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In-situ chemical restoration method for soil

A chemical repair and in-situ technology, applied in the restoration of contaminated soil, etc., can solve the problems of unsuitable cultivated land restoration, high cost, labor and time-consuming, etc., and achieve ideal decomposition effect, low construction cost, and reduce absorption.

Inactive Publication Date: 2014-10-29
张家口市绿洁环保技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These high-temperature incineration treatment methods are not only costly, but also labor-intensive and time-consuming, and are not suitable for the restoration of cultivated land

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example is to remediate the water body polluted by deltamethrin.

[0028] Deltamethrin was successfully developed in the 1980s, and it is also one of the fastest growing insecticides in the world, belonging to polycyclic aromatic hydrocarbons.

[0029] at 100m 3 In the sewage pool, 10L of water sample was taken. Considering that there are more sludge at the bottom and edge of the pool, 10 grams of sludge was taken and put into 10L of sewage. The measured deltamethrin pollution concentration reached 100μg / L.

[0030] First of all, we choose the application concentration in the laboratory, and put 50 grams of chlorine dioxide powder (ClO 2 content 6%) was dissolved in 1000ml of water, and reacted for 5 minutes to obtain 1000ml of chlorine dioxide mother liquor with a concentration of 3000mg / L. Take 5ml of mother liquor with a straw and put it into 10L of sewage. The concentration of chlorine dioxide is 1.5mg / L. After 20 minutes of action, the concentration of de...

Embodiment 2

[0034] This example is to remediate the soil contaminated by deltamethrin.

[0035] We took about 2,000 grams of soil samples in a 0.7-acre leek greenhouse and tested them. The deltamethrin content was 3.2 mg / kg, and the pollution depth reached 40 cm. We calculate the volume of pollution (667M 2 X0.7X0.4) about 186.76M 3 , and calculated water consumption (16 tons X0.7) is about 11.2 tons of water.

[0036]We used 50mg / L, 60mg / L, and 70mg / L concentrations to conduct decomposition tests in the laboratory, and the residual results after decomposition were 53μg / L, 32μg / L, and 28μg / L. Therefore, it is determined that the amount of chlorine dioxide consumed per unit volume of polluted soil is 60mg / L. After calculation: use 12 kg of chlorine dioxide powder with a content of 6%, 12000×6% (content)=720 grams=720000mg, put it into 12 tons of water (12000 L), and the concentration is 60mg / L. Prepare 12 barrels of mother liquor (20 kg per barrel, concentration 3000 mg / L), totaling 24...

Embodiment 3

[0038] This example remediates soil contaminated by dicofol and hexachlorobenzene.

[0039] We took 4,000 grams of soil samples from the former site of a pesticide factory. The test results showed that the content of dicofol was 3.4mg / kg and the content of hexachlorobenzene was 8.2mg / kg. Similarly, we also use 60mg / L and 80mg / L for field operations to observe the actual effect.

[0040] We first planned two contaminated sites of 10 meters by 5 meters, and dug them to a depth of 0.5 meters with an excavator (each volume is 25M 3 ), tidy up. Calculated to use about 1.5 tons of water (50M 2 ÷667M 2 X20 tons), one mu of land is converted to 667M 2 . Determine the consumption of chlorine dioxide per unit volume of contaminated soil as 60mg / L and 80mg / L as the test. After calculation: 1.5 and 2 kg of chlorine dioxide powder with 6% content were used respectively to prepare 30 and 40 kg of mother liquor. Mix with about 1.5 tons of water and pour into the two fields. Since th...

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Abstract

The invention relates to the technical field of polluted soil restoration and particularly relates to an in-situ chemical restoration method for soil. Currently, aiming at the pollution of farmland soil, measurements such as burning and solidifying are mainly adopted abroad. According to the in-situ chemical restoration method, chlorine dioxide is used for decomposing organic pollutants. The method comprises the following steps: (1) calculating the volume of pollution according to the area and depth of a polluted region and measuring the varieties and contents of pollutants; (2) sampling the polluted soil and performing laboratory experiments to determine the consumption amount of chlorine dioxide per polluted soil unit; (3) enabling the amount of chlorine dioxide to deliver to be equal to the consumption amount of chlorine dioxide of X units of polluted oil of polluted volume; (4) preparing a mother solution with chlorine dioxide powder; (5) uniformly mixing the mother solution and irrigating water and irrigating the polluted farmland, wherein the concentration of the mixture is 60-80mg / L and the concentration of treated polluted water body is 1.6-1.8mg / L. The in-situ chemical restoration method is easy to operate, low in construction cost, labor-saving and time-saving and does not affect the soil fertility.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted soil, in particular to a method for in-situ chemical remediation of soil. Background technique [0002] Soil remediation refers to the use of physical, chemical or biological methods to fix, transfer, absorb, degrade or transform pollutants in the soil of the site, reducing its content to an acceptable level, or converting toxic and harmful pollutants into harmless process of hazardous substances. Repair methods are divided into in situ repair and ex situ repair. Ex-situ restoration involves digging and transporting soil, which will not only destroy the original soil structure, but also cause secondary pollution. [0003] Due to the private ownership of land in some developed countries, the land owners have avoided large-scale pollution of the land out of absolute defense of their rights. However, decades of extensive economic development in China has caused serious pollution t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 宋红安
Owner 张家口市绿洁环保技术开发有限公司
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