Preparation method for rice straw carbon-based fertilizer for reducing rice field greenhouse gas emissions

A rice straw, carbon-based technology, applied in the directions of organic fertilizers, fertilizer mixtures, fertilization devices, etc., can solve the problems of unsuitable rice straw treatment, high energy consumption, high temperature, low production cost, simple equipment operation, and reduced emissions. Effect

Inactive Publication Date: 2016-02-10
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Hydrothermal carbonization using rice straw as raw material has not been reported in the prior art, and the pyrolytic carbonization m

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing rice straw charcoal-based fertilizers for reducing greenhouse gas emissions from paddy fields, comprising the following steps:

[0025] (1) pulverizing the rice straw biomass raw material to 60 orders;

[0026] (2) rice straw biomass raw material and water are mixed by 1:8;

[0027] (3) Put the mixed rice straw biomass raw material and water into a sealed hydrothermal carbonization reaction kettle, under anaerobic conditions, 200r min -1 Stir at a rotating speed of 180°C for 5 hours at a constant temperature;

[0028] (4) Then cool to room temperature, wash with distilled water, and dry at 105°C for 12 hours;

[0029] (5) The material obtained in step (3) is ground and passed through a 20-mesh sieve to obtain rice straw charcoal-based fertilizer A.

[0030] The yield of the rice straw charcoal-based fertilizer obtained in this example to reduce greenhouse gas emissions is 69.5%, the pH value is 8.41, and the specific surface area is 191.3m 2 / ...

Embodiment 2

[0037] A method for preparing rice straw charcoal-based fertilizers for reducing greenhouse gas emissions from paddy fields, comprising the following steps:

[0038] (1) The rice straw biomass raw material is pulverized to 80 orders;

[0039] (2) rice straw biomass raw material and water are mixed by 1:8;

[0040] (3) Put the mixed rice straw biomass raw material and water into a sealed hydrothermal carbonization reaction kettle, under anaerobic conditions, 250r min -1 Stir at a constant speed of 200°C for 4 hours;

[0041] (4) Then cool to room temperature, wash with distilled water, and dry at 105°C for 12 hours;

[0042] (5) Grinding the material obtained in step (3) and passing through a 20-mesh sieve to obtain rice straw charcoal-based fertilizer B.

[0043] The yield of the rice straw charcoal-based fertilizer obtained by this example to reduce greenhouse gas emissions is 67.4%, the pH value is 8.53, and the specific surface area is 194.6m 2 / g, total pore volume 0.0...

Embodiment 3

[0046] A method for preparing rice straw charcoal-based fertilizers for reducing greenhouse gas emissions from paddy fields, comprising the following steps:

[0047] (1) pulverizing the rice straw biomass raw material to 100 orders;

[0048] (2) rice straw biomass raw material and water are mixed by 1:6;

[0049] (3) Put the mixed rice straw biomass raw material and water into a sealed hydrothermal carbonization reaction kettle, under anaerobic conditions, 300r min -1 Stir at a constant speed of 220°C for 3 hours;

[0050] (4) Then cool to room temperature, wash with distilled water, and dry at 105°C for 12 hours;

[0051] (5) The material obtained in step (3) is ground and passed through a 20-mesh sieve to obtain rice straw charcoal-based fertilizer C.

[0052] The yield of the rice straw charcoal-based fertilizer obtained in this example to reduce greenhouse gas emissions is 62.7%, the pH value is 8.67, and the specific surface area is 198.3m 2 / g, total pore volume 0.097...

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Abstract

The invention belongs to the technical field of biomass charcoal preparation and particularly relates to a preparation method for rice straw carbon-based fertilizer for reducing rice field greenhouse gas emissions. The rice straw carbon-based fertilizer for reducing greenhouse gas emissions is prepared through hydrothermal carbonization and assimilation of CO2.

Description

technical field [0001] The invention belongs to the technical field of biochar preparation, and in particular relates to a method for preparing a rice straw charcoal-based fertilizer for reducing greenhouse gas emissions from paddy fields. Background technique [0002] The excessive emission of greenhouse gases has become an important source of global warming and a series of environmental problems it brings. Agriculture is one of the main sources of greenhouse gas emissions, and agricultural greenhouse gas emissions account for 14% of human activity greenhouse gas emissions, of which CH 4 and N 2 The increase in O concentration was mainly due to agricultural activities, which accounted for CH 4 and N 2 52% and 92.47% of the total O emissions. Paddy ecosystem is the global CH 4 and N 2 O and other important biological sources of greenhouse gas emissions, how to reduce global warming by reducing greenhouse gas emissions from rice paddy soil has increasingly become a topi...

Claims

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Application Information

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IPC IPC(8): C05G3/04C01B31/02C05G3/80
CPCC05F11/00Y02W30/40
Inventor 袁小利单胜道李松叶正钱
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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