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A load-fixed chemical oxidation remediation method for composite contaminated soil

A technology of polluted soil and remediation method, which is applied in the field of chemical oxidation remediation of load-fixed composite polluted soil, and can solve the problems of difficult treatment effect, secondary pollution, complicated process and the like

Active Publication Date: 2020-10-20
HEBEI YUHUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many ways to deal with organic pollutants or heavy metal pollutants alone, but currently there are few methods that can effectively solve organic pollutants and heavy metal pollutants at the same time, and the process is complicated, so it is difficult to achieve the ideal treatment effect. Well, it is easy to cause secondary pollution

Method used

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  • A load-fixed chemical oxidation remediation method for composite contaminated soil
  • A load-fixed chemical oxidation remediation method for composite contaminated soil
  • A load-fixed chemical oxidation remediation method for composite contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A certain commercial land in Guangdong was polluted, the heavy metal pollutants of focus were copper, cadmium, lead, nickel, zinc, and the organic pollutants of focus were polycyclic aromatic hydrocarbons (phenanthrene, benzo(a)anthracene, benzo( b) Fluoranthene, benzo(a)pyrene, indeno(1,2,3-cd)pyrene, dibenzo(a,h)anthracene), petroleum hydrocarbons (C6-C16, C17-C36), xylene , to detect various indicators of the polluted commercial land, and the test results are shown in Table 1.

[0030] Excavate and sieve the detected contaminated soil, then divide it into four equal parts, and transport it to the curing, stabilization and restoration workshop for stabilization treatment;

[0031] The first contaminated soil is repaired by the chemical oxidation repair method of load-fixed compound contaminated soil, including the following steps:

[0032] (1) Screening and pre-processing the polluted soil to obtain screened polluted soil; said screening pre-processing removes coarse...

Embodiment 2

[0041] The second contaminated soil is repaired by chemical oxidation remediation method of load-fixed composite polluted soil, including the following steps:

[0042] (1) Screening and pre-processing the polluted soil to obtain screened polluted soil; said screening pre-processing removes coarse impurities with a particle size ≥ 50 mm, and polluted soil less than 50 mm is the polluted soil after screening;

[0043] (2) Add oxidizing agents to the sieved contaminated soil, mix well, and maintain in the restoration workshop for 3 days before testing; if figure 1As shown, the repair workshop includes an airtight greenhouse 4, the airtight greenhouse 4 is provided with an exhaust channel 5, the exhaust channel 5 is provided with an induced draft fan 6, and the exhaust channel 5 is connected to a bag filter 7, The bag filter 7 is connected to an activated carbon adsorption tank 8, and a detection port is arranged outside the activated carbon adsorption tank 8;

[0044] The additi...

Embodiment 3

[0051] The third contaminated soil is repaired by chemical oxidation remediation method of load-fixed composite contaminated soil, including the following steps:

[0052] (1) Screening and pre-processing the polluted soil to obtain screened polluted soil; said screening pre-processing removes coarse impurities with a particle size ≥ 50 mm, and polluted soil less than 50 mm is the polluted soil after screening;

[0053] (2) Add oxidizing agents to the sieved contaminated soil, mix well, and maintain in the restoration workshop for 7 days before testing; if figure 1 As shown, the repair workshop includes an airtight greenhouse 4, the airtight greenhouse 4 is provided with an exhaust channel 5, the exhaust channel 5 is provided with an induced draft fan 6, and the exhaust channel 5 is connected to a bag filter 7, The bag filter 7 is connected to an activated carbon adsorption tank 8, and a detection port is arranged outside the activated carbon adsorption tank 8;

[0054] The ad...

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Abstract

The invention relates to a load fixing type composite polluted soil chemical oxidization repairing method. The method comprises the following steps that firstly, polluted soil is subjected to screening pretreatment, and screened polluted soil is obtained; secondly, an oxidization agent is added in the screened polluted soil, and uniform mixing is conducted for repairing, wherein the adding volumeof the oxidization agent accounts for 0.1%-5% of the weight of the polluted soil, and the oxidization agent is a load fixing type oxidization agent; thirdly, a stabilization agent is added in the polluted soil which is continuously maintained for 3-7 days in the second step, uniform stirring is conducted, and the volume of the added stabilization agent accounts for 0.1%-3% of the weight of the heavy metal polluted soil obtained after screening treatment; fourthly, the polluted soil treated through the stabilization agent is subjected to stack beating and detection; and fifthly, the composite polluted soil which is detected to be qualified is backfilled to a planned backfilling area. By means of the load fixing type composite polluted soil chemical oxidization repairing method, organic matter and heavy metal mixing polluted soil can be repaired at the same time, the repairing effect is good, and the repairing method is simple.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a chemical oxidation restoration method for fixed-load composite polluted soil. Background technique [0002] Contaminated soil remediation refers to the use of physical, chemical, biological and ecological principles, and the use of artificial control measures to reduce the concentration (activity) of soil pollutants, realize the harmlessness and stabilization of pollutants, and achieve the desired detoxification effect. technical measures. At present, theoretically feasible restoration technologies include phytoremediation, microbial restoration, chemical restoration, physical restoration and comprehensive restoration. Some restoration techniques have entered the stage of field application and achieved good results. Remediation of contaminated soil is of great significance in blocking pollutants from entering the food chain, preventing harm to human health, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/00B09C1/08
Inventor 冯爱茜张弛刘星海段跃伟齐彩亚李玉会刘晓东
Owner HEBEI YUHUAN ENVIRONMENTAL PROTECTION TECH CO LTD