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Method for removing heavy metals Zn and Cu in dredged river sediment

A heavy metal and sediment technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of long cycle, slow effect, high investment cost and power consumption, and achieve The effect of short treatment period, lower moisture content and convenient operation

Inactive Publication Date: 2013-03-13
HUNAN UNIV
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  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that the cycle is long and the effect is slow.
However, the investment cost and power consumption of this method are high and it is difficult to apply it in actual engineering.

Method used

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  • Method for removing heavy metals Zn and Cu in dredged river sediment

Examples

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Effect test

Embodiment 1

[0019] A method for removing heavy metals Zn and Cu from the sediment at the estuary of Xiawan Port, Xiangjiang River, Zhuzhou (for the technical route, see figure 1 ), including the following steps:

[0020] (1) Preparation of bottom mud: Take 50g of dried bottom mud at the estuary of Xiawan Port in Xiangjiang, Zhuzhou, remove leaves, branches, large particles, etc. in the bottom mud, add 200mL deionized water, stir until uniform, and get bottom mud .

[0021] (2) Acidification treatment: select industrial-grade concentrated sulfuric acid with a mass concentration of 98%, and slowly add concentrated sulfuric acid to the bottom mud while stirring until the pH is 2.

[0022] (3) Oxidation treatment: Add 30% hydrogen peroxide (the mass of hydrogen peroxide is 11% of the dry sediment mass) to the mixture obtained from the acidification treatment, and stir until uniform.

[0023] (4) Microwave heating: place the oxidized reaction product in a microwave reactor for microwave heat...

Embodiment 2

[0028] A method for removing heavy metals Zn and Cu from the bottom mud of Zhuzhou Xiangjiang Xiawan Port sewage outlet (technical route see figure 1 ), including the following steps:

[0029] (1) Preparation of bottom mud: Take 50g of dried bottom mud from the sewage outlet of Xiawan Port, Xiangjiang, Zhuzhou, remove leaves, branches, large particles, etc. in the bottom mud, add 200mL deionized water, stir until uniform, and get bottom mud .

[0030] (2) Acidification treatment: select industrial-grade concentrated sulfuric acid with a mass concentration of 98%, and slowly add concentrated sulfuric acid to the bottom mud while stirring until the pH is 2.

[0031] (3) Oxidation treatment: Add 30% hydrogen peroxide (the mass of hydrogen peroxide is 11% of the dry sediment mass) to the acidified mixture, and stir until uniform.

[0032] (4) Microwave heating: place the oxidized reaction product in a microwave reactor for microwave heating to 60°C, keep it warm for 10 minutes, ...

Embodiment 3

[0037] A method for removing heavy metals Zn and Cu from the sediment at the estuary of Xiawan Port, Xiangjiang River, Zhuzhou (for the technical route, see figure 1 ), including the following steps:

[0038] (1) Preparation of bottom mud: Take 50g of dried bottom mud at the estuary of Xiawan Port in Xiangjiang, Zhuzhou, remove leaves, branches, large particles, etc. in the bottom mud, add 200mL deionized water, stir until uniform, and get bottom mud .

[0039] (2) Acidification treatment: select industrial-grade concentrated sulfuric acid with a mass concentration of 98%, and slowly add concentrated sulfuric acid to the bottom mud while stirring until the pH is 2.

[0040] (3) Oxidation treatment: Add 30% hydrogen peroxide (the mass of hydrogen peroxide is 11% of the dry sediment mass) and 0.08g FeSO to the acidified mixture. 4 ·7H 2 O, stir until uniform.

[0041] (4) Microwave heating: place the oxidized reaction product in a microwave reactor for microwave heating to 6...

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Abstract

The invention discloses a method for removing heavy metals Zn and Cu in dredged river sediment, which comprises the following steps: mixing dredged river sediment and water according to a mass ratio of 1:(2-10) to obtain sediment slurry; acidizing and oxidizing the sediment slurry, performing microwave heating on the obtained reaction product to 60-120 DEG C, and keeping the temperature for 5-10 minutes; after the heating reaction is finished, filtering to obtain sediment slag and a filtrate containing Zn and Cu; and chemically depositing the filtrate, and regulating the pH value to 7.5-8.5, thus obtaining a clear solution and heavy metal slag containing Zn and Cu. The method disclosed by the invention is simple in process, convenient to operate, low in investment and cost, short in treatment period and good in treatment effect, and can realize the reutilization of sediment, thereby having certain economic and social benefits.

Description

technical field [0001] The invention relates to a method for removing heavy metals in dredged river bottom mud, in particular to a technical method for removing heavy metals Zn and Cu in dredged river bottom mud by using a microwave-assisted acidification oxidation method. Background technique [0002] Heavy metal pollution in river sediments is one of the most important environmental problems in the world. Human production activities such as mine development, industrial smelting, and electronic waste treatment will produce a large amount of wastewater, and the wastewater contains a large amount of heavy metals, which are several times, dozens of times, or even hundreds of times higher than the national standard. If this untreated sewage is directly discharged into the outside world, the sewage will pass through a series of channels such as surface runoff, and finally collect in rivers. When the self-purification capacity of the river is much lower than the rate of man-made...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F101/20
Inventor 袁兴中王侯吴艳黄华军吴志斌王乐乐林宁波任苗苗
Owner HUNAN UNIV
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