Treatment method for heavy metal polluted sediment

Abstract

The invention discloses a treatment method for heavy metal polluted sediment. The treatment method comprises the following steps: pumping the polluted sediment into a vibrating screen by a mud pump, carrying out primary sieving on polluted sediment so as to separate gravels and sand grains with the grain diameter being more than 1mm, wherein the dehydrated gravels and sand grains are directly utilized as building materials or filling materials; conveying mud being less than 1mm into a hydraulic cyclone to be further separated; discharging separated mud sand being more than 50 microns into a plate-and-frame filter press to be dehydrated, wherein the dehydrated mud sand is directly utilized as building materials or filling materials; conveying fine slurry being less than 50 microns into a mud preparing tank; conveying prepared mud into a floatation column to be subjected to floating separation; after separation, enriching upwards floating foam on heavy metal, carrying out press filtering and dehydration and conveying the mud into a waste incineration plant or a smelting plant to be treated; and after dehydrating sunk low-pollution clay and fine sand grains, directly conveying the low-pollution clay and the fine sand grains into a municipal solid waste landfill to be landfilled. By adopting the treatment method for the heavy metal polluted sediment, the sediment can be graded and separated, be subjected to volume reduction and quantity reduction treatment and be recycled on site in an efficient and low-cost manner, so that the problems of large treatment amount, high transportation cost and the like in the treatment process of dredging the sediment are effectively solved.

Description

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AI Technical Summary

Benefits of technology

This technology helps reduce the size and weight of suspended solids (SS) from rocks during construction without causing harmful environmental impact on nearby areas. It does this by reducing their concentration while treating them afterwards before being deposited into buildings or other structures. Additionally, it uses specialized techniques like flotage to remove water vapor and create an abundance of heavier metal compounds called slag. By removing these substances, SS becomes less dangerous when they enter soil or groundwater sources due to its lower levels of pollution potential. Overall, this new approach makes efficient use of resources and minimizing handling expenses compared to traditional methods.

Problems solved by technology

Technological Problem addressed in this patents relates to improving the efficiency and economics of treatments involving polluting silt (heavy metallic residue) deposits found around urban areas worldwide. Current techniques involve expensive physical deposition processes like pumpable and static loadings, leading to difficulties in reclaiming them safely and efficiently. Additionally, current approaches require long periods of stability before they may break down into smaller pieces over time.

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