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Preparation method of magnesium-enriched biochar for synchronously and efficiently recycling nitrogen and phosphorus nutrients in farm waste liquid and application of magnesium-enriched biochar

A technology for farms and biochar, applied in chemical instruments and methods, applications, waste fuels, etc., can solve the problems of few effective utilization methods, low comprehensive utilization efficiency, waste of resources and the environment, and achieve the improvement of plant rhizosphere environment, water Pollution control is extensive and the effect of promoting straw transformation

Active Publication Date: 2019-09-24
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] my country is the country with the largest output of agricultural waste in the world, but due to its few effective utilization methods and low comprehensive utilization efficiency, it leads to a large waste of resources and easy to cause environmental pollution, especially the environmental problems caused by straw burning. to stand out

Method used

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  • Preparation method of magnesium-enriched biochar for synchronously and efficiently recycling nitrogen and phosphorus nutrients in farm waste liquid and application of magnesium-enriched biochar
  • Preparation method of magnesium-enriched biochar for synchronously and efficiently recycling nitrogen and phosphorus nutrients in farm waste liquid and application of magnesium-enriched biochar
  • Preparation method of magnesium-enriched biochar for synchronously and efficiently recycling nitrogen and phosphorus nutrients in farm waste liquid and application of magnesium-enriched biochar

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Experimental program
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Effect test

Embodiment 1

[0028] The preparation method of magnesium-rich biochar for synchronously and efficiently recovering nitrogen and phosphorus nutrients in farm waste liquid of the present invention includes the following steps: (1) Adding biomass powder to magnesium chloride solution and mixing thoroughly, and microwave after mixing. Processed to obtain a magnesium chloride solution in which biomass is dispersed;

[0029] (2) Then the above solution is stirred for a certain period of time, filtered and dried to obtain magnesium-rich biomass; finally, the magnesium-rich biomass is transferred to an anoxic atmosphere and thermally cracked at a temperature of 450-700℃ to obtain synchronous high efficiency Magnesium-rich biochar that recycles nitrogen and phosphorus nutrients in waste liquid from farms.

[0030] The magnesium-rich biochar is prepared by the preparation method of the present invention.

[0031] The application of the magnesium-rich biochar of the present invention in the synchronous reco...

Embodiment 2

[0034] The difference between Example 2 and Example 1 is that in step (1), microwave-assisted impregnation: 9g of dry biomass powder is added to 100mL of magnesium chloride solution with a concentration of 1mol / L, mixed thoroughly and placed in a microwave environment Treat for 30 minutes, and continue magnetic stirring at 500 rpm for 8 hours to obtain a biomass mixed solution fully impregnated with magnesium chloride;

[0035] The lignocellulosic biomass powder is a sieved powder obtained by drying the lignocellulosic biomass at 60-105°C, pulverizing, and passing through a 100-mesh sieve. The lignocellulosic biomass is a combination of corn stover and sorghum stover. The 1mol / L magnesium chloride solution is MgCl 2 ·6H 2 O is made by dissolving in water. The microwave frequency in the microwave environment is 2.45 GHz, and the microwave power is 100 W.

[0036] In step (2), thermal cracking: filter the biomass solution fully impregnated with magnesium chloride obtained in step (...

Embodiment 3

[0038] Preparation of Magnesium-rich Biochar from Corn Stalks

[0039] The preparation method of magnesium-rich biochar for synchronously and efficiently recovering nitrogen and phosphorus nutrients in waste liquid from farms of the present invention includes the following steps: in step (1), microwave-assisted soaking: collecting corn in the experimental field of Anhui Agricultural University The straw is washed and dried at 90° C. and crushed. After crushing, it is passed through a 100-mesh sieve and the sieved corn stalk powder is collected. Take 6g corn stover powder and add it to 100mL 1.5mol / L MgCl 2 In the solution, mix well and treat for 20 minutes in a microwave environment with a power of 100W, and continue to magnetically stir at 300 rpm for 4 hours to obtain MgCl dispersed with corn stover powder 2 Solution. The microwave frequency in the microwave environment is 2.45 GHz, and the microwave power is 800 W.

[0040] In step (2), thermal cracking: filter the biomass solu...

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Abstract

The invention discloses a preparation method of magnesium-enriched biochar for synchronously and efficiently recycling nitrogen and phosphorus nutrients in farm waste liquid and application of the magnesium-enriched biochar. The preparation method of the magnesium-enriched biochar for synchronously and efficiently recycling the nitrogen and phosphorus nutrients in the farm waste liquid comprises the following steps that (1) biomass powder is added into a magnesium chloride solution and uniformly mixed, and after uniform mixing, microwave treatment is conducted to obtain the magnesium chloride solution in which the biomass is dispersed; (2) then after the solution is stirred for a certain time, filtering and drying are conducted to obtain magnesium-enriched biomass; finally, the magnesium-enriched biomass is transferred into an oxygen-deficient atmosphere, and thermal cracking is conducted at the temperature of 450-700 DEG C to prepare the magnesium-enriched biochar for synchronously and efficiently recycling the nitrogen and phosphorus nutrients in the farm waste liquid. The obtained carbon material can synchronously and efficiently recycle the nitrogen and phosphorus nutrients in the farm waste liquid, and biochar fertilizer obtained after recycling of nitrogen and phosphorus is controlled release fertilizer with an improvement effect on soil.

Description

Technical field [0001] The technical field of waste biological resource utilization and green agriculture to which the present invention belongs, specifically relates to a preparation method and application of magnesium-rich biochar for synchronously and efficiently recovering nitrogen and phosphorus nutrients in waste liquid from farms. [0002] technical background [0003] In recent years, the large-scale and intensive development of farms has made livestock and poultry manure the main source of agricultural non-point source pollution. Although with the promotion and construction of biogas projects, the organic carbon in livestock manure is converted into clean energy CH through anaerobic fermentation 4 , But a large amount of nitrogen and phosphorus are still NH 4 + , NO 3 - And PO 4 3- The form remains in the biogas slurry. Direct discharge of biogas slurry without treatment will exacerbate environmental degradation and is also a new source of agricultural non-point source pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/32C02F1/28C05G3/04C02F103/20C02F101/16C02F101/10C05G3/80
CPCB01J20/20B01J20/32C02F1/283C05D3/00C02F2103/20C02F2101/16C02F2101/105C05G3/80Y02E50/30
Inventor 马欢王琦罗伟晨张欣刘伟伟钱陵程备久
Owner ANHUI AGRICULTURAL UNIVERSITY
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