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...

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Problems solved by technology

However, when it is used to treat heavy metal-contaminated sediment, it still has the disadvantage of poor solidification effect on heavy metals. The possible reason is that the humus content in the sediment is low when the sediment is directly stacked, so the stacking treatment solidifies heavy metals. At the same time, because the heavy metals contained in the sediment are very easy to poison microorganisms, resulting in poor activity of microorganisms, or even death, it is difficult to use microorganisms to degrade organic matter and transform humus during the stacking process, making the stacking system The content of humus in the medium is still low, and it is difficult to effectively fix heavy metals in the sediment through the action of humus. What is more serious is that the biological toxicity of heavy metals in the sediment after leaching treatment is further enhanced, and the original sediment in the sediment Some humus also flows out with the eluate, resulting in a further reduction in the content of humus in the leached sediment, which eventually makes it difficult for heavy metals to pollute the sediment or heavy metals in the leached sediment to be effectively fixed

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