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Treatment method and device for riverway and lake heavy metal pollution bottom sludge

A technology of contaminated bottom sludge and treatment methods, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., to prevent sieve clogging, reduce disposal costs, and short treatment cycle Effect

Active Publication Date: 2012-10-24
山东瑞密迪环保科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the existing ex-situ treatment technology for heavy metal-contaminated sediment after dredging, the present invention provides a method for treating heavy metal-contaminated sediment of rivers and lakes with thorough treatment and good effect, and at the same time provides a device for realizing the method

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  • Treatment method and device for riverway and lake heavy metal pollution bottom sludge

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Embodiment Construction

[0019] figure 1 The structure of the treatment device for the heavy metal-contaminated sediment of rivers and lakes in the present invention is given, which mainly includes a screening cylinder 1 and a sludge dehydrator 9. The upper part of the screening cylinder 1 is provided with a sediment inlet 2, and the screening cylinder The bottom surface of the body 1 communicates with the feed port of the sludge dehydrator 9 . Screening cylinder 1 is provided with crushed stone screening net 3, coarse sand screening net 7 and fine sand screening net 8 from top to bottom in sequence. Stone discharge port 4, coarse sand discharge port 6 and fine sand discharge port 8. , the crushed stone screen 3, the coarse sand screen 7 and the fine sand screen 8 are in an inclined state in the screening cylinder 1 relative to the axis of the screening cylinder 1, which is conducive to the screening of solid particles The cylinder 1 is discharged by its own weight. The angle of inclination is not ...

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Abstract

The invention provides treatment method and device for riverway and lake heavy metal pollution bottom sludge. The treatment method comprises the following steps: removing heavy metal pollution bottom sludge from a riverway or a lake through cutter-suction environmental dredging, transporting the heavy metal pollution bottom sludge to the shoreside, directly sieving and dehydrating the heavy metalpollution bottom sludge, and dividing the removed heavy metal pollution bottom sludge into gravels, coarse sands, fine sands, clay particles and dehydration solution; adding a heavy metal adsorption agent in the dehydration solution, removing heavy metals through settlement, discharging supernate into water, and sending precipitate after dehydration to a dangerous solid waste landfill to be treated; and respectively carrying out subsequent treatment on solid with different particle sizes. The treatment device comprises a sieving cylinder body and a sludge dehydrator, wherein the bottom surface of the sieving cylinder body is communicated with a feeding hole of the sludge dehydrator, and a gravel sieve net, a coarse sand sieve net and a fine sand sieve net are sequentially arranged in the sieving cylinder body from top to bottom. With the adoption of the treatment method and device, the riverway and lake heavy metal pollution bottom sludge collected by cutter-suction dredging is directly classified and treated without desiccation, the treatment period is short, and the cost is low.

Description

technical field [0001] The invention relates to a method and device for treating heavy metal-contaminated bottom sludge in rivers and lakes, and belongs to the technical field of heavy metal-polluted bottom sludge treatment. Background technique [0002] Heavy metals are the main pollutants in the bottom mud of rivers and lakes. They are deposited in the bottom mud through adsorption, complexation, precipitation, etc., and at the same time maintain a certain dynamic balance with the water phase. When the environmental conditions change, heavy metals are easy to enter again. The water body becomes secondary pollution. Heavy metal environmental pollutants are persistent pollutants, once they enter the environment, they will persist in the environment. The heavy metals in the sediment will pollute the water body and harm the benthic organisms of the river. They are highly toxic and can accumulate and pass in the food chain, seriously threatening the living environment and heal...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/14
Inventor 张志斌康兴生张晓蕊张彦浩孙翠珍陈文兵武道吉李善仁
Owner 山东瑞密迪环保科技有限公司
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