A method for remediating heavy metals and organic pollutants in agricultural soil

A technology of organic pollutants and heavy metals, applied in the field of water treatment, can solve the problems of high cost, long cycle, and insufficient treatment depth, etc., and achieve the effects of enhanced oxidation, fast effect, and improvement of soil fertility

Active Publication Date: 2021-06-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have problems such as insufficient processing depth, long cycle, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A combined method of percarbonate-biochar for remediation of heavy metals and organic pollutants in agricultural soil:

[0027] (1) Wood was selected as the raw material of biochar, washed with water to remove the surface adherent substances, and then air-dried naturally. The air-dried material is crushed with a crusher, and a certain amount is placed in a crucible, isolated from the air, and placed in a pyrolysis furnace for 2 hours at a high temperature of 250°C to prepare biochar;

[0028] (2) Take 40g of pyrolyzed biochar and wrap it with mesh cloth with holes to make 2g / bag of biochar active filler, and place 20 bags of filler on 1m 3 in the soil to be repaired;

[0029] (3) Dissolve 2g of sodium percarbonate powder in 100mL of ultrapure water every day to make 20g / L of fresh percarbonate leachate, and add the forest filtrate to the soil sample by spraying;

[0030] (4) After continuous spraying of sodium percarbonate leachate for 15 days, the removal rates of fo...

Embodiment 2

[0032] A combined method of percarbonate-biochar for remediation of heavy metals and organic pollutants in agricultural soil:

[0033] (1) Bamboo is selected as the raw material of biochar, which is washed with water to remove the surface adherent substances and then air-dried naturally. The air-dried material was crushed by a crusher, and a certain amount was placed in a crucible, isolated from the air, and placed in a pyrolysis furnace at a high temperature of 450°C for 4 hours to prepare biochar.

[0034] (2) Take 160g of pyrolyzed biochar and wrap it with mesh cloth with holes to make 4g / bag of biochar active filler, and place 40 bags of filler in 1m 3 in the soil to be repaired.

[0035] (3) Dissolve 1g of sodium percarbonate powder in 50mL of ultrapure water every day to make 20g / L of fresh percarbonate leachate, and add the forest filtrate to the soil sample by spraying;

[0036] (4) After continuous spraying of sodium percarbonate leachate for 20 days, the removal ra...

Embodiment 3

[0038] A combined method of percarbonate-biochar for remediation of heavy metals and organic pollutants in agricultural soil:

[0039] (1) Straw was selected as the raw material of biochar, washed with water to remove the surface adherent substances, and then air-dried naturally. The air-dried material is crushed with a crusher, and a certain amount is placed in a crucible, isolated from the air, and placed in a pyrolysis furnace at a high temperature of 550 ° C for 4 hours to prepare biochar;

[0040] (2) Take 120g of pyrolyzed biochar and wrap it with mesh cloth with holes to make 4g / bag of biochar active filler, and place 30 bags of filler on 1m 3 in the soil to be repaired;

[0041] (3) Dissolve 3g of potassium percarbonate powder in 100mL of ultrapure water every day to make 30g / L of fresh percarbonate leachate, and add the forest filtrate to the soil sample by spraying;

[0042] (4) After continuous spraying of potassium percarbonate leachate for 30 days, the removal r...

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PUM

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Abstract

The invention discloses a method for repairing heavy metals and organic pollutants in agricultural soil, which is characterized in that the raw material of biochar is washed with water to remove surface adhering substances and then naturally air-dried; after the air-dried biomass is broken, the Pyrolysis in the medium; the pyrolyzed biochar is wrapped with a plastic mesh cloth with holes to form a biochar active filler, which is buried in the soil to be repaired; the percarbonate is dissolved in water to prepare Form a percarbonate leachate, periodically wash the soil to be repaired, and finally achieve the purpose of removing heavy metals and organic pollutants in the soil after combined treatment with biochar and percarbonate. The invention has low cost, easy access to raw materials, long action time and wide applicable pH range, can improve soil fertility in addition to remediating soil heavy metals and organic pollutants, and is suitable for remediating polluted agricultural soil.

Description

technical field [0001] The invention relates to a method for removing heavy metals and organic pollutants in soil, in particular to a method for combined use of percarbonate and biochar to repair heavy metals and organic matter in soil, and belongs to the technical field of water treatment. Background technique [0002] With the massive development and utilization of mineral resources and the rapid development of industrial production, various heavy metal pollutants enter the environment through different channels, causing soil, especially farmland soil pollution, to continue to aggravate. In order to meet the national soil environmental quality standards (secondary standards: Cd≤0.3mg / kg; Pb≤300mg / kg; Ni≤50mg / kg), it is urgent to treat the soil up to the standard. [0003] The existing treatment technologies mainly include phytoremediation, physical engineering restoration and chemical restoration. By applying alkaline substances such as lime to the soil polluted by Cd, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/00A01B79/02
CPCA01B79/02B09C1/00B09C1/08
Inventor 薛罡袁健钱雅洁李贤英陈红高品李响刘振鸿李前
Owner DONGHUA UNIV
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