizer, wherein the nitrogen fertilizer content ranges from 4% to 6% on a nitrogen basis, and the phosphate fertilizer content ranges from 20% to 30% on a phosphorus pentoxide basis; when the method is used for fresh urine or urine wastewater with ammonia nitrogen removed, the obtained fertilizer is a carbon-based slow-release phosphate and potassium compound fertilizer, wherein the potassium fertilizer content ranges from 15% to 20% on a potassium oxide basis, and the phosphate fertilizer content ranges 32% to 50% on the phosphorus pentoxide basis. In addition, the carbon-based slow-release compound fertilizer prepared through the method is rich in organic carbon, fertilizer efficiency release is slow, and poor soil can be significantly improved.

Description

technical field [0001] The invention relates to the technical field of urine waste water resource treatment, in particular to a method for extracting potassium from urine waste water and producing carbon-based slow-release compound fertilizer. Background technique [0002] The technical background related to the present invention will be described below, but these descriptions do not necessarily constitute the prior art of the present invention. [0003] Excessive use of chemical fertilizers in my country's agriculture can easily lead to a decline in land fertility and soil compaction. The porous structure of biochar can retain water and fertilizer, prevent the rapid loss of nutrients in fertilizer, and improve the utilization rate of fertilizer. Urine contains high concentrations of nutrients, about 8 kg of nitrogen, 0.8 kg of phosphorus and 2.2 kg of potassium per cubic meter of urine. Urine wastewater is collected separately and processed as resources to prepare slow-re...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/80
CPCC05B7/00C05G3/00C05G3/80C05D9/00C05F3/00
Inventor 汪诚文徐康宁李继云
Owner BEIJING GUOHUAN TSINGHUA ENVIRONMENT ENG DESIGN & RES INST CO LTD BEIJING CHINA