Method for repairing heavy metal polluted bottom mud through combination of leaching and stacking

Abstract

The invention discloses a method for jointly repairing heavy metal polluted bottom mud by utilizing leaching and stacking, which comprises the following steps: mixing the heavy metal polluted bottom mud with straws, leaching the obtained mixed material by adopting an EDTA-2Na (Ethylene Diamine Tetraacetic Acid) solution, and then carrying out aerobic stacking treatment to finish the repairing of the heavy metal polluted bottom mud. According to the method for repairing the heavy metal polluted bottom mud through combination of leaching and stacking, the EDTA-2Na solution serves as a leaching agent, aerobic stacking continues to be conducted on the bottom mud after leaching treatment is conducted, heavy metal in the bottom mud can be effectively removed, meanwhile, all residual heavy metal in the bottom mud can be effectively fixed, and the effect that the heavy metal in the bottom mud is effectively removed is achieved. The method has the advantages of being simple in process, convenient to operate, low in cost, good in heavy metal removal effect, good in heavy metal immobilization effect, free of secondary pollution and the like, and has very important significance on achieving harmless treatment and resource utilization of the heavy metal polluted bottom mud.

Description

technical field

[0001] The invention belongs to the field of remediation of heavy metal pollution in bottom mud in environmental engineering, and in particular relates to a method for jointly repairing heavy metal polluted bottom mud by leaching and stacking. Background technique

[0002] With the development of industrialization and the increase of human activities, a large amount of industrial wastewater containing heavy metals is discharged into the ecological environment due to improper disposal, causing serious environmental problems. After heavy metals enter the water body, they are easily deposited in the river sediment through complexation, adsorption, ion exchange and co-precipitation. Heavy metals are common harmful pollutants with characteristics of persistence, difficulty in biodegradation, high biotoxicity and potential bioaccumulation. Heavy metals in river sediments can pose risks to aquatic organisms and human health through the food chain. Therefore, the p...

Examples

Embodiment 1

[0037] A method for combined restoration of heavy metal-contaminated sediment by leaching and stacking, such as figure 1 shown, including the following steps:

[0038] S1. Collect the surface sediment of the Changsha section of the Xiangjiang River, air-dry it at room temperature, remove impurities, grind and crush it, and pass through a 10-mesh sieve to obtain sediment with a particle size ≤ 2 cm. The rice straw (commercially purchased) is air-dried and ground (cut) to a length of 10-20 mm. The basic physical and chemical properties and heavy metal content of the sediment and rice straw are shown in Table 1.

[0039] Table 1 Basic physical and chemical properties of sediment and rice straw

[0040]

technical field

[0001] The invention belongs to the field of remediation of heavy metal pollution in bottom mud in environmental engineering, and in particular relates to a method for jointly repairing heavy metal polluted bottom mud by leaching and stacking. Background technique

[0002] With the development of industrialization and the increase of human activities, a large amount of industrial wastewater containing heavy metals is discharged into the ecological environment due to improper disposal, causing serious environmental problems. After heavy metals enter the water body, they are easily deposited in the river sediment through complexation, adsorption, ion exchange and co-precipitation. Heavy metals are common harmful pollutants with characteristics of persistence, difficulty in biodegradation, high biotoxicity and potential bioaccumulation. Heavy metals in river sediments can pose risks to aquatic organisms and human health through the food chain. Therefore, the p...

Examples

Embodiment 1

[0037] A method for combined restoration of heavy metal-contaminated sediment by leaching and stacking, such as figure 1 shown, including the following steps:

[0038] S1. Collect the surface sediment of the Changsha section of the Xiangjiang River, air-dry it at room temperature, remove impurities, grind and crush it, and pass through a 10-mesh sieve to obtain sediment with a particle size ≤ 2 cm. The rice straw (commercially purchased) is air-dried and ground (cut) to a length of 10-20 mm. The basic physical and chemical properties and heavy metal content of the sediment and rice straw are shown in Table 1.

[0039] Table 1 Basic physical and chemical properties of sediment and rice straw

[0040]

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