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Repairing method capable of reducing total amount of heavy metal in soil

A remediation method and heavy metal technology, applied in the restoration of contaminated soil, etc., to achieve the effect of improving removal efficiency and high action efficiency

Active Publication Date: 2018-01-30
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Regardless of the above methods, there are certain limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A soil remediation method capable of reducing the total amount of heavy metals in soil, comprising the following steps:

[0020] 1) Apply the activator to the soil at a volume ratio of 1 to 3:1 to the soil, keep the soil moisture content greater than 45%, mix and stir to remove heavy metals from the soil particles, and the components of the activator include biosurfactants and solubilizers;

[0021] 2) Add the porous material to the soil at a volume ratio of 2:1 to 1:3, mix and stir, so that the metal elements are adsorbed to the surface of the porous material, and the iron content in the composition of the porous material is greater than 5%;

[0022] 3) Separation of porous material from soil by sieving or magnetic separation.

[0023] 4) The porous material obtained after separation in step 3) can be regenerated and recycled through acid leaching or soaking treatment; the acid used in acid rinsing is any one of hydrochloric acid, acetic acid, nitric acid, and sulfuri...

Embodiment 2

[0027] This embodiment is an improvement made on the basis of Embodiment 1. For the same part as Embodiment 1 in this embodiment, please refer to the content disclosed in Embodiment 1 for understanding, and the content disclosed in Embodiment 1 should also be used as this embodiment. The content of the example will not be repeated here.

[0028] The content of Cd and Pb in the soil of the site is 265.75mg / kg and 5912.5mg / kg respectively. Add the activator to the soil at a volume ratio of 2:1 (the surfactant in the activator is composed of glycolipid, lignin, soybean oil and water; the total amount of glycolipid, lignin, and soybean oil accounts for 0.05% of the activator. %), make the soil wet, stir for 30 minutes, add the porous material at a volume ratio of 1:2 to the soil, mix, stir again, 30 minutes, sieve, and take the soil for testing. The contents of Cd and Pb in the surfactant were 103.3 mg / kg and 3345.2 mg / kg respectively, and the total amount of Cd and Pb in the soi...

Embodiment 3

[0030] This embodiment is an improvement made on the basis of Embodiment 1. For the same part as Embodiment 1 in this embodiment, please refer to the content disclosed in Embodiment 1 for understanding, and the content disclosed in Embodiment 1 should also be used as this embodiment. The content of the example will not be repeated here.

[0031] The contents of Cu, Zn and As in the soil were 2248.75 mg / kg, 27475 mg / kg and 948.25 mg / kg, respectively. Take 10ml of activator (the activator contains 20% phosphoric acid, 0.1% phytic acid, 0.01% glycolipid), add it to 10g soil, stir, and mix the solid porous material (in the porous material: 85% iron-based material, 2% carbon, carbonic acid Ammonium hydrogen 10%, polyvinyl alcohol 3%) was added to the soil at a volume ratio of 1:1 to the soil, stirred for 20 minutes, and the porous material was taken out through magnetic separation, and the soil was tested, and the Cu, Zn and As contents were 1039.5 mg / kg, 13185mg / kg and 381mg / kg, ...

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Abstract

The invention discloses a repairing method capable of reducing total amount of heavy metal in soil. The method comprises the following steps: applying an activating agent containing a surfactant to soil according to the volume ratio of the activating agent to the soil being (1 to 3) to 1 so as to separate the heavy metal from the soil particles; adding a porous material into the soil according tothe volume ratio of the porous material to the soil being between (2 to 1) to (1 to 3), mixing and stirring, so that metal elements are adsorbed to the surface of the porous material; and separating the porous material and the soil through sieving or magnetic separation. By the repairing method, lead, cadmium, arsenic, zinc, cobalt, chromium and the like existing in the soil or sludge can be reduced or removed at one time, and the risk that the heavy metal is released again caused by the change of the soil environment can be avoided.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to the field of removal of heavy metals in soil, transfer of heavy metals in solid repair materials, and separation of attached heavy metal materials, and in particular to a repair method capable of reducing the total amount of heavy metals in soil. Background technique [0002] Heavy metals in soil are non-degradable and accumulative. At present, heavy metal restoration in soil mostly adopts solidification / stabilization technology, which is to apply chemical agents or physical adsorbents to the soil, and reduce metal mobility and bioavailability. The purpose of reducing the harm to living organisms. However, heavy metals in the soil have not been reduced or removed. When environmental conditions change, such as changes in soil pH, the solidified / stabilized heavy metals will be released again, endangering the health of animals, plants and humans. The treatment meth...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 刘俐
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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