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Activated carbon capping disposal method for heavy metal pollution dredged materials

A disposal method, heavy metal technology, applied in the field of marine pollution control, to achieve the effect of simple operation, reduced consumption, and improved disposal effect

Pending Publication Date: 2021-12-03
杨文超
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In order to solve the above-mentioned problem of disposal of heavy metal-polluted dredged materials and fill the vacancy in the disposal technology of polluted dredged materials, the object of the present invention is to provide a method for in-situ restoration and disposal of heavy metal-contaminated dredged materials based on activated carbon, which can alleviate the dredged materials marine pollution to a certain extent. Dump disposal pressure, and provide certain technical support and data support for the management of heavy metal polluted dredged materials

Method used

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  • Activated carbon capping disposal method for heavy metal pollution dredged materials
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  • Activated carbon capping disposal method for heavy metal pollution dredged materials

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Experimental program
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Effect test

Embodiment 1

[0038] Preparation of heavy metal polluted dredged materials.

[0039] Three typical heavy metals, Cu, Pb and Cd, were selected as target pollutants for capping disposal research. In order to meet the experimental requirements, using Cd(NO 3 ) 2 4H 2O, Pb(NO 3 ) 2 and Cu(NO 3 ) 2 ·3H 2 O dissolved in deionized water to make a concentration of 10mg L -1 , 500mg L -1 and 400mg L -1 A mixed solution of Cd, Pb and Cu was used to prepare polluted dredging. Put the dry dredged material (about 700g) in the device, then slowly pour the above heavy metal mixture until the dredged material is completely soaked, and let it stand for 3 days.

Embodiment 2

[0041] The construction of cap experiment apparatus.

[0042] Build a small cap experiment setup, such as image 3 As shown, activated carbon is used as the capping material to simulate the in-situ capping disposal of polluted dredged materials. The construction situation is as follows:

[0043] 1) The experimental device is an acrylic cylindrical device with an inner diameter of 8 cm and a height of about 47 cm. The device is provided with an overlying water sampling port for collecting overlying water samples during the capping experiment;

[0044] 2) The construction process of the capping experimental device is as follows: firstly, a certain thickness of polluted dredging material (about 17 cm in thickness) is placed in the capping device, and then activated carbon with a thickness of 2 cm is placed on the device. Ionized water reaches the height of the device at about 43cm;

[0045] 3) Set a group of exposure groups without restoration materials as the control group;

...

Embodiment 3

[0049] To test the effect of activated carbon in situ capping on the release of heavy metals from polluted dredged materials.

[0050] The capping experiment lasted for 50 days, and samples were collected regularly through the overlying water sampling port. The collected samples were filtered through a 0.45 μm filter membrane and the content of heavy metals was determined using an atomic absorption spectrophotometer. The retardation was analyzed by comparing the difference in the concentration of heavy metals in the overlying water between the exposure group and the activated carbon capping group.

[0051] Such as Figure 4~6 Shown are the changes in the concentration of Cu, Pb and Cd in the overlying water of the exposure group and the activated carbon capping device group during the capping experiment.

[0052] according to Figure 4 , for Cu, during the capping experiment, the Cu concentration in the overlying water of the exposure group rose slowly and fluctuated, and t...

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Abstract

The invention relates to an activated carbon capping disposal method for heavy metal pollution dredged materials, and belongs to the technical field of marine pollution treatment. The disposal method comprises the step of directly covering the surface of the heavy metal pollution dredged materials with an activated carbon remediation material for in-situ capping disposal. Compared with the prior art, the method has the following technical advantages that (1) the in-situ capping disposal method with activated carbon as the remediation material can control release of heavy metal components with high migration ability in the pollution dredged materials; (2) an in-situ remediation method is adopted to dispose the pollution dredged materials, so that the pressure of ocean dumping disposal of the dredged materials can be relieved to a certain extent; (3) the active material activated carbon is adopted to replace a traditional thick-layer capping material, so that the use amount of the remediation material can be reduced, and the disposal effect is improved; and (4) the method is simple and convenient to operate and has a certain application prospect on the dredged materials under various pollution conditions.

Description

technical field [0001] The invention relates to an activated carbon cap disposal method for heavy metal-polluted dredged materials, and belongs to the technical field of marine pollution control. Background technique [0002] Dredged matter refers to the sediment excavated from underwater to ensure the smooth passage of ports, wharfs, waterways, and anchorages, and to meet the needs of port facilities and other sea-related engineering construction. [1] . The main way of disposal of dredged materials is ocean dumping. Clean dredged material can be dumped directly into the ocean, while contaminated or polluted dredged material can be dumped after limited disposal [1] . Such as figure 1 Shown is the 2010-2019 national ocean dumping volume [2] . The main ones are dredged materials. In order to alleviate the pressure of ocean dumping of dredged materials in my country, it is necessary to develop technologies suitable for large-scale disposal of complex dredged materials. [...

Claims

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Application Information

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IPC IPC(8): B09B1/00
CPCB09B1/004Y02W30/30
Inventor 杨文超宋爽陈虹韩建波
Owner 杨文超
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