A kind of accelerated carbonization tester for polluted soil and its application

A technology of contaminated soil and test equipment, applied in the field of contaminated soil remediation, can solve problems affecting the authenticity and accuracy of test results, affecting the contact area, soil samples or test pieces with different degrees of carbonization, etc., to avoid deviations in test results, avoid The effect of cross contamination

Active Publication Date: 2017-07-07
上海化工院环境工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Some researchers have tried to use accelerated carbonation technology to study the long-term stabilization effect of cement-based or other solidified materials on soil pollutants, but the research process often has the following two deficiencies: (1) The test materials are generally solidified bodies / blocks, Therefore, the accelerated carbonation research cases of stabilized soil are relatively scarce; (2) Measures to prevent cross-contamination of samples were not taken during the accelerated carbonation test, which will significantly affect the authenticity and accuracy of the test results sex
[0015] If the stainless steel frame structure in the carbonation box is changed to an impermeable trough structure, the water flow from the upper frame to the lower frame can be avoided, but a large amount of water may be generated in the trough structure, resulting in cross-contamination between samples; Putting the sample in a Petri dish or other container will affect the contact area of ​​the soil sample or test piece with carbon dioxide, resulting in different degrees of carbonization of the soil sample or test piece in different parts, thus affecting the authenticity and accuracy of the test results

Method used

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  • A kind of accelerated carbonization tester for polluted soil and its application

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Experimental program
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Effect test

Embodiment 1

[0063] A contaminated soil accelerated carbonation tester, its structure is as follows figure 1 As shown, it includes a water-retaining top plate 5, a sample chamber and a base that are sequentially connected from top to bottom. The sample chamber includes a cylindrical sample chamber body 1, and sample chamber upper end flanges 2 that are respectively arranged at the upper and lower ends of the sample chamber body 1. And the flange 3 at the lower end of the sample chamber, the water retaining top plate 5 is in the shape of a straight conical surface, and is covered on the upper end of the sample chamber. The top bolt 15 of the sample chamber is connected to the flange 2 at the upper end of the sample chamber, and the lower end of the flange 3 at the lower end of the sample chamber is provided with a first groove, and a matching Teflon O-ring at the end of the sample chamber is provided in the first groove 6. The upper end of the base flange 4 is provided with a second groove,...

Embodiment 2

[0065] Utilize the polluted soil accelerated carbonization tester described in embodiment 1 to carry out the test, simulate the long-term curing effect of different curing agents on soil pollutants when the carbon dioxide concentration rises on a longer time scale, the simulation test process is as follows:

[0066] (1) Contaminated soil solidification treatment and maintenance

[0067] Three kinds of curing agents were used to solidify the contaminated soil. The three curing agents were Portland cement with a strength grade of 42.5, quicklime, and quicklime / fly ash (mass ratio 1:1). The heavy metal contaminated soil was collected from Pudong, Shanghai. In the new area, the addition ratio of curing agent is 10%, and the water-cement ratio is 1:3. Each curing agent is set to be repeated 12 times, with a total of 36 samples;

[0068] Take by weighing 1620g soil (wet weight) and 162g solidifying agent for each sample, measure 51ml deionized water; Put the weighed polluted soil, s...

Embodiment 3

[0089] Utilize the polluted soil accelerated carbonization tester described in embodiment 1 to carry out the test, simulate the long-term stabilizing effect of different stabilizers on soil pollutants when the carbon dioxide concentration rises on a longer time scale, the simulation test process is basically the same as embodiment 2, different The advantage is that:

[0090] (1) Stabilization treatment and maintenance of contaminated soil: select three stabilizers to stabilize the contaminated soil, the three stabilizers are quicklime, sodium sulfide and dipotassium hydrogen phosphate respectively, and each stabilizer is set to repeat 6 times , a total of 18 samples were cured at room temperature for 7 days, and the other parameters and procedures remained unchanged;

[0091] (3) Accelerated carbonation tester installation and sample placement

[0092] (2) Put the contaminated soil samples after stabilization treatment: After the curing is completed, put the three replicate s...

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Abstract

The invention relates to an accelerated carbonization tester for polluted soil, which comprises a water-retaining top plate (5), a sample chamber and a base sequentially connected from top to bottom, the water-retaining top plate (5) is covered on the upper end of the sample chamber, and the The sample chamber includes a sample chamber main body (1), and a sample chamber upper end flange (2) and a sample chamber lower end flange (3) respectively arranged at the upper and lower ends of the sample chamber main body (1), and the base includes a base flange (4) and the liquid collecting tank (13) arranged under the base flange (4), and the lower end flange (3) of the sample chamber is sealingly connected with the base flange (4). Compared with the prior art, the invention has the advantages of high accuracy of test results, no cross-contamination between samples, high degree of carbonization of polluted soil, and the like.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a contaminated soil accelerated carbonization test device and an accelerated carbonization simulation test method thereof. Background technique [0002] With the acceleration of urbanization and industrial transfer, the number of contaminated sites relocated or left behind by urban industrial enterprises in my country is increasing day by day, and site-contaminated soil has become a limiting factor for the safe reuse of land resources in many large and medium-sized cities in my country. The research and practice of site contaminated soil remediation has become an important content in the field of environmental governance in my country. [0003] Solidification and stabilization has become the main technical method for heavy metal contaminated soil remediation in my country. At present, provinces and cities such as Hunan, Hubei, Chongqing, Jiangsu, Zhejiang a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 张长波倪晓芳陈保华陈海红吴向阳商照聪杨桂兰
Owner 上海化工院环境工程有限公司
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