A method of biochar combined with microplastics to treat common pollutants in the environment

A technology of microplastics and biochar, applied in sustainable biological treatment, restoration of polluted soil, chemical instruments and methods, etc., can solve the problems of interaction requiring further research, avoid secondary microplastic pollution, improve Flotation separation effect, good adsorption effect

Active Publication Date: 2022-06-07
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

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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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  • A method of biochar combined with microplastics to treat common pollutants in the environment

Examples

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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 0.3mm;

[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 th...

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 the environment with biochar combined with microplastics, comprising the following steps: S1, biochar preparation; S2, microplastic preparation; S3, mixed preparation: S3‑1, precooling treatment; S3‑ 2. Cryogenic treatment; S3-3, freeze-drying preparation; S3-4, ultrasonic pulverization; S4, compound application; S5, microplastic recovery. The method for treating common pollutants in the environment with biochar combined with microplastics of the present invention combines the prepared biochar and microplastics to obtain a biochar-microplastic freeze-dried powder that is beneficial to dispensing and convenient for recycling. All kinds of common pollutants can play a good adsorption effect.

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 hazards are 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 re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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