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Method for removing heavy metal lead in water sediment

A technology for heavy metals and sediments, applied in the fields of lakes, dredged rivers, and heavy metals in harbor sediments. It can solve the problems of high-efficiency leaching agents or bacteria screening and development difficulties, and achieve less investment in equipment, convenient operation, and less harm. Effect

Inactive Publication Date: 2013-12-18
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has the characteristics of simple process and high treatment efficiency, but it is difficult to screen and develop high-efficiency eluents or bacteria, and there are unresolved or perfect problems such as secondary pollution.

Method used

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  • Method for removing heavy metal lead in water sediment
  • Method for removing heavy metal lead in water sediment
  • Method for removing heavy metal lead in water sediment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This implementation includes 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 500mL of deionized water, stir until uniform, and prepare bottom mud;

[0039] (2) Acidification treatment: While stirring the bottom mud prepared in step (1), add concentrated nitric acid with a mass concentration of 65% to 68%, adjust the pH to 1.3, stir until uniform, and fully react;

[0040] (3) Chlorination treatment: while stirring the mixture after the acidification treatment in step (2), add inorganic chloride with a chloride ion concentration of 1.3mol / L, stir until uniform, and fully react;

[0041] (4) Microwave treatment: place the reaction product after the chlorination treatment in step (3) in a microwave reactor, heat it to 80°C for 10 minutes, and cool to room temperature after the heating reaction is completed;

...

Embodiment 2

[0052] This embodiment includes the following steps:

[0053] (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 500mL of deionized water, stir until uniform, and prepare bottom mud;

[0054] (2) Acidification treatment: While stirring the bottom mud prepared in step (1), add concentrated nitric acid with a mass concentration of 65% to 68%, adjust the pH to 0 to 6, stir until uniform, and fully react;

[0055] (3) Chlorination treatment: while stirring the acidified mixture in step (2), add sodium chloride with a chloride ion concentration of 0-2 mol / L, stir until uniform, and fully react;

[0056] (4) Microwave treatment: place the reaction product after the chlorination treatment in step (3) in a microwave reactor, heat it to 80°C, and keep it warm for 10 minutes. After the heating reaction is completed, cool it down to room temperature;

[00...

Embodiment 3

[0061] This embodiment includes the following steps:

[0062] (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 500mL of deionized water, stir until uniform, and prepare bottom mud;

[0063] (2) Acidification treatment: While stirring the bottom mud prepared in step (1), add concentrated nitric acid with a mass concentration of 65% to 68%, adjust the pH to 1.5, stir until uniform, and fully react;

[0064] (3) Chlorination treatment: while stirring the acidified mixture in step (2), add sodium chloride with a chloride ion concentration of 0-2 mol / L, stir until uniform, and fully react;

[0065] (4) Microwave treatment: place the reaction product after the chlorination treatment in step (3) in a microwave reactor, heat it to 80°C, and keep it warm for 10 minutes. After the heating reaction is completed, cool it down to room temperature;

[0066]...

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Abstract

The invention discloses a method for removing heavy metal lead in water sediment. The method comprises the following steps: (1) preparing sediment slurry; (2) acidifying; (3) chlorinating; (4) performing microwave treatment; (5) performing filtration treatment; (6) washing sludge obtained by the step (5) with water, and then performing solid-liquid separation to obtain sediment sludge and lead-containing filtrate. The method has the advantages of simple process, less investment, low cost, short treatment period, good treatment effect, is convenient to operate and capable of achieving a removal rate of 89.49 percent for the heavy metal lead in sediments of dredged rivers, lakes and harbors; by using a microwave-reinforced acidification and chlorination method, the heavy metal in the sediment can be removed, and the content of water in the sediment can also be reduced, so that volume reduction of the sediment is realized, and favorable conditions are provided for subsequent recycling.

Description

technical field [0001] The invention relates to a method for removing heavy metals from bottom mud of dredged rivers, lakes and harbors, in particular to a method for removing heavy metal lead from bottom mud of water bodies. Background technique [0002] Heavy metal pollution in water sediments has become an important environmental pollution problem worldwide. The world's industrial development has caused heavy metal pollution to occur frequently in the water bodies and sediments of rivers, lakes and harbors, resulting in serious pollution of most rivers, lakes and harbors in the world. The pollution status of the sediment under the water body plays an important role in comprehensively measuring the quality of the water environment. [0003] Heavy metals in sediment water often serve as the final storage and destination, and maintain a certain dynamic balance with the water phase. When the surrounding environmental conditions change, the form of heavy metals in the sedime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 袁兴中王乐乐钟华曾光明王侯林宁波吴志斌朱刚刚王达菲黄丹莲梁婕
Owner HUNAN UNIV
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