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Method and covering material for in-situ treatment of polluted bottom mud

A technology of polluted sediment and in-situ treatment, applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of slow function decay, long service life and wide applicability

Inactive Publication Date: 2020-07-03
CCCC THIRD HARBOR ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional sediment treatment methods are mainly divided into two types: ex-situ and in-situ. Ex-situ treatment mainly transfers the polluted sediment to a temporary storage yard for dehydration through dredging, and the dehydrated sediment is then transported to a landfill. However, due to the large amount of bottom mud, the required temporary storage area is large, and it is difficult to acquire land. The economical efficiency of building material products is low, and the market consumption is difficult, which makes the heterogeneous treatment face a big dilemma
Currently, in-situ treatment mostly adopts technologies based on the principle of oxidation, adsorption and passivation. Among them, the oxidation method mostly uses equipment for deep aeration, but it has the problem of high energy consumption and can only reduce the surface sediment; the adsorption method adopts Various porous materials can adsorb specific pollutants, but there are also problems of adsorption saturation and desorption of pollutants after environmental conditions change; the passivation method is mainly aimed at heavy metal pollutants, converting them into an inactive state and reducing biological pollution. Effectiveness, but there is also a situation where changes in environmental conditions lead to the reactivation of toxic heavy metals

Method used

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  • Method and covering material for in-situ treatment of polluted bottom mud
  • Method and covering material for in-situ treatment of polluted bottom mud
  • Method and covering material for in-situ treatment of polluted bottom mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] In this embodiment, a retractable chain conveyor installed on a barge is used to spread the bedding material.

[0065] First, use brightly colored buoys to locate in the spreading waters. The division of each target area is closely related to the capacity of the conveyor hopper and the spreading rate. Before implementation, the speed and arm height of the belt conveyor must be determined.

[0066] Use the grab bucket on the crane to transfer the material from the nearby shore to the barge, and then use the trencher to transfer the material stacked on the barge into the conveyor hopper. The hopper feeds material to the conveyor belt, whose speed and arm height can be remotely controlled. Through field tests, 7-10 tons of materials, including sand (sand) or granular materials, can be evenly spread in the designated area within 15 minutes. The material conveyor can be installed on the water or on the shore. If the conveyor is installed on the shore, the transfer of the ma...

Embodiment 2

[0068] In this embodiment, a helicopter equipped with a spreading bag is used for spreading.

[0069] First, use brightly colored buoys to locate in the spreading waters. The division of each target area is closely related to the size of the spreading belt, the flying speed of the helicopter, and the spreading height. These related parameters must be determined before implementation.

[0070] Ground personnel communicated with the helicopter crew by radio to accurately locate the area and frequency of spraying.

[0071] Use a forklift to fix the spreading bag to the load-bearing rope lowered by the helicopter. After fixing, the helicopter hangs the spreading bag and then goes to the designated area.

[0072] Helicopter spreading adopts segmented deployment method, the area is divided in advance, and landing points are set for each segment. The function of the landing point is to recycle empty bags and load new bags to the helicopter.

Embodiment 3

[0074] In this example, a crane mounted with a clamshell dredger was used for spreading.

[0075] Firstly, use brightly colored buoys to locate in the spreading waters. The division of each target area is closely related to the size of the clamshell dredger and the height of the crane arm. These parameters must be determined before implementation.

[0076] Clamshell-shaped dredgers are used to grab materials, and the dredgers are hoisted above the water area to be sprinkled by a crane, and the dredgers are slowly opened, and then evenly sprinkled into the water body.

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Abstract

The invention discloses a method and a covering material for in-situ treatment of polluted bottom mud. The method for in-situ treatment of polluted bottom mud comprises the following steps: a supporting structure barrier layer and a protective layer are sequentially laid on the surface of the polluted bottom mud, and the supporting structure barrier layer is formed by mixing aggregate and a sealing substance and then interacting with water; the aggregate is natural mineral; and the sealing substance is natural clay, sepiolite, attapulgite or kaolin. The covering material comprises the aggregate and the sealing substance, and the aggregate is the natural mineral; and the sealing substance is natural clay, sepiolite, attapulgite or kaolin. The bottom mud and the water body are efficiently isolated, so that all types of pollutants such as organic matters, nitrogen, phosphorus and heavy metals cannot be released to the water body, and the purpose of in-situ treatment of the polluted bottommud is achieved.

Description

technical field [0001] The application relates to a treatment method of polluted bottom mud, in particular to a method and covering material for in-situ intelligence of polluted bottom mud. Background technique [0002] Due to the impact of human production and life, a large number of lakes, reservoirs, ponds, river courses, and offshore areas have been polluted. These pollutants include various organic substances, heavy metals, nitrogen, and phosphorus, which enter the water body through various channels, and eventually deposit and enrich. On the bottom mud, with the change of climate and hydrological conditions, as well as the disturbance of human activities, these pollutants in the bottom mud will be continuously released, seriously threatening the ecosystem and human health. [0003] Traditional sediment treatment methods are mainly divided into two types: ex-situ and in-situ. Ex-situ treatment mainly transfers the polluted sediment to a temporary storage yard for dehydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00E02B3/12
CPCC02F11/00E02B3/12
Inventor 李斗刘慧平
Owner CCCC THIRD HARBOR ENG
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