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Method for remediating organic contaminated soil by combining chemical oxidation with microorganisms

A microbial remediation and organic pollution technology, which is applied in the field of chemical oxidation combined with microbial remediation of organic contaminated soil, can solve the problems of ecological environment safety risks, difficulty in maintaining activity of exogenous microorganisms, and restrictions on wide application, so as to reduce the consumption of oxidants and increase the quantity , cost-effective effect

Inactive Publication Date: 2020-11-13
HUATIAN ENG & TECH CORP MCC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mixed flora added by this method are exogenous microorganisms, which are generally difficult to maintain high activity in the soil environment, and there are potential ecological and environmental safety risks, and their wide application is strictly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The organic contaminated soil is crushed and passed through a 2mm sieve;

[0021] Treatment 1 Take 40g of dry weight contaminated soil, 0.2g of potassium persulfate, 0.02g of ferrous sulfate, mix well, and adjust the moisture content to 30%;

[0022] Treatment 2 Take 40g of dry weight contaminated soil, 0.1g of potassium persulfate, 0.01g of ferrous sulfate, mix well, and adjust the moisture content to 30%;

[0023] Treatment 3 Take 40g of dry weight contaminated soil, 0.1g of potassium persulfate, 0.01g of ferrous sulfate, 0.16g of potassium nitrate, 0.04g of potassium dihydrogen phosphate, and 5mL of bacterial agent, mix well, and adjust the moisture content to 30%.

[0024] After curing for 10 days, the soil moisture content was kept at 30%, and the temperature was 30°C. The concentration of organic pollutants in the soil was determined according to "Determination of Semivolatile Organic Compounds in Soil and Sediments by Gas Chromatography-Mass Spectrometry" (HJ 83...

Embodiment 2

[0027] The organic contaminated soil is crushed and passed through a 2mm sieve;

[0028] Treatment 1 Take 40g of dry weight contaminated soil, 0.1g of potassium persulfate, 0.1g of calcium peroxide, and 0.02g of ferrous sulfate, mix well, and adjust the moisture content to 40%;

[0029] Treatment 2 Take 40g of dry weight contaminated soil, 0.05g of potassium persulfate, 0.05g of calcium peroxide, and 0.01g of ferrous sulfate, mix well, and adjust the moisture content to 40%;

[0030] Treatment 3 Take 40g of dry weight contaminated soil, 0.05g of potassium persulfate, 0.05g of calcium peroxide, 0.01g of ferrous sulfate, 0.16g of potassium nitrate, 0.04g of potassium dihydrogen phosphate, and 5mL of bacterial agent, mix well, adjust Moisture content to 40%.

[0031] After curing for 10 days, the soil moisture content was kept at 40%, and the temperature was 30°C. The concentration of organic pollutants in the soil was determined according to "Determination of Semivolatile Orga...

Embodiment 3

[0034] The organic contaminated soil is crushed and passed through a 2mm sieve;

[0035] Treatment 1 Take 40g of dry weight contaminated soil, 0.2g of sodium persulfate, 0.02g of ferrous sulfate, mix well, and adjust the moisture content to 35%;

[0036] Treatment 2 Take 40g of dry weight contaminated soil, 0.1g of sodium persulfate, 0.01g of ferrous sulfate, mix well, and adjust the moisture content to 30%;

[0037] Treatment 3 Take 40g of dry weight contaminated soil, 0.1g of sodium persulfate, 0.01g of ferrous sulfate, 0.16g of potassium nitrate, 0.04g of potassium dihydrogen phosphate, and 5mL of bacterial agent, mix well, and adjust the moisture content to 30%.

[0038] After curing for 7 days, the soil moisture content was kept at 30%, and the temperature was 30°C. The concentration of organic pollutants in the soil was determined according to "Determination of Semivolatile Organic Compounds in Soil and Sediments by Gas Chromatography-Mass Spectrometry" (HJ 834-2017), a...

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PUM

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Abstract

The invention discloses a method for remedying organic contaminated soil by combining chemical oxidation with microorganisms. A microbial nutrient, an indigenous microbial agent and an oxidizing agentare evenly mixed with the organic contaminated soil, the oxidizing agent preferentially removes organic pollutants with high biological effectiveness in the soil, the biotoxicity of the organic pollutants is reduced, and the added microbial nutrient and indigenous microbial agent rapidly increase the number of organic pollutant degrading bacteria in the soil; and the removal efficiency of the organic pollutants is improved. Compared with the oxidation treatment of the organic contaminated soil by singly adding the oxidizing agent, the method has the advantages that the microbial removal rateof the organic pollutants is remarkably increased, the consumption of the oxidizing agent is greatly reduced, and the whole operation process is simple, economical, effective and suitable for variousorganic contaminated soil.

Description

technical field [0001] The invention relates to the technical field of organic polluted soil treatment, in particular to a method for chemical oxidation combined with microorganisms to remediate organic polluted soil. Background technique [0002] With the continuous advancement of urbanization, a large number of polluting enterprises in coking, chemical, petroleum and other industries have been shut down and relocated, resulting in a large number of organic polluted sites to be repaired. Chemical oxidation remediation technology uses oxidants to quickly remove organic pollutants in soil. It has the advantages of high remediation efficiency, short cycle, low cost, and insensitivity to pollutant types and concentrations. It is a commonly used remediation technology for organic polluted sites. However, the simple chemical oxidation repair agent has high input costs and there is a risk of secondary pollution to the environment. In view of the shortcomings in practical applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/10
Inventor 刘金光李明刘昀卢慧中
Owner HUATIAN ENG & TECH CORP MCC