An integrated method and equipment for rapid dehydration, solidification and stabilization of dredged polluted sediment

Abstract

The invention discloses an integrated method and equipment for rapid dehydration, solidification and stabilization of dredged polluted bottom mud, belonging to the field of treatment and resource utilization of dredged polluted bottom mud in rivers, rivers, lakes, seas and ports in environmental engineering. The method comprises: removing slag from the dredged polluted bottom mud, and at the same time, putting the prepared solidifying agent into a medicine storage tank; the solidifying agent is a mixture of blast furnace slag powder and solidifying and stabilizing additive; Bottom sludge and quantitative curing agent are mixed and stirred evenly to obtain mud agent; the evenly stirred mud agent is immediately transported to the dehydration solidification and stabilization treatment tank, and vacuum dehydration is carried out at the same time as the solidification and stabilization reaction until the mud agent is dehydrated and Stable curing. The invention integrates dehydration treatment and solidification stabilization treatment, simplifies the treatment process, improves the treatment efficiency of dredged polluted bottom mud, has lower toxicity and leaching, and is more environmentally friendly and economical.

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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