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Method for repairing organic pollutants in farmland soil through combination of biochar and biodegradation

A technology of organic pollutants and combined biology, applied in the field of organic pollutant treatment, can solve problems such as limited application range, and achieve the effects of improving treatment effect, promoting anaerobic degradation, and promoting adsorption capacity

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, this invention patent does not involve the adsorption and degradation of organic pollutants such as polycyclic aromatic hydrocarbons (PAHs) in the soil. The application range is not wide and further improvement is needed.

Method used

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  • Method for repairing organic pollutants in farmland soil through combination of biochar and biodegradation
  • Method for repairing organic pollutants in farmland soil through combination of biochar and biodegradation
  • Method for repairing organic pollutants in farmland soil through combination of biochar and biodegradation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for biochar combined with biodegradation to restore organic pollutants in farmland soil, comprising the following steps:

[0036] S1. Preparation of corn stalk biochar: take corn stalks and expose them to the sun for 2 days, rinse them with distilled water for 3 times, and dry them in an oven for 8 hours at a temperature of 75°C. Use a pulverizer to crush them and pass them through a 70-mesh sieve. , Put the corn stalk powder in a tube furnace and heat it to 200°C at a heating rate of 13°C / min, keep it warm for 1h, then heat it to 300°C at a heating rate of 20°C / min, hold it for 2.5h, and cool to room temperature Finally, take it out, and use deionized water to rinse 3 times to obtain corn stalk biochar CB300;

[0037] S2. Bamboo charcoal preparation: wild alpine bamboo charcoal with a growth year of 4 years was naturally air-dried for 3 days, soaked in a biomass degradation solution for 18 hours, and the mass ratio of wild alpine bamboo to biomass degradation ...

Embodiment 2

[0047] This example is basically the same as Example 1, except that the preparation method of the corn stalk biochar in step S1 is different.

[0048] S1. Preparation of corn stalk biochar: take corn stalks and expose them to the sun for 2 days, rinse them with distilled water for 3 times, dry them in an oven for 6 hours at 70°C, crush them with a pulverizer, and then sieve them through a 60-mesh sieve. , Put the corn stalk powder in a tube furnace and heat it to 200°C at a heating rate of 10°C / min, hold it for 1 hour, then heat it at a heating rate of 20°C / min to 300°C, hold it for 2 hours, and cool it to room temperature Take it out, rinse with deionized water 3 times, and obtain corn stalk biochar CB300.

Embodiment 3

[0050] This example is basically the same as Example 1, except that the preparation method of the corn stalk biochar in step S1 is different.

[0051] S1. Preparation of corn stalk biochar: take corn stalks and expose them to the sun for 2 days, wash them with distilled water for 3 times, dry them in an oven for 10 hours at 80°C, crush them with a pulverizer, and then sieve them through an 80-mesh sieve. , Put the corn stalk powder in a tube furnace and heat it to 200°C at a heating rate of 15°C / min, hold it for 1 hour, then heat it at a heating rate of 20°C / min to 300°C, hold it for 3 hours, and cool it to room temperature Take it out, rinse with deionized water 3 times, and obtain corn stalk biochar CB300.

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Abstract

The invention discloses a method for repairing organic pollutants in farmland soil through combination of biochar and biodegradation. The method comprises the following steps: S1, preparing corn straw biomass charcoal; s2, preparing bamboo charcoal; the method comprises the following steps: S2-1, sampling, S2-2, primary treatment, S2-3, secondary treatment, S2-4, pyrolysis and S2-5, preparation compounding. S3, applying the corn straw biomass charcoal CB300 and the bamboo charcoal BB700 for the first time; s3-1, primary treatment, S3-2, extraction water treatment, S3-3, secondary treatment, and S3-4, circulation; s4, applying the microbial nutrient solution for the second time; according to the method, migration and accumulation of the PAHs from the waterlogged soil to the rice body can be effectively prevented and controlled, low-molecular-weight organic acid mainly secreted by the rice root system under the stress of the PAHs can promote dissolution of DOC more easily, meanwhile, anaerobic degradation of soil microorganisms in the waterlogged soil on the PAHs is promoted, the bamboo charcoal is mainly used for inhibiting reduction of the PAHs in the soil by adsorbing and fixing pollutants, and the effect of preventing the PAHs in the waterlogged soil is achieved. The bioavailability is reduced, so that the blocking and controlling effects on pollutants are improved.

Description

technical field [0001] The invention relates to the technical field of organic pollutant treatment, in particular to a method for biochar combined with biodegradation to restore organic pollutants in farmland soil. Background technique [0002] Organic pollutants refer to pollutants composed of natural organic substances in the form of carbohydrates, proteins, amino acids, and fats, and some other biodegradable synthetic organic substances. It can be divided into two categories: natural organic pollutants and synthetic organic pollutants. Polycyclic aromatic hydrocarbons (PAHs) are a kind of organic pollutants, which are divided into natural sources and man-made sources. Natural sources mainly come from the biosynthesis process of land, aquatic plants and microorganisms. In addition, natural fires in forests and grasslands and volcanic eruptions and PAHs are also present from fossil fuels, lignin, and sediments; anthropogenic sources are mainly from incomplete combustion of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B09C1/08B09C1/10B09C1/00
CPCY02W10/37
Inventor 倪妮时仁勇万春云王娜宋洋何健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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