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Method for restoring polychlorinated biphenyl polluted site soil

A PCB and contaminated soil technology, applied in the restoration of contaminated soil, etc., can solve the problem of unsatisfactory restoration of PCB-contaminated soil and achieve effective restoration

Inactive Publication Date: 2016-02-03
天津环科立嘉环境修复科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the problem of unsatisfactory remediation of PCB-contaminated soil in the prior art, and provide a method for combined remediation of soil in PCB-contaminated sites by chemical treatment and biological treatment

Method used

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  • Method for restoring polychlorinated biphenyl polluted site soil
  • Method for restoring polychlorinated biphenyl polluted site soil
  • Method for restoring polychlorinated biphenyl polluted site soil

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The PCB-contaminated site was originally a dismantling site for electronic waste. During the dismantling process for many years, PCBs leaked and polluted the soil around the site. In the polluted area, PCB pollution is common in the 3m soil from the surface to the ground. The maximum concentration of PCBs in the contaminated soil is 68mg / kg, the minimum is 5mg / kg, and the average value is 43mg / kg. Treatment method Remediation of polluted soil.

[0059] Step 1) Synergistic elution:

[0060] In the in-situ restoration site, the injection, mixing and dosing plane design is carried out according to the machine model of the stirring and dosing pile. In this embodiment, a stirring pile leaf disc with a diameter of 700 mm is used, and the pile distance in each direction is 580 mm. For the position diagram of the pile hole of the stirring pile machine, see the attached figure 2 . According to the design drawings, use a total station to accurately locate and draw lines at th...

Embodiment 2

[0076] The PCB-contaminated site was originally a power capacitor storage site, which was limited by factors such as storage conditions and management levels, and the storage exceeded the design period. During the storage process, some waste capacitors were corroded, causing PCB leakage to pollute the surrounding area of ​​the storage site. soil, and will further threaten the health of surrounding residents and the ecological environment. In the polluted area, PCB pollution is common in the 30cm soil from the surface to the ground. The maximum concentration of PCBs in the contaminated soil is 206mg / kg, the minimum is 85mg / kg, and the average is 180mg / kg.

[0077] Step 1) Synergistic elution:

[0078] Build an ex-situ treatment workshop at the restoration site. The treatment workshop adopts a commercially available air-supported greenhouse. The air-supported greenhouse is an air shed formed by using an air pressure 0.2%-0.3% higher than the atmospheric pressure. There are pillars...

Embodiment 3

[0093] In the PCB polluted site, PCB pollution is common in the 5m soil from the surface to the ground in the contaminated area. The maximum concentration of PCBs in the contaminated soil is 146mg / kg, the minimum is 24mg / kg, and the average value is 108mg / kg. The in-situ treatment method was used to remediate the soil of the polluted site. For the specific method, refer to Example 1, wherein 50 L of synergistic eluent was added to each ton of contaminated soil, and the synergistic eluent was 1.5 mol / L sodium lauryl sulfate aqueous solution. Add 45mol of pure iron powder per ton of polluted soil, and the molar ratio of powdered activated carbon to pure iron powder is 1.5:3. Add 60L of oxidizing agent aqueous solution to each ton of polluted soil, and the oxidizing agent solution is 3mol / L hydrogen peroxide / potassium permanganate (molar ratio: 1:1) mixed solution. Add 1 kg of biological nutrients to each ton of contaminated soil. The carbon source of biological nutrients is ind...

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Abstract

The invention belongs to the field of the environmental engineering polluted site soil restoration, and particularly relates to a method for restoring polychlorinated biphenyl polluted site soil. The method comprises the following steps: synergistic elution, primary chemical treatment, secondary chemical treatment, anaerobic organism treatment and aerobic organism treatment. For the soil restoration problem of the real polychlorinated biphenyl polluted site, a restoration process combining the chemical treatment of chemical elution, acid regulation, zero-valent iron dechloridation, iron carbon micro-electrolysis, catalytic oxidation, biological anaerobic dechloridation and biological aerobic oxidation and biological treatment. Various effects such as chemical dechloridation (dechloridation effect of zero-valent iron), chemical oxidation (iron carbon micro-electrolytic effect of the zero-valent iron and active carbon and catalytic oxidation effect of oxidized medicine), biological anaerobic dechloridation effect and biological aerobic oxidation effect are reasonably integrated in one technology, so that the optimization of technology, economy, practicability and feasibility is realized.

Description

technical field [0001] The invention belongs to the field of soil restoration of environmental engineering polluted sites, and in particular relates to a method for soil restoration of polychlorinated biphenyl polluted sites. Background technique [0002] Polychlorinated biphenyls (PCBs) are a group of chlorinated aromatic hydrocarbon compounds with 209 homologues formed by chemically catalyzing the reaction by substituting 1 to 10 chlorine atoms for hydrogen on the biphenyl molecule at different positions. Its chemical expression is C 12 h 10-n Cl n . PCBs have excellent physical and chemical properties such as thermodynamic stability, chemical inertness, non-flammability, and high electrical resistivity. Toxicity and other characteristics can pose a great threat to organisms and human health through the transmission of the food chain. It has been banned and included in the first list of controlled pollutants in the Stockholm Convention on Persistent Organic Pollutants....

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/10
Inventor 游洋洋马建立张良运商晓甫乔鹏马云鹏郭红周金倩霍宁冯磊张诚王岳其他发明人请求不公开姓名
Owner 天津环科立嘉环境修复科技有限公司
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