Interlock-controlled sediment eluting and screening system and eluting and screening method thereof

Abstract

The invention discloses an interlock-controlled sediment eluting and screening system and an eluting and screening method thereof. The system comprises an eluting device, a screening device and a variable-frequency spraying pipeline, wherein the eluting device comprises a eluting roller, a material transmitting device and a speed control driving device, the eluting roller is connected with the speed control driving device, and the material transmitting device is arranged in the eluting roller; the screening device is connected to an outlet end of the eluting roller; the variable-frequency spraying pipeline is arranged in the eluting device. The eluting and screening method comprises the steps as follows: (1) sediment is scattered and fed; (2) the sediment is eluted; (3) the sediment is screened; (4) the eluting roller rotates reversely and the material stirring and eluting time is prolonged; (5) chemical eluting is started and performed through the variable-frequency spraying pipeline,or chemical eluting and clear water eluting are performed alternately. Accurate eluting is realized, energy consumption is reduced, blockage of screen meshes is effectively avoided, and the eluting efficiency is improved; eluting and separation of sediment components with different particle sizes and heavy metal content are realized, and classified treatment of the sediment is realized.

Description

technical field [0001] The invention relates to a leaching system used for treatment and restoration of bottom mud polluted by heavy metals, nutrient elements, refractory organic matter, etc., and belongs to the technical field of leaching. Background technique [0002] At present, countries around the world have different control plans and technical solutions for heavy metal pollution in sediments. Especially in my country, affected by factors such as pollution and economic regionality, the conditions for comprehensive heavy metal pollution control in sediments are not yet available. According to the degree of pollution of the polluted water body, combined with the implementation conditions of the polluted site, the commonly used remediation technologies for heavy metal-contaminated sediments are mainly divided into in-situ treatment technology and ex-situ treatment technology. [0003] The in-situ remediation technology mainly includes in-situ phytoremediation and in-situ ...

AI Technical Summary

Problems solved by technology

Although the system fully considers the difficulty of technical implementation of heavy metal-contaminated sediments with a large proportion of sand and gravel, and combines the physical and chemical characteristics of sediments, the particle size distribution characteristics of heavy metal pollutants in sediments, and resource utilization methods, the classification and screening are carried out. However, the hydrological conditions of seasonal rivers and the characteristics of low water content and large sand and gravel content in the dredged sediment of seasonal river projects, especially the adhesion of large and small particles and many sticky lumps, have not been fully considered.

[0009] CN101921090A discloses "Seasonal River Heavy Metal Polluted Sediment Dredging and Dislocation Treatment Method and System", although considering the characteristics of low water content and large sand and gravel content in the dredged sediment of seasonal river engineering, a drum stone washing machine and a spiral Sand washing machine, but the description of its specific structure and application is not clear. It is only mentioned that when the pebbles (particle size > 4.75mm) contained in it are large (mass fraction greater than 10%), it will be transported to The drum stone washing machine uses river water leaching and chemical leaching to wash the sediment, but the structure, function and operation method of the drum stone washing machine and spiral sand washing machine have not been designed. , the leaching intensity is limited to the leaching capacity of the equipment itself. When the river water leaching cannot meet the requirements, chemical leaching is used directly, which increases the economic burden on the eluent treatment, and also increases the possibility of the eluent polluting adjacent river water. possibility

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