Method for preparing biochar from tea garden waste and biochar

A waste and biochar technology, which is applied in the field of biomass resource utilization and environmental restoration, can solve the problems of unsuitable tea garden waste biochar, complicated steps, and differences in the internal structure of biochar materials, so as to improve crop yield and quality. , the variety of elements, the effect of alleviating the acidification of farming soil

Inactive Publication Date: 2020-12-18
TEA RES INST GUANGDONG ACAD OF AGRI SCI
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  • Abstract
  • Description
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Problems solved by technology

[0004] Therefore, the use of tea garden waste to prepare biochar materials has important research value in implementing the concept of circular economy and improving resource utilization and efficiency. However, due to differences in biomass raw materials and preparation conditions, the resulting biochar materials will There are also significant differences in the improvement of soil fertility and the reduction of heavy metal pollution
Patent CN201410120785.6 provides a method for preparing biochar based on agricultural and forestry wastes, which is used for the preparation of rice straw, rice husk, sawdust, traditional Chinese medicine residue, and peanut shell biochar. Activation, washing, drying, the steps are tedious, and based on the specificity of the microstructure of tea garden waste materials, this method is not suitable for the preparation of tea garden waste biochar

Method used

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  • Method for preparing biochar from tea garden waste and biochar
  • Method for preparing biochar from tea garden waste and biochar
  • Method for preparing biochar from tea garden waste and biochar

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Experimental program
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Effect test

Embodiment 1

[0034] The biochar obtained by different preparation methods of embodiment 1

[0035] 1. Preparation method

[0036] S1. After the tea garden wastes are naturally air-dried, the tea branches are dried at 80°C for 24 hours; the tea leaves are dried at 70°C for 12 hours;

[0037] S2. Grinding the dried tea garden waste and passing through a 4-mesh sieve to obtain a powdery biomass raw material;

[0038] S3. Place the biomass raw material in a sealed pyrolysis carbonization furnace, and feed nitrogen gas, the flow rate of nitrogen gas is 2 L / min, and the feeding time is 20 minutes, and then carry out two-stage heating treatment:

[0039] The first stage: from room temperature to T1, the heating rate is V1, and the holding time is K;

[0040] The second stage: continue to heat up from the final temperature of the first stage to T2, the heating rate is V2, and the pyrolysis time is H;

[0041] S4. Cool the biomass raw material that has been pyrolyzed in step S3 to room temperatu...

Embodiment 2

[0063] Example 2 biochar to Cd 2+ Adsorption experiment

[0064] (1) Experimental method:

[0065] Test the biochar prepared by Example 1 to Cd 2+ The adsorption kinetics of:

[0066] Accurately weigh 0.01g of biochar with different Cd 2+ Concentrations (20, 50, 100mg / L) in 10mL solution, at pH 7, rotation speed 150r / min, carry out vibration adsorption test, take samples at different time points such as 1, 3, 5, 7, 24h, etc., use AAS Determination of Cd in the supernatant 2+ concentration. Through the equation, calculate the effect of biochar on Cd at different reaction times 2+ the amount of adsorption.

[0067] Qt=(C0-Ct) / M

[0068] In the formula: Qt is the Cd in the unit mass biochar adsorption solution at time t 2+ The amount (mg / g); C0 is Cd in the initial solution 2 + Concentration (mg / L); Ct is Cd in the solution at time t 2+ Concentration (mg / L); V is the volume of the reaction solution (mL); M is the mass of biochar added (g).

[0069] Adsorption of Cd o...

Embodiment 3

[0078] Embodiment 3 pot experiment

[0079] (1) Experimental method

[0080] The biochar prepared in Example 1 was carried out to a pot test: taking the standard annual tea seedlings as the test object, the cadmium-contaminated soil was improved by using different biochars to evaluate the effects of biochar on the content of cadmium in the soil, soil Nutrients and their influence on soil pH value, analyzing the influence of using the biochar material of the present invention on soil physical and chemical properties.

[0081] (2) Experimental results

[0082] Soil physical and chemical properties after 12 months of table 6 test

[0083]

[0084] It can be seen from the data in Table 6 that the biochar prepared by the present invention can significantly increase the content of organic matter in the soil, increase the pH value of the soil, improve the acidic soil, and reduce the activity of heavy metal cadmium in the soil.

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Abstract

The invention discloses a method for preparing biochar from tea garden waste and the biochar. Waste such as tea branches and tea leaves obtained after tea garden pruning is used as a raw material forpreparing biochar; the prepared biochar has the characteristics of high pH value, developed pore structure, large specific surface area, various element varieties and the like, so that the biochar hasgood adsorption performance, can adsorb and fix various pollutants in an environment medium of a production place and reduce the bioavailability of the pollutants, can be effectively applied to the fields of agriculture and environment, and has wide application prospects. And potential environmental risks are reduced.

Description

technical field [0001] The invention relates to the technical fields of biomass resource utilization and environmental restoration. More specifically, it relates to a method and biochar for preparing biochar based on tea plantation waste. Background technique [0002] Biochar is a carbon-rich, fine-grained, porous material produced by thermally decomposing biomass at high temperature under oxygen-limited conditions. It has surface adsorption, increases the adsorption of nutrients by soil, and reduces emissions to the atmosphere and water. , reduce environmental pollution, improve nutrient utilization, etc. have a certain effect, coupled with its low price, environmental protection and other advantages, biochar has received more and more attention in dealing with soil nutrients, acidification and heavy metals. In addition, the organic combination of biochar and ordinary organic fertilizer has the advantages of improving soil nutrients, improving fertilizer utilization rate, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C05G3/40C09K17/02C09K101/00
CPCC09K17/02C09K2101/00C01B32/05C05G3/40
Inventor 周巧仪凌彩金郜礼阳林威鹏刘淑媚
Owner TEA RES INST GUANGDONG ACAD OF AGRI SCI
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