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Method of repairing agricultural soil by calcium peroxide-charcoal

A calcium peroxide and biochar technology, applied in the field of water treatment, can solve the problems of secondary pollution of soil and groundwater, changes in soil physicochemical properties, and expensive eluents, etc., to improve the effect of bioremediation, increase soil organic matter, improve Effects of chemical oxidation effects

Inactive Publication Date: 2018-08-14
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrodynamic remediation technology can easily lead to changes in soil physical and chemical properties; leaching agents are expensive, and elution waste liquid may cause secondary pollution of soil and groundwater; stabilization / solidification technology is not a permanent remediation measure, but only changes the existing form of heavy metals. Heavy metal elements remain in the soil and are easily reactivated to cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method of calcium peroxide-biochar restoration of agricultural soil:

[0031] (1) Straw was selected as the raw material of biochar, and the material adhered to the surface of the straw was removed by washing with water, and then air-dried naturally. Use a crusher to crush the air-dried straw, take a certain amount of crushed dry matter and place it in a crucible, wrap the surface with aluminum foil to isolate the air, and place it in a pyrolysis furnace for 2 hours at a high temperature of 200 °C Prepared into biochar;

[0032] (2) Take 30g of the pyrolyzed biochar and wrap it with a plastic mesh cloth with apertures to make 1.5g / bag of biochar active filler, and place 20 bags of filler on 1 m 3 in the soil to be repaired;

[0033] (4) Dissolve 1.5g calcium peroxide powder in 100mL water every day to make fresh calcium peroxide leachate of 15g / L, and add the leachate to the soil sample by spraying;

[0034] (5) After continuous spraying of calcium peroxide leachate ...

Embodiment 2

[0036] A method of calcium peroxide-biochar restoration of agricultural soil:

[0037] (1) Rice straw was selected as the raw material of biochar, and the substances adhering to the surface of the rice straw were removed by washing with water, and then air-dried naturally. Use a crusher to crush the air-dried straw, take a certain amount of crushed dry matter and place it in a crucible, wrap the surface with aluminum foil to isolate the air, and place it in a pyrolysis furnace for 2 hours at a high temperature of 350 °C Prepared into biochar;

[0038] (2) Take 180g of the pyrolyzed biochar and wrap it with a plastic mesh cloth with apertures to form a 5g / bag biochar active filler, and place 36 packs of filler on 1 m 3 in the soil to be repaired;

[0039] (4) Dissolve 0.75g of calcium peroxide powder in 50mL of water every day to make fresh calcium peroxide leachate of 15g / L, and add the leachate to the soil sample by spraying;

[0040] (5) After continuous spraying of calci...

Embodiment 3

[0042] A method of calcium peroxide-biochar restoration of agricultural soil:

[0043] (1) Fruit tree branches are selected as biochar raw materials, and the substances adhered to the surface of the fruit tree branches are removed by washing with water, and then air-dried naturally. Use a crusher to crush the air-dried fruit tree branches, take a certain amount of crushed dry matter and place it in a crucible, wrap the surface with aluminum foil to isolate the air, and place it in a pyrolysis furnace for pyrolysis at a high temperature of 500°C 4h prepared into biochar;

[0044] (2) Take 100g of the pyrolyzed biochar and wrap it with a plastic net-woven cloth with holes to make 5g / bag of biochar active filler, and place 20 packs of filler on 1 m 3 in the soil to be repaired;

[0045] (4) Dissolve 1.5g calcium peroxide powder in 100mL water every day to make fresh calcium peroxide leachate of 15g / L, and add the leachate to the soil sample by spraying;

[0046] (5) After cont...

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Abstract

The invention discloses a method of repairing agricultural soil by calcium peroxide-charcoal. The method of repairing the agricultural soil by the calcium peroxide-charcoal is characterized in that acharcoal raw material is washed to remove materials adhering on the surface and then dried naturally, and then broken; the broken charcoal is put in a pyrolyzing furnace for sealing and pyrolyzation;the charcoal after pyrolyzation is wrapped and formed by plastic mesh fabrics with pore diameters, and an active filler of charcoal is made and placed in the soil to be repaired; the calcium peroxideis dissolved in water, the pH value of the calcium peroxide is adjusted, leachate of the calcium peroxide is prepared to spray the soil to be repaired regularly, and the purpose of removing heavy metals and organic pollutants in the soil is finally achieved by combined treatment of the charcoal and the calcium peroxide. The method of repairing the agricultural soil by the calcium peroxide-charcoalis low in cost, the raw materials are easy to obtain, action time is long, the applicable pH range is wide, the heavy metals and the organic pollutants in the soil can be repaired, the soil fertilitycan be improved, and the method of repairing agricultural soil by calcium peroxide-charcoal is suitable for remediation of contaminated 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 combining calcium peroxide 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. Intensified. The heavy metal pollution in my country's agricultural soil generally presents a trend of intensified pollution, enlarged polluted area, and diversified development of pollution sources. Heavy metals that cause soil pollution mainly include elements with significant biological toxicity such as mercury, nickel, cadmium, lead, and metalloid arsenic, as well as zinc, copper, and cobalt that are somewhat to...

Claims

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Application Information

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IPC IPC(8): B09C1/08A01B79/02
CPCA01B79/02B09C1/08
Inventor 钱雅洁袁健薛罡李贤英高品陈红李响刘振鸿李前
Owner DONGHUA UNIV
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