Method for repairing organic-heavy metal composite contaminated soil by coupling chemical oxidation with biochar enhanced microorganisms

A technology of microbial remediation and oxidation coupling, applied in the field of enhanced remediation of organic-heavy metal compound polluted soil, can solve the problems of pollutants that are difficult to completely remove oxidant ecological risks, compound pollution, etc., to solve ecological risk problems, promote complete removal, and ensure restoration efficiency effect

Inactive Publication Date: 2020-12-25
ZHEJIANG METALLURGICAL RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the embodiments of the present invention is to provide a method for chemical oxidation coupled with biochar to strengthen microorganisms to remediate organic-heavy metal compound polluted soil, so as to solve the problem of compound pollution in related technologies, and the oxidants that are difficult to completely remove pollutants and remain in the soil ecological risk

Method used

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  • Method for repairing organic-heavy metal composite contaminated soil by coupling chemical oxidation with biochar enhanced microorganisms
  • Method for repairing organic-heavy metal composite contaminated soil by coupling chemical oxidation with biochar enhanced microorganisms
  • Method for repairing organic-heavy metal composite contaminated soil by coupling chemical oxidation with biochar enhanced microorganisms

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, this example provides a method for chemical oxidation coupled with biochar to strengthen microbial remediation of organic-heavy metal compound polluted soil, using ectopic remediation, including the following steps:

[0029] Step S100: Rinse: crush 100kg of soil with a mixing cutter, send it to a drum stone washing machine, remove stones and coarse sand larger than 4mm, and send it to the leaching tank (using a large stainless steel + resin tank) , add water in different proportions (1:3, 1:4, 1:5 volume ratio), adjust the pH to 5, add sodium persulfate powder to make the concentration of sodium persulfate in the reaction tank 0.5 ~ 0.8mM, add sulfuric acid Ferrous and biochar powder activated potassium persulfate, the dosage ratio is as follows, or the method of activation by ultraviolet light irradiation, stirring vigorously (200-300r / min) for 30 minutes, then stirring at a stirring rate of 100-150r / min for 15 minutes Minutes stand.

[003...

Embodiment 2

[0042] Step S100 is the same as that in Embodiment 1, and will not be repeated here.

[0043] Step S101: Use an acid-resistant filter press to filter the soil-water mixed liquid in step S100, and the final dehydration efficiency reaches 85%. The filtered water is introduced into the reaction pool through the conduit. Collect the mud cake, and pile it into the soil stacking reaction tank after the quality reaches 100kg.

[0044] Step S102, spraying biochar powder in the soil reactor tank, the dosage is 0.1g / kg (biochar / soil) dosage ratio, keep the soil moisture content above 60%, adjust the pH of the pile soil to be 7, the pile body The temperature is 37 degrees Celsius, and the soil is piled up for 14 days.

[0045] Step S103, soil pile acceptance: the unqualified soil returns to step S100 or step S101 until the repair is qualified, and the repair is completed.

[0046] Also includes the following steps:

[0047] Step S104, place the eluate separated in step S101 in advanc...

Embodiment 3

[0050] Step S100 is the same as that in Embodiment 1, and will not be repeated here.

[0051] Step S101: Use an acid-resistant filter press to filter the soil-water mixed liquid in step S100, and the final dehydration efficiency reaches 85%. The filtered water is introduced into the reaction pool through the conduit. Collect the mud cake, and pile it into the soil stacking reaction tank after the quality reaches 100kg.

[0052] Step S102, spray biochar powder in the soil reactor tank, the dosage is 0.5g / kg (biochar / soil) dosage ratio, keep the soil moisture content more than 60%, adjust the pH of the pile soil to be 7, the pile body The temperature is 37 degrees Celsius, and the soil is piled up for 14 days.

[0053] Step S103, soil pile acceptance: the unqualified soil returns to step S100 or step S101 until the repair is qualified, and the repair is completed.

[0054] Also includes the following steps:

[0055] Step S104, place the eluate separated in step S101 in advan...

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Abstract

The invention discloses a method for repairing organic-heavy metal composite contaminated soil by coupling chemical oxidation with biochar enhanced microorganisms. The method comprises the following steps of: crushing to-be-remediated soil, carrying out wet screening until the particle size is less than 4mm, adjusting the soil-water ratio of a soil aqueous solution to 1: 3-1: 5, adjusting the pH value to 5, adding a sodium persulfate solution activated by charcoal, carrying out leaching treatment, oxidizing organic pollutants by sodium persulfate while leaching, and transferring heavy metal pollutants from the soil to the aqueous solution; after the soil and water are separated by dehydration equipment, treating liquid by advanced oxidation equipment, further oxidizing organic pollutants,adjusting the pH value of heavy metals to 9-10, and enabling the heavy metals to reach the standard after coagulation and precipitation; recycling the treated aqueous solution for soil leaching in theprevious step; and adding the charcoal into the separated soil, uniformly mixing, stacking, keeping ventilation, further oxidizing residual organic matters in the soil, slowly releasing the heavy metals, and increasing the microbial activity of the soil until the contaminated soil reaches the standard.

Description

technical field [0001] The invention relates to the field of enhanced remediation of organic-heavy metal compound polluted soil, in particular to a method for chemical oxidation coupled with biochar to strengthen microorganism remediation of organic-heavy metal compound polluted soil. Background technique [0002] Soil is a system composed of multi-media and multi-interface. With the rapid development of industrial and agricultural production, the pollutants entering the soil are increasing day by day. These pollutants mainly include organic pesticides, polycyclic aromatic hydrocarbons, polychlorinated biphenyls and heavy metals. A variety of pollutants are discharged into the soil at the same time or successively, making the phenomenon of compound soil pollution very common. [0003] Currently, for single pollutants, such as organically polluted sites / soils, remediation technologies are abundant, mainly including physical, chemical, biological and combined remediation tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10B09C1/02
CPCB09C1/08B09C1/10B09C1/02
Inventor 王凌文殷操俞河蔡巧兰郑雄柳
Owner ZHEJIANG METALLURGICAL RES INST
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