In-situ ecological restoration method for riverway polluted sediment

A technology for polluted sediment and ecological restoration, applied in the direction of water pollutants, chemical instruments and methods, water/sludge/sewage treatment, etc., to achieve the effects of convenient operation, enhanced self-purification ability, and less secondary pollution

Active Publication Date: 2012-10-31
山东瑞密迪环保科技有限公司
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Problems solved by technology

[0006] Aiming at the problems existing in the existing river channel polluted sediment treatment technology, the present invention provides an in

Method used

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  • In-situ ecological restoration method for riverway polluted sediment
  • In-situ ecological restoration method for riverway polluted sediment

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Example Embodiment

[0016] like figure 1 As shown in the figure, the in-situ ecological restoration method of the river polluted sediment of the present invention is to lay three layers of plant ecological concrete on the sediment 4 in the river channel: the upper layer 1 , the middle layer 2 and the lower layer 3 .

[0017] (1) The lower layer 1 is a non-foaming vegetative ecological concrete with a thickness of 5cm-10cm, whose function is to block the release of sediment pollutants to the overlying water body.

[0018] This layer of concrete does not foam, does not appear marshmallow-like, and its internal pore size is small, so as to avoid the porous structure that cannot hinder the migration of pollutants to the water body. In addition, 30%-50% by weight of iron-aluminum oxides are added to the concrete of this layer. The iron-aluminum oxides can absorb the heavy metals released by the sediment in this layer, and then gradually absorb them from the plants grown in the middle layer.

[0019] ...

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Abstract

The invention provides an in-situ ecological restoration method for riverway polluted sediment. Three layers of plant ecological concrete are laid on riverway sediment at an upper layer, an intermediate layer and a lower layer; unfoamed plant ecological concrete with the thickness of 5-10 centimeters is laid at the lower layer and has an effect of preventing sediment pollutant from upwards releasing to an overlying water body; iron-aluminum oxides are added into the concrete; formed plant ecological concrete with the thickness of 10 centimeters is laid at the intermediate layer and has an effect of providing a carrier for growth of a submerged plant; activated carbon particle piles are distributed in the formed concrete layer; and the submerged plant is planted in the activated carbon particle piles; the formed plant ecological concrete with the thickness of 2-5 centimeters is laid at the upper layer; and the iron-aluminum oxides are added into the concrete. The in-situ ecological restoration method is simple and practical and is convenient in operation, plant ecological concrete bricks are covered on the riverway sediment, heavy metal in the sediment is prevented from entering the water body, a pollution way of a pollution resource is cut off, secondary pollution is difficult to generate, and the heavy metal in the sediment is absorbed by the submerged plant.

Description

technical field [0001] The invention relates to a repair method for river bottom mud polluted by heavy metals, and belongs to the technical field of river bottom mud restoration. Background technique [0002] With the continuous development of river polluted water control technology and the continuous improvement of treatment effects, the secondary pollution of heavy metal-contaminated sediments in rivers has increasingly attracted people's attention. The remediation technology of river polluted sediment is mainly divided into in-situ treatment technology and ex-situ treatment technology. Its advantages of low cost, simple operation, and not easy to produce secondary pollution have attracted much attention. Nevertheless, the current traditional in-situ sediment treatment technology still has great defects. [0003] The in-situ treatment technology of polluted bottom sludge is "a treatment method for river polluted bottom sludge" disclosed in Chinese patent document CN10178...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/34C02F101/20
CPCY02A20/402
Inventor 张志斌李锦祥孙翠珍张彦浩张天元张文辉武道吉
Owner 山东瑞密迪环保科技有限公司
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