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Repair technology for river and lake bottom mud site polluted by heavy metal

A heavy metal and sediment technology, applied in sludge treatment, water/sludge/sewage treatment, river regulation, etc., can solve problems such as high cost, difficulty in turning river sediment, and difficult large-scale application on site, so as to avoid Outward transportation, avoiding the risk of secondary pollution, and saving transportation costs

Inactive Publication Date: 2014-01-22
JIANGSU JIANGDA ECOLOGICAL SCI & TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of online dosing of heavy metal eluents and vacuum extraction and separation of eluents in on-site pipelines is its core part, because it better solves the following problems: chemical leaching and leaching methods have the most direct effect but are difficult to achieve on-site large-scale Application, the river sediment in flow-plastic state is difficult to turn and the cost is high; physical restoration can be operated on-site engineering, but there are still problems in terms of effect and economy

Method used

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  • Repair technology for river and lake bottom mud site polluted by heavy metal

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Effect test

Embodiment 1

[0022] Such as figure 1 Shown: in order to illustrate the present invention better, be convenient to understand technological process of the present invention, typical but non-limiting embodiment of the present invention is as follows:

[0023] In this example, the volume of the elution pool is 10000m 3 , the specific process is:

[0024] (1) Mud transportation: transport the contaminated bottom mud to the mud pipeline through the cutter suction dredger or mud pump hydraulic excavation unit, and control the solid content of the mud at 35-40%;

[0025] (2) Elution agent: Add the eluent agent online in the pipeline. The composition of the eluent agent is citric acid. When feeding, the mass ratio of agent:slurry solids is 3:1000;

[0026] (3) Transportation: The agent and mud solids in step (2) are mixed and transported to the elution tank through the mud pipeline, and the middle end of the mud pipeline is connected to the dosing and mixing device;

[0027] (4) Elution and sep...

Embodiment 2

[0033] Embodiment 2 A kind of on-site restoration process of heavy metal polluted river and lake mud

[0034] (1) Mud transportation: transport the contaminated bottom mud to the mud pipeline through cutter suction dredgers or mud pump hydraulic excavation units, and control the solid content of the mud between 35% and 40%;

[0035] (2) Elution agent: Add the eluent agent online in the pipeline. The composition of the eluent agent is citric acid. When feeding, the mass ratio of agent:slurry solids is 5:1000;

[0036] (3) Transportation: The agent and mud solids in step (2) are mixed and transported to the elution tank through the mud pipeline, and the middle end of the mud pipeline is connected to the dosing and mixing device;

[0037] (4) Elution and separation: the mixed mud obtained in step (3) was left to stand for 120 hours; the mud after standing was vacuum pumped to separate the eluent, and the vacuum degree was controlled to 0.06MPa, and the eluent was discharged and c...

Embodiment 3

[0039] Embodiment 3 A kind of on-site restoration process of heavy metal polluted river and lake mud

[0040] (1) Mud transportation: transport the contaminated bottom mud to the mud pipeline through cutter suction dredgers or mud pump hydraulic excavation units, and control the solid content of the mud between 35% and 40%;

[0041] (2) Elution agent: Add the eluent agent online in the pipeline. The composition of the eluent agent is citric acid. When feeding, the mass ratio of agent:mud solids is 4:1000;

[0042] (3) Transportation: The agent and mud solids in step (2) are mixed and transported to the elution tank through the mud pipeline, and the middle end of the mud pipeline is connected to the dosing and mixing device;

[0043] (4) Elution and separation: the mixed mud obtained in step (3) was left to stand for 110 hours; the mud after standing was vacuum pumped to separate the eluent, and the vacuum degree was controlled to 0.07MPa, and the eluent was discharged and coll...

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Abstract

The invention relates to a repair technology for a river and lake bottom mud site polluted by heavy metal. The technology comprises the following processing steps that (1) polluted bottom mud is conveyed to a pipeline by hydraulicking; (2) elution agents are added to the pipeline on line; (3) after blending, the mud is conveyed to an elution pool through the pipeline; (4) vacuum pumping and discharging are carried out on the static mud, eluant is separated; (5) when the heavy metal removal rate in the bottom mud reaches the designed value, work is stopped, and acceptance checking is carried out. According to the repair technology, on the basis that the effect of heavy metal elution repairing is guaranteed, on-site large-scale continuous operation is achieved, polluted bottom sample malposition repairing conveying cost and risks are lowered, the vacuum pumping mode accelerates heavy metal elution speed, and social and economical benefits are obvious.

Description

technical field [0001] The invention relates to an on-site restoration process for river and lake bottom mud polluted by heavy metals, in particular to an on-site restoration process for river bottom mud polluted by large-scale, high-concentration heavy metals, and belongs to the field of heavy metal-contaminated soil restoration. Background technique [0002] For a long time, due to the discharge of a large amount of industrial wastewater that has not been properly treated in the river and lake basin, the pollution of the river has become increasingly serious. Because heavy metal pollutants are not easily degraded, they are eventually transferred to the sediment, resulting in a significant increase in the content of heavy metals in the sediment. Heavy metal elements have become the main potential risks in river sediments such as rivers and lakes due to their ecological and environmental effects such as degradability and bioaccumulation. Therefore, how to effectively remove...

Claims

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Application Information

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IPC IPC(8): E02B3/02C02F11/00
Inventor 李冲吕志刚许盛凯王海江李燕萍
Owner JIANGSU JIANGDA ECOLOGICAL SCI & TECHCO
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