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Remediation method of heavy metal polluted sediment

A technology of polluted sediment and restoration method, applied in sludge treatment, sludge detoxification, water pollutants and other directions, can solve the problems of reduced utilization efficiency, limited application, secondary pollution, etc., to improve utilization efficiency and prevent agglomeration effect, the effect of improving dispersibility

Active Publication Date: 2020-02-11
沃邦环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the commonly used chemical fixatives are divided into several categories such as natural minerals, organic matter, lime, and replacement metals. These chemical fixatives have the following problems: the fixation efficiency of natural mineral fixatives for heavy metals is low; When the agent is used for the restoration of heavy metal contaminated sediment, there is secondary pollution; lime-based fixatives usually change the pH of the sediment to make heavy metals form hydroxides and carbonates. After the fixative containing lime components is added to the sediment, It will lead to the hardening and expansion of the bottom mud after restoration, and the fixing effect of the heavy metals in the bottom mud by the hydroxide and carbonate compounds formed after the hydration reaction is easily affected by the external environmental conditions. Weathering and acid rain erosion, where heavy metals are potentially dangerous to be re-dissolved
However, the cost of submicron or nanometer iron is high, and it is easily oxidized by the surrounding medium (such as dissolved oxygen, water), resulting in a decrease in its utilization efficiency; in addition, the transfer of nanometer zero-valent iron in non-porous media is very slow, which further limits its use. Application in sediment remediation

Method used

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Examples

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Effect test

Embodiment 1

[0025] Preparation of Chemical Stabilizer for Remediation of Heavy Metal Contaminated Sediment

[0026] (1) Preparation of solid conditioner: uniformly mix fly ash, phosphogypsum and red mud according to a weight ratio of 48:27:22 to obtain a solid conditioner;

[0027] (2) Preparation of liquid stabilizer: under nitrogen atmosphere and mechanical stirring (rotating speed 400r / min), rhamnolipid solution (2g / L) and FeCl 3 After the solution (0.2mol / L) was fully mixed, it was added dropwise with FeCl 3 solution with an equal volume of NaHB 4 Solution (0.4mol / L) was reacted, and after the bubbles were no longer generated, the reaction was completed, and the rhamnolipid-coated zero-valent nano-iron suspension was obtained, which was sealed and stored at room temperature.

[0028] figure 1 The scanning electron microscope image of the rhamnolipid-coated zero-valent nano-iron suspension prepared for this example, it can be seen from the figure that the zero-valent nano-iron parti...

Embodiment 2

[0038] A method for repairing heavy metal-contaminated bottom mud, comprising the following steps:

[0039] S1: The sediment polluted by heavy metals in a river channel in a non-ferrous mining area in Xianghualing, Linwu County is directly transported to the shore by a cutter suction dredger, and the transported sediment is dehydrated and evenly distributed on the anti-seepage layer ;

[0040] S2: Add the solid conditioner prepared in step (1) into the bottom mud transferred in step S1 and stir and mix, and the addition amount per kilogram of polluted bottom mud is 20%wt;

[0041] S3: After 2 months, the liquid stabilizer prepared in step (2) was sprayed in the heavy metal-contaminated bottom mud, and the amount added per kilogram of the polluted bottom mud was 20%wt. After 6 months of maintenance, most of the heavy metals Pb, Zn, Cu, Cd, and Hg in the original heavy metal-contaminated sediment were reduced to low-priced immobilized heavy metals, indicating that this method h...

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Abstract

The invention discloses a remediation method of heavy metal contaminated bottom sludge. The remediation method includes the steps of firstly, moving out and dewatering the heavy metal contaminated bottom sludge; secondly, using a solid-phase conditioner to condition the contaminated bottom sludge; thirdly, using a liquid-state stabilizer to reduce heavy metal in the contaminated bottom sludge. The remediation method is low in cost, good in effect, high in efficiency, environmentally friendly, and the like.

Description

technical field [0001] The invention relates to the technical field of bottom mud restoration and treatment, in particular to a restoration method for heavy metal polluted bottom mud. Background technique [0002] In industrial areas such as mineral processing, smelting, chemical industry, and electroplating, the wastewater generated by these industries will inevitably be discharged into the surrounding environment, especially the water body. Therefore, heavy metals are the main pollutants in the water body sediment in these areas. Through adsorption, complexation, precipitation, etc., the water phase is transferred to the solid phase, and finally deposited in the sediment and gradually enriched, so that the content of heavy metals in the sediment is often several orders of magnitude higher than that in the water. When the environment changes, the sediment The heavy metals in the mud can easily re-enter the water body, causing secondary pollution, endangering the benthos of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F101/20
CPCC02F11/00C02F11/004C02F2101/20C02F2103/007
Inventor 刘军亮
Owner 沃邦环保有限公司
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