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Method for repairing heavy metal 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, insufficient treatment depth, long cycle, etc., and achieve the effect of enhancing oxidation, improving soil fertility, and quick effect

Active Publication Date: 2018-10-19
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 method for combined percarbonate-biochar 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 surface adhering 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 a 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 four he...

Embodiment 2

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

[0033] (1) Bamboo was selected as the raw material of biochar, washed with water to remove surface adhering 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 on 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 rates of four he...

Embodiment 3

[0038] A method for combined percarbonate-biochar 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 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 a 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) 3g potassium percarbonate powder is dissolved in 100mL ultrapure water every day to make fresh percarbonate leachate of 30g / L, and the forest filtrate is added in the soil sample by spraying;

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

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PUM

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Abstract

The invention discloses a method for repairing heavy metal and organic pollutants in agricultural soil. The method is characterized in that charcoal raw materials are washed, surface coherent substances are removed, and natural air drying is carried out; the biomass subject to air drying is broken, and is subject to pyrolysis in a pyrolyzing furnace; the charcoal subject to pyrolysis is wrapped byplastic mesh fabric with meshes to be formed, charcoal active filler is made, and soil to be repaired is filled with the padding; percarbonate is dissolved in water, percarbonate leachate is prepared, soil to be repaired is leached at regular periods, and after combined treatment of charcoal and percarbonate, the aim of removing the heavy metal and the organic pollutants is finally achieved. Thecost is low, raw materials are easily obtained, the action time is long, the applicable pH range is wide, the heavy metal and the organic pollutants are removed, soil fertility can be improved, and the method is suitable for repairing of the 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 on the soil polluted by Cd, th...

Claims

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Application Information

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Patent Type & Authority Applications(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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