Dredged polluted bottom sludge rapid dehydration solidification stabilization integrated method and equipment

Abstract

The invention discloses a dredged polluted bottom sludge rapid dehydration solidification stabilization integrated method and equipment, and belongs to the field of river, lake, sea, harbour dredged polluted bottom sludge processing and resource utilization in environment engineering. The dredged polluted bottom sludge rapid dehydration solidification stabilization integrated method comprises following steps: dredged polluted bottom sludge is subjected to slag removing treatment, and at the same time, a prepared curing agent is introduced into a medicine storage tank, wherein the curing agentis a mixture of blast furnace slag powder and a solidification stabilization additive; after slag removing, the dredged polluted bottom sludge and a certain amount of the curing agent are mixed and stirred to be uniform so as to obtain a sludge preparation; the uniformly stirred sludge preparation is introduced into a dehydration solidification stabilization pool immediately, solidification stabilization reaction and vacuum dehydration treatment are carried out at the same time until sludge preparation dehydration and solidification stabilization are realized. The dredged polluted bottom sludge rapid dehydration solidification stabilization integrated method is capable of realizing integrated dehydration and solidification stabilization, processing technology is simplified, and at the sametime, dredged polluted bottom sludge processing efficiency is increased, toxicity leaching is lower, and the method is more friendly to the environment and better in economical benefit.

Description

technical field [0001] The invention belongs to the field of treatment, disposal and resource utilization of dredged polluted sediment in rivers, rivers, lakes, seas and ports in environmental engineering, and more specifically relates to an integrated technical method and equipment for dehydration, solidification and stabilization of dredged polluted sediment. Background technique [0002] With the progress of economy and society, the rapid development of urban industry, and the aggravation of human activities, the water environment of rivers and lakes is not optimistic, and it has generally become a gathering place for various sewage, causing serious pollution and siltation of rivers and lakes, and greatly reducing the pollution of rivers and lakes. The dilution and purification and scouring and silting capabilities of the environment lead to the decline and deterioration of the overall quality of the ecological environment of rivers and lakes, and also have adverse effects...

AI Technical Summary

Problems solved by technology

However, the polluted sediment excavated by dredging usually has the characteristics of high moisture content, low strength and easy toxicity leaching, and cannot be directly used for landfill, stockpiling or resource utilization, and further treatment is required

[0004] At present, the treatment of this kind of dredged polluted sediment mainly adopts the method of first dehydration and then solidification and stabilization treatment. Among them, the dehydration treatment mainly uses equipment such as filter press or centrifuge, but these equipment are often very expensive and cost a lot. Increased the treatment cost of dredged sediment; solidification and stabilization treatment is to fully stir the dehydrated contaminated sediment with a certain amount of solidifying agent, and use physical or chemical methods to convert the sediment into solids and reduce the pollution in the sediment. effectively passivate, digest or immobilize pollutants, thereby reducing the mobility and bioavailability of pollutants in the sediment

[0005] At present, the commonly used curing agents are mainly cement, lime and other cementitious materials, but the cost of such materials is high and the applicability is poor. At the same time, the materials will consume a lot of mineral raw materials and energy during the production process, and will also produce dust, toxic gases, etc. A series of pollutants, which will cause waste of non-renewable resources and pollution of the ecological environment

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