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Preparation method of magnesium modified biochar for recovering nitrogen and phosphorus elements in urine

A biochar, nitrogen and phosphorus technology, applied in the direction of phosphorus compounds, magnesium phosphate fertilizers, non-metallic elements, etc., can solve the problems of aquatic animal death, water body deterioration, polluted waters, etc., to extend the effective use period, increase carbon, nitrogen and phosphorus, etc. Nutrient elements, the effect of improving soil pH

Inactive Publication Date: 2019-01-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the total volume of urine only accounts for about 4% of the total amount of urban sewage, it provides nearly 80% of the nitrogen and more than 50% of the phosphorus in urban sewage. Since urban sewage will be discharged into natural water bodies after treatment, Even some sewage and wastewater will be discharged directly without treatment, so the high concentration of nitrogen and phosphorus in sewage and wastewater will have a great impact on the water body. The most direct impact is the eutrophication of the water body, leading to the deterioration of the water body and the death of aquatic animals. polluted waters

Method used

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  • Preparation method of magnesium modified biochar for recovering nitrogen and phosphorus elements in urine
  • Preparation method of magnesium modified biochar for recovering nitrogen and phosphorus elements in urine
  • Preparation method of magnesium modified biochar for recovering nitrogen and phosphorus elements in urine

Examples

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Effect test

Embodiment 1

[0033] A method for preparing magnesium-modified biochar for recovering nitrogen and phosphorus elements in urine, comprising the following steps:

[0034] 1) Take a certain amount of magnesium acetate and dissolve it in water;

[0035] 2) Weighing a certain amount of biomass that needs to be prepared;

[0036] Wherein, the mass of magnesium ions in the step 1) is 36% of the biomass mass in the step 2);

[0037] 3) adding the biomass weighed in step 2) to the magnesium acetate solution in step 1), and stirring for 2 hours;

[0038] 4) Place the suspension obtained after stirring for 2 hours in an oven, and dry at 80°C;

[0039] 5) Grind the dried product, pass through a 20-mesh sieve, and place it in a 20mL crucible;

[0040] 6) Place the crucible in a muffle furnace and fire at 700°C for 2 hours;

[0041] 7) Wash the product with distilled water with a pH of 10, wash it once, and dry it in an oven at 50°C.

[0042] The step 3) should be carried out under constant stirrin...

Embodiment 2

[0044] A method for preparing magnesium-modified biochar for recovering nitrogen and phosphorus elements in urine, comprising the following steps:

[0045] 1) Take a certain amount of magnesium acetate and dissolve it in water;

[0046]2) Weighing a certain amount of biomass that needs to be prepared;

[0047] Wherein, the mass of magnesium ions in the step 1) is 40% of the biomass mass in the step 2);

[0048] 3) adding the biomass weighed in step 2) to the magnesium acetate solution in step 1), and stirring for 3 hours;

[0049] 4) Place the suspension obtained after stirring for 3 hours in an oven, and dry at 80°C;

[0050] 5) Grind the dried product, pass through a 20-mesh sieve, and place it in a 25mL crucible;

[0051] 6) Place the crucible in a muffle furnace and fire at 700°C for 2 hours;

[0052] 7) The product was washed with distilled water with a pH of 10, washed twice, and dried in an oven at 50°C.

[0053] The step 3) should be carried out under constant sti...

Embodiment 3

[0055] A method for preparing magnesium-modified biochar for recovering nitrogen and phosphorus elements in urine, comprising the following steps:

[0056] 1) Take a certain amount of magnesium acetate and dissolve it in water;

[0057] 2) Weighing a certain amount of biomass that needs to be prepared;

[0058] Wherein, the mass of magnesium ions in the step 1) is 36% of the biomass mass in the step 2);

[0059] 3) adding the biomass weighed in the step 2) to the magnesium acetate solution in the step 1), stirring for 5 hours;

[0060] 4) Place the suspension obtained after stirring for 5 hours in an oven, and dry at a temperature of 70°C;

[0061] 5) Grind the dried product, pass through a 40-mesh sieve, and place it in a 20mL crucible;

[0062] 6) Place the crucible in a muffle furnace and fire at 700°C for 2 hours;

[0063] 7) The product was washed with distilled water with a pH of 10.5, washed twice, and dried in an oven at 80°C.

[0064] Said step 3) should be carri...

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Abstract

The invention relates to a preparation method of magnesium modified biochar for recovering nitrogen and phosphorus elements in urine. The preparation method mainly comprises the following steps of: weighing of main substances; dissolution of magnesium acetate in water; stirring and mixing of biomasses and magnesium acetate solution; drying of mixed turbid liquid; burning of drying products in a muffle furnace; and cleaning and drying of the biomasses. Magnesium elements are adhered to the surfaces of the modified biochar prepared by adoption of the method, and magnesium phosphate and struviteprecipitates can be generated in urine wastewater rich in nitrogen and phosphorus elements, so that the method has positive effects in the aspects of recovering nutritional elements in urine wastewater and recycling waste biomasses.

Description

technical field [0001] The invention belongs to the technical field of solid compound synthesis, and in particular relates to a preparation method of magnesium-modified biochar for recovering nitrogen and phosphorus elements in urine. Background technique [0002] In contemporary society, with the continuous progress of the economy, the continuous progress of industrial and agricultural production, various environmental problems arise spontaneously, especially with the continuous growth of the population, the demand for food is increasing, and the greater demand for food Promote the gradual increase in the use of chemical fertilizers in agricultural production, and for the used wastewater, the phosphate fertilizers mainly come from the mining and smelting of phosphorus minerals, and most of the used phosphorus resources will go through the element cycle and eventually end up in sediment The form of phosphorus is stored on the seabed, making phosphorus resources a non-renewab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/58C01B25/34C01B25/45C05B7/00C05B9/00C02F101/16
CPCB01J20/20B01J20/3078B01J2220/4825B01J2220/4881C01B25/34C01B25/451C02F1/28C02F1/58C02F1/586C02F2101/105C02F2101/16C05B7/00C05B9/00
Inventor 李志鹏孙佩哲张若纯
Owner TIANJIN UNIV
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