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Remediation device for contaminated soil

A technology of polluted soil and dosing pump, which is applied in the field of contaminated soil remediation, can solve the problems of limited selection of pollutants and excessive waste liquid produced by remediation, so as to prevent secondary pollution, improve work efficiency, and highly efficient waste liquid collection process Effect

Pending Publication Date: 2019-03-08
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of pollutant selection limitation and too much waste liquid produced by remediation in the current soil pollution remediation technology, the present invention provides a contaminated soil remediation device, which includes oxidation treatment equipment, and further optimizes the combination of oxidation treatment equipment and leaching treatment Equipment in one, can handle organic pollution and heavy metal polluted soil

Method used

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  • Remediation device for contaminated soil
  • Remediation device for contaminated soil

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Embodiment 1

[0039] Utilizing the soil oxidation treatment equipment provided by the present invention to oxidize the polluted soil collected from the polluted site, the amount of water and medicine can be flexibly dosed according to the actual situation of polluted soil, and different oxidants can be added according to different polluted soils. The basic physical and chemical properties of the soil are as follows: pH is 8.19, moisture content is 21.6%, and soil density is 2.04g cm -3 , the void ratio is 0.62, and the plasticity index is 12.0. The site soil is polluted by chlorophenol compounds such as 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP). In this embodiment, two Treatment: 1) Activation of Na 2 S 2 o 8 Treatment: apply Na 2 S 2 o 8 +CaO(1:1), the dosing order is CaO→Na 2 S 2 o 8 ;2) Fenton treatment area: apply H 2 o 2 +FeSO 4 ·7H 2 O+CA(1:1:1), first apply 30% H 2o 2 , and then apply part of CA, FeSO 4 ·7H 2 O solid, remaining CA, FeSO 4 ·7...

Embodiment 2

[0043] Using the soil oxidation treatment equipment and leaching treatment equipment provided by the present invention, the contaminated soil collected in the polluted site can be oxidized and leached respectively, and the polluted soil is affected by phenolic compounds and heavy metals arsenic (As), lead (Pb), cadmium ( Cd) Contamination. Oxidation remediation is carried out on the contaminated soil first, followed by leaching remediation. Oxidation treatment uses activated Na 2 S 2 o 8 For processing, the leaching solvent is selected from three kinds of hydrochloric acid, EDTA and citric acid. After oxidation repair, the removal rate of phenolic compounds in the soil is as high as 97%. After repeated leaching repairs, the elution efficiency of arsenic in contaminated soil can reach more than 60%, among which EDTA has the highest leaching efficiency of As (about 64%); citric acid has the most stable removal efficiency of As; During the leaching process, hydrochloric acid...

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Abstract

The invention relates to a remediation device for contaminated soil. The remediation device comprises oxidation treatment equipment. The oxidation treatment equipment comprises a water tank, a quantitative dosing pump, oxidant tanks, stirring equipment and a vacuum separator. A water outlet of the water tank is connected with the quantitative dosing pump. The output ends of the oxidant tanks are connected with the input end of the quantitative dosing pump. The output end of the quantitative dosing pump is connected with the input end of the stirring equipment. The vacuum separator comprises afirst space for containing materials in the stirring equipment and a second space which is in vacuum and is used for containing waste liquid. According to the remediation device for the contaminated soil, by arranging the quantitative dosing pump, the water in the water tank and an oxidant in the oxidant tanks can be quantitatively added to the stirring equipment, and the water quantity and the drug quantity can be flexibly adjusted according to actual requirements; the oxidant and pollutants are fully stirred in the stirring equipment so as to realize a complete oxidizing reaction; and afterthe reaction, the materials in the stirring equipment are moved to the vacuum separator for solid-liquid separation, so that secondary pollution caused by waste liquid is avoided, and soil remediationis realized.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a contaminated soil remediation device. Background technique [0002] Soil pollution means that the toxic and harmful substances in the soil exceed the self-purification ability of the soil, causing changes in the composition, structure and function of the soil. Harmful substances or their decomposition products gradually accumulate in the soil, and are absorbed by the human body through plants or water bodies, thereby endangering human health. Degree. [0003] Existing soil pollution control techniques are divided into chemical methods, physical methods and biological methods. Chemical methods generally include chemical leaching, chemical oxidation, and chemical dehalogenation techniques; physical methods generally include solidification / stabilization, gas phase extraction, thermodynamic restoration, vitrification, and guest soil / exchange technology; biolo...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08
Inventor 阎秀兰冯桐桐王金梅杨硕
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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