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In-situ river bottom mud heavy metal treatment method

A technology for in-situ treatment of river bottom sludge, applied in chemical instruments and methods, sludge detoxification, sludge treatment, etc., to achieve good adsorption performance, content reduction, and high removal efficiency

Active Publication Date: 2016-06-01
HUNAN SAMMNS ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the defects existing in the restoration technology of heavy metal pollution in rivers, the purpose of the present invention is to provide a method that can effectively remove and recycle heavy metal pollution in the river sediment without destroying the original ecological system of the river or affecting the riverbed. A method for stability, safety of embankments on both sides of the river and safety of water intake in the lower reaches of the river. This method is safe, low-cost, and easy to operate, and is suitable for popularization and use.

Method used

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  • In-situ river bottom mud heavy metal treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0061] The content of heavy metal cadmium in the sediment of section A of a river in eastern Hunan is 5.8mg / kg; the content of zinc is 792.2mg / kg; the content of copper is 263.1mg / kg.

[0062] The double-layer rhombic cylinder equipment is selected, the side length of the rhombus-shaped outer cover is 0.2 meters, the outer side length of the inner material layer is 0.16 meters, the inner side length is 0.06 meters, the hole diameter of the inner and outer walls is 1.2 mm, and the cylinder length is 1 m. The height of the solid cone is 0.15 meters, and the amount of the inner material MA01 is 10kg. A material column is inserted every 3 meters in the river bottom mud, and the outer cover is removed. The top of the inner material column is 0.1m above the bottom mud surface.

[0063] Through a 4-month cycle treatment, the heavy metal cadmium content in the river sediments was reduced to 3.3mg / kg; the zinc content was reduced to 472.3mg / kg; the copper content was reduced to 183.6mg / kg. ...

Embodiment 2

[0066] The content of heavy metal cadmium in the sediment of section B of a river in eastern Hunan is 8.7mg / kg; the content of zinc is 668.9mg / kg; the content of copper is 233.6mg / kg.

[0067] The material column equipment is selected. The amount of the nanoporous ceramic composite material MA01 is 15 kilograms, the diameter of the material column cylinder is 0.2 meters, the length is 1.0 meters, the inner diameter is 0.08 meters, and the height of the bottom cone is 0.15 meters. Insert the material cylinders vertically into the bottom mud of the river. Each column is 2 meters apart, and each pillar is inserted into the bottom mud to be 0.1 meters above the surface of the bottom mud.

[0068] Through the 12-month cycle treatment, the heavy metal cadmium content in the river sediments was reduced to 4.5mg / kg; the zinc content was reduced to 332.6mg / kg; the copper content was reduced to 150.9mg / kg. By extending several treatment cycles, the removal rate of the heavy metals cadmium, z...

Embodiment 3

[0071] The content of heavy metal cadmium in the sediment of section C of a river in eastern Hunan is 4.0 mg / kg; the content of zinc is 682.7 mg / kg; the content of copper is 221.8 mg / kg.

[0072] Material brick equipment is selected. Each block of cuboid brick-like nano-porous ceramic composite materials MA01 and MP01 (mass 1:1) weighs 2 kilograms. On average, 4 blocks of nano-porous ceramic composite materials are buried in the river bottom mud per square meter, with a depth of 40 cm .

[0073] Through the 12-month cycle treatment, the heavy metal cadmium content in the river sediments was reduced to 1.7 mg / kg; the zinc content was reduced to 320.2 mg / kg; the copper content was reduced to 113.5 mg / kg. By extending several treatment cycles, the removal rate of the heavy metals cadmium, zinc and copper in the river bottom sludge reached over 85%.

[0074] If the multiple metal ions adsorbed by MA01 reach saturation, MA01 can be eluted with hydrochloric acid with a concentration of 10...

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Abstract

The invention discloses an in-situ river bottom mud heavy metal treatment method. The method comprises the following steps: preparing rectangular bricks, columns or particles from a nanometer porous ceramic composite material, then planting or fixing the rectangular bricks, columns or particles into the river bottom mud according to a certain arrangement, so as to carry out adsorption treatment on the heavy metal ions in the river bottom mud. The method can effectively remove heavy metal pollution from the river bottom mud, further recover the heavy metal ions without causing damage to the original ecosystem of the river, affecting the stability of the riverbed, safety of riverbanks on both sides and safety of water taking and using at the downstream of the river; the method is safe, low in cost, simple and convenient to operate, and suitable for popularization and application.

Description

Technical field [0001] The invention relates to a method for treating heavy metals in river sediments in situ, and belongs to the technical field of river heavy metal pollution prevention and control. Background technique [0002] River bottom mud refers to the surface sediments at the bottom of the water body. It is composed of sediment, soil, humus and microorganisms. It is the main living place and food source of benthic organisms in the river, and an important part of the river ecosystem. River sediment is an important part of the river ecosystem, and it plays a vital role in the purification of river water quality. With the rapid development of society and economy, a large amount of domestic sewage and industrial wastewater are discharged into the river, and the river sediment is polluted. Increasingly serious, long-term accumulation makes the pollutants in the bottom mud complex and difficult to remove. Especially heavy metal pollution caused by industrial development, bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
CPCC02F11/004C02F2101/20C02F2303/06C02F2305/08
Inventor 奉向东王健江幸赵铁程坤周磊戴佰林
Owner HUNAN SAMMNS ENVIRONMENTAL PROTECTION CO LTD
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