Heavy metal polluted sludge treatment method

Abstract

The invention discloses a heavy metal polluted sludge treatment method which comprises the following steps: conveying heavy metal polluted bottom sludge of rivers, lakes and reservoirs by a slurry pump of a sanddredger ashore; adding heavy metal chelate stabilizer in a first pipeline blender of dredging pipelines; and then adding flocculant in a second pipeline blender; and finally filling sludge in geotextile bags for volume reduction and dehydration; and concreting for 7-50 days after the sludge filling, wherein the sludge treated by the method can be used for land reclamation, greening or landfilling according to different water contents and heavy metal contents. Compared with the prior art, by environmental-protection dredging, transmission by closed pipelines and heavy metal stabilization, the invention completely solves the secondary solution problem of heavy metals; and the invention combines the heavy metal stabilization and a geotextile bag dehydration technology without power consumption without the input of mechanical dehydration equipment, and is suitable for heavy metal polluted sludge treatment in occasions of large treatment area, short work period, small dehydration site, less once investment, low operation cost and the like.

Description

technical field [0001] The invention belongs to the technical field of treating heavy metal-polluted sludge from rivers, lakes, reservoirs, etc., and in particular relates to a treatment method for dredging, dehydration and capacity reduction of heavy-metal-polluted sludge and heavy metal stabilization. Background technique [0002] In recent years, with the improvement of my country's industrial manufacturing and mineral mining and refining capacity, a large amount of heavy metal wastewater and waste residues have been directly discharged into the environment without treatment, making the problem of heavy metal pollution increasingly prominent, especially the heavy metal pollution incident in 2009 Frequent incidents, such as large-scale blood lead excess incidents in Shaanxi, Hunan and other places, heavy metal pollution in the Xiangjiang River made many river sections around it unsuitable for human habitation, etc. For rivers, lakes, reservoirs, etc. polluted by industrial ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a treatment method for heavy metal-contaminated sludge in rivers, lakes, reservoirs, etc., to prevent the sludge from dredging to the greatest extent through environmental protection dredging Secondary pollution caused by disturbance; conveying through closed pipelines to ensure that the dredged sludge will not leak before entering the bag and causing secondary pollution of heavy metals; adding heavy metal chelating stabilizers to ensure that the heavy metals in the sludge are dehydrated before entering the geotextile bag It has been chelated and stabilized before, and will not cause secondary pollution to the surrounding environment; replacing mechanical dehydration with geotextile bag dehydration saves equipment investment and operating costs; the dehydration effect of geotextile bag is strengthened by adding sludge flocculation conditioner, so , this method focuses on solving the problem of secondary pollution of heavy metals in the whole treatment process from dredging to dehydration and volume reduction, high investment and operation costs of mechanical dehydration equipment, low efficiency of direct dehydration with geotextile bags, matching of dredging to dehydration and volume reduction, etc.

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