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Method for preparing biochar-based fertilizer based on hydrothermal carbonization method

A biochar-based fertilizer, hydrothermal carbonization technology, applied in potash fertilizer, nitrogen fertilizer, phosphate fertilizer and other directions, can solve the problems of complex product composition, lack of nutrients, low carbon yield, etc., to solve impure products, improve fertilizer quality, improve quality effect

Pending Publication Date: 2022-05-10
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Biochar-based fertilizer is known as a new type of green and environmentally friendly fertilizer. At present, the compounding of biochar and fertilizer has become a new development direction of biochar-based fertilizer. There is still no relevant report on the raw material research of carbon-based fertilizer
In addition, if the food waste is directly subjected to hydrothermal carbonization without pretreatment, it will cause problems such as complex product components, high oil and salt, and low carbon output rate. After compounding with fertilizers, it is not conducive to improving the quality of fertilizers, and as fertilizers Applied to fields, still lacking various nutrients required by crops

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing biochar-based fertilizer based on a hydrothermal carbonization method, comprising:

[0029] Three-phase separation of food waste to obtain organic solid phase materials; the three-phase separation includes buffering, draining, sorting, pulping, sand removal, oil extraction and other operations to achieve oil-water-solid three-phase separation;

[0030] The organic solid phase material is pumped into the hydrothermal pre-reactor, and an acidic solvent including water and HCL solution is added, wherein the pH value of the acidic solvent is 2, and the concentration of the HCL solution is 0.01mol / L, and the organic solid phase material is mixed with The water content after mixing the acidic solvent is 85%, and the hydrothermal acidification treatment is carried out at 25°C for 10 minutes;

[0031] Pump the product of hydrothermal acidification treatment into the hydrothermal reaction kettle, hydrothermal carbonization at 250°C for 120 minutes, and the...

Embodiment 2

[0038] A method for preparing biochar-based fertilizer based on a hydrothermal carbonization method, comprising:

[0039] Three-phase separation of food waste to obtain organic solid phase materials; the three-phase separation includes buffering, draining, sorting, pulping, sand removal, oil extraction and other operations to achieve oil-water-solid three-phase separation;

[0040] The organic solid phase material is pumped into the hydrothermal pre-reactor, and an acidic solvent including water and HCL solution is added, wherein the pH value of the acidic solvent is 3, and the concentration of the HCL solution is 0.01mol / L, and the organic solid phase material is mixed with The water content after the acidic solvent is mixed is 80%, and the hydrothermal acidification treatment is carried out at 25°C for 20 minutes;

[0041] Pump the product of hydrothermal acidification treatment into a hydrothermal reaction kettle, and hydrothermally carbonize it at 220°C for 180 minutes. Th...

Embodiment 3

[0048] A method for preparing biochar-based fertilizer based on a hydrothermal carbonization method, comprising:

[0049] Three-phase separation of food waste to obtain organic solid phase materials; the three-phase separation includes buffering, draining, sorting, pulping, sand removal, oil extraction and other operations to achieve oil-water-solid three-phase separation;

[0050] The organic solid phase material is pumped into the hydrothermal pre-reactor, and an acidic solvent including water and HCL solution is added, wherein the pH value of the acidic solvent is 3, and the concentration of the HCL solution is 0.01mol / L, and the organic solid phase material is mixed with The water content after mixing the acidic solvent is 80%, and the hydrothermal acidification treatment is carried out at 30°C for 20 minutes;

[0051]Pump the product of hydrothermal acidification treatment into a hydrothermal reaction kettle, and hydrothermally carbonize it at 180°C for 240 minutes. The r...

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Abstract

The invention belongs to the technical field of biochar base fertilizer preparation, and discloses a method for preparing a biochar base fertilizer based on a hydrothermal carbonization method, and the method comprises the following steps: carrying out three-phase separation on kitchen waste to obtain an organic solid-phase material; mixing the organic solid-phase material with an acidic solvent, and carrying out hydrothermal acidification treatment; pumping a product subjected to hydrothermal acidification treatment into a hydrothermal reaction kettle, carrying out hydrothermal carbonization for 90-240 minutes at 180-250 DEG C, and cooling, dehydrating and drying a reaction product to form a biochar base; mixing the biochar base with an inorganic chemical fertilizer, calcium oxide, a binder and water, and extruding and granulating the mixture to obtain the biochar-based granulated fertilizer, in conclusion, in the method provided by the invention, the organic solid-phase material obtained after three-phase separation of the kitchen waste is used as a raw material for the hydrothermal carbonization reaction, and hot water acidification pretreatment is also performed, so that the defects of impure product, high oil content and high salt content after the reaction are effectively overcome, and the quality of the biomass charcoal is further effectively improved.

Description

technical field [0001] The invention belongs to the technical field of biochar-based fertilizer preparation, and in particular relates to a method for preparing biochar-based fertilizer based on a hydrothermal carbonization method. Background technique [0002] In recent years, the application of hydrothermal carbonization to treat food waste has received special attention. Compared with other thermochemical (cracking, liquefaction) and biological transformation (fermentation, composting) technologies, hydrothermal carbonization has the advantages of no drying of raw materials, low energy consumption, and equipment With the advantages of small size, high carbon fixation efficiency, and easy storage and transportation of products, it has significant advantages in treating organic waste with high moisture content and dispersion. [0003] Hydrothermal carbonization means that in a closed system, carbohydrates or lignocellulose are used as raw materials, and water is used as the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G5/12C05D9/00
CPCC05G3/00C05G5/12C05B1/02C05D9/00C05C9/00C05D1/02C05D3/02
Inventor 吕晓东王婷杨荣李健杨君林陈珩
Owner LANZHOU JIAOTONG UNIV
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