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Method for treating common pollutants in environment through combination of biochar and micro-plastics

A technology of microplastics and biochar, applied in the direction of sustainable biological treatment, restoration of polluted soil, chemical instruments and methods, etc., can solve the problems of interaction that need further research, so as to avoid secondary microplastic pollution, operation Convenience and good compound effect

Active Publication Date: 2022-04-12
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the combination mechanism of microplastics and organic matter and the interaction with biochar still need further research.

Method used

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  • Method for treating common pollutants in environment through combination of biochar and micro-plastics

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A method for treating common pollutants in the environment with biochar combined with microplastics, comprising the following steps:

[0032] S1. Preparation of biochar: take wheat straw and expose it to the sun for 2 days, wash it with distilled water for 3 times, and then dry it in an oven at 78°C for 7 hours. Wheat straw was placed in a tube furnace and heated to 400°C at a heating rate of 22°C / min, kept for carbonization for 1 hour, then heated to 500°C at a heating rate of 10°C / min, kept for carbonization for 2.5 hours, cooled to room temperature, and then taken out. Grinding the carbonized wheat straw in a grinder to a wheat straw biochar powder with an average particle size of 0.3 mm;

[0033] S2. Preparation of microplastics: take polyethylene microplastics and pulverize them in a pulverizer, and sieve the pulverized microplastics through a 70-mesh sieve to obtain microplastic powders;

[0034]S3, mixing preparation:

[0035] S3-1. Pre-cooling treatment: Mix t...

Embodiment 2

[0042] The difference between this example and Example 1 lies in that the parameters of the biochar preparation process in step S1 are different.

[0043] S1. Preparation of biochar: take wheat straw and expose it to the sun for 2 days, wash it with distilled water for 3 times, and then dry it in an oven at 75°C for 6 hours. Wheat straw was placed in a tube furnace and heated to 400°C at a heating rate of 20°C / min, kept for carbonization for 1 hour, then heated to 500°C at a heating rate of 10°C / min, kept for carbonization for 2 hours, cooled to room temperature, and taken out. The carbonized wheat straw was ground in a grinder to a wheat straw biochar powder with an average particle size of 0.15 mm.

Embodiment 3

[0045] The difference between this embodiment and the embodiment lies in that the parameters of the biochar preparation process in step S1 are different.

[0046] S1. Preparation of biochar: take wheat straw and expose it to the sun for 2 days, rinse it with distilled water for 3 times, and then dry it in an oven at 80°C for 8 hours. After drying, crush the wheat straw in a pulverizer. Wheat straw was placed in a tube furnace and heated to 400°C at a heating rate of 25°C / min, kept for carbonization for 1 hour, then heated to 500°C at a heating rate of 10°C / min, kept for carbonization for 3 hours, cooled to room temperature, and taken out. The carbonized wheat straw was ground in a grinder to a wheat straw biochar powder with an average particle size of 0.45 mm.

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Abstract

The invention discloses a method for treating common pollutants in an environment through combination of biochar and micro-plastics. The method comprises the following steps: S1, biochar preparation; s2, micro-plastic preparation; s3, mixing preparation: S3-1, pre-cooling treatment; s3-2, subzero treatment is carried out; and S3-3, carrying out freeze-drying preparation. S3-4, carrying out ultrasonic crushing; s4, combined application; and S5, recycling the micro-plastic. According to the method for treating the common pollutants in the environment through the combination of the biochar and the micro-plastic, the prepared biochar and the micro-plastic are compounded, the biochar-micro-plastic freeze-dried powder which is beneficial to application and convenient to recycle is obtained, and the good adsorption effect on various common pollutants in soil can be achieved.

Description

technical field [0001] The invention relates to the technical field of harmful pollutant treatment, in particular to a method for treating common pollutants in the environment by combining biochar with microplastics. Background technique [0002] Organic pollutants (such as polycyclic aromatic hydrocarbons PAHs), cationic pollutants (such as NH 4 + ) Heavy metal pollutants (such as Cu, Zn, Hg, Pb, etc.) are common pollutants in industry, agriculture, and food production, especially in industrial wastewater and domestic wastewater. The danger is also very great. Therefore, the treatment of the above-mentioned common pollutants in the environment is a problem that must be considered in the current social development. There are many ways to remove the above common pollutants, such as the ion exchange method for cationic pollutants NH 4 + Treatment of organic pollutants polycyclic aromatic hydrocarbons (PAHs) by adsorption method, using microbial or chemical methods to redu...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/06C09K17/40
CPCY02W10/10
Inventor 倪妮时仁勇王娜李晓娜宋洋郭欣妍张晓辉施玛丽
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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