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A kind of chromium polluted soil remediation improving agent and its remediation method

A technology of chromium-contaminated soil and improver, which is applied in the field of soil remediation, can solve the problems of soil impact on sustainable utilization, etc., and achieve the effect of improving passivation repair effect, removal rate and generation rate

Active Publication Date: 2019-08-09
INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies in the prior art, the present invention provides a chromium-contaminated soil remediation improver, which can treat highly toxic Cr 6+ Reduction, while the reduced Cr 3+ Fixing is used to solve the problem that the soil is affected by chromium pollution and its sustainable utilization

Method used

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  • A kind of chromium polluted soil remediation improving agent and its remediation method
  • A kind of chromium polluted soil remediation improving agent and its remediation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A chromium-contaminated soil remediation improver, the soil composite improver is composed of the following raw materials in weight percentage: 20% ferrous sulfate, 20% calcium polysulfide, 20% humic acid resin, 20% cow dung, 20% bacterial residue .

[0039] Humic acid resin is obtained by the following method: Take sodium sulfonated humate and grind it, pass through a 80-120 mesh sieve, and mix the crushed sodium sulfonated humate with phenolic resin and hydrochloric acid with a concentration of 37wt% in a ratio of 1:2:1 After mixing evenly, cross-link and solidify at 260°C for 4 hours, wash with water until colorless, dry at 60°C for 7 hours, grind, and sieve. The particle size after sieving is ≤0.25mm, and then the obtained The crude humic acid resin was soaked in a calcium acetate solution with a concentration of 2mol / L for 5 hours, filtered, washed, and dried at 60°C for 7 hours.

[0040] The method for remediating chromium-contaminated soil by using the chromium-...

Embodiment 2

[0047] A chromium-contaminated soil repair and improver, the soil composite improver is composed of the following raw materials in weight percentage: 10% ferrous sulfate, 10% calcium polysulfide, 30% humic acid resin, 25% cow dung, 25% bacterial residue .

[0048] The preparation method of humic acid resin is the same as embodiment 1.

[0049] The method for remediating chromium-contaminated soil by using the chromium-contaminated soil remediation improver, the steps are as follows:

[0050] (1) Take the chromium-contaminated soil and crush it to a particle size below 2 mm;

[0051] (2) Take ferrous sulfate (FeSO 4 ) and calcium polysulfide (CPS) are evenly mixed with the crushed chromium-contaminated soil to obtain the chromium-contaminated soil mixture; ferrous sulfate (FeSO 4 ) and the mass ratio of chromium-contaminated soil is 1:15;

[0052] (3) adding water to adjust the water content of the chromium-contaminated soil mixture is 28wt%, stirring for 8 minutes;

[005...

experiment example

[0063] Experimental example: the application of the composite improver of the present invention in the remediation of chromium-contaminated soil and the growth of crops

[0064] 1. Test overview

[0065] 1.1. Test site: Chromium-contaminated soil was taken from Jiyang. The basic physical and chemical properties are as follows: pH is 7.83, organic matter content is 9.14g / kg, alkaline nitrogen content is 21.36mg / kg, available phosphorus content is 30.08mg / kg, available Potassium content is 170mg / kg, Cr 6+ The content is 95mg / kg. The tested crops were purslane, rapeseed and ryegrass.

[0066] 1.2. Test settings

[0067] 1.2.1 Restoration test: The chromium-contaminated soil was repaired according to the method in Example 1.

[0068] 1.2.2 Pot test: 4 treatments (table 1) are set in the test, which are respectively control (unrepaired soil), treatment 1 (embodiment 1), treatment 2 (embodiment 2), treatment 3 (comparative example), each Treatments were repeated 4 times.

[00...

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Abstract

The invention relates to a remediation conditioner for chromium-contaminated soil and a remediation method adopting the remediation conditioner. The remediation conditioner comprises raw materials in percentage by weight as follows: 5%-25% of ferrous sulfate, 5%-25% of calcium polysulphide, 5%-30% of humic acid resin, 1%-2% of cow dung and 1%-25% of fungus residues, wherein the humic acid resin is prepared from sulfonated sodium humate, phenol-formaldehyde resin and calcium acetate through activation after crosslinking and curing. The remediation conditioner adopts a simple formula, is mainly used for remediating soil by removing chromium, has high chromium VI removal rate, can increase content of residual-form chromium, can improve the soil quality and improves the sustainable utilization capacity of the soil.

Description

technical field [0001] The invention relates to a chromium-contaminated soil repair improving agent and a repair method thereof, belonging to the technical field of soil repair. Background technique [0002] As important industrial raw materials, chromium and chromium salts are widely used in metallurgy, tanning, textile, pharmaceutical, electroplating and other industries, and play an important role in the construction of the national economy. However, a large amount of chromium-containing wastewater and waste gas are also produced. Among them, atmospheric chromium-containing pollutants enter the soil through precipitation and sedimentation, and chromium-containing pollutants in water enter the soil through sewage drainage and irrigation. According to statistics, since the middle of the 20th century, more than 6 million tons of chromium slag have been accumulated in my country for many years, of which more than 4 million tons have not been effectively disposed of, and the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08C09K101/00
CPCB09C1/08B09C2101/00C09K17/40C09K2101/00
Inventor 薄录吉李彦刘兆辉井永苹耿立清罗加法
Owner INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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