Multistage self-control ex-situ treatment system for screening heavy metal-contaminated sediment

Abstract

The invention relates to a multistage self-control ex-situ treatment system for screening heavy metal-contaminated sediment. The system comprises a regulating tank, a first conditioner, a second conditioner, a third conditioner and a fourth conditioner, wherein the upper part of the first conditioner is provided with a vibrating screen, a conveying slurry pump is arranged between and connected with the regulating tank, three layers of screen meshes are arranged in the vibrating screen from top to bottom, each of the three layers of screen meshes is correspondingly connected with a set of belt conveyor, the upper part of the second conditioner is provided with a spiral sand washing machine which is connected with a fourth set of belt conveyor, the upper parts of the third conditioner and the fourth conditioner are respectively provided with a hydraulic cyclone, the two hydraulic cyclones are respectively connected with a set of belt conveyor, and three conditioners are respectively provided with an agitator, a slurry pump and a particle size analyzer. The system carries out classification and screening on the basis of full consideration of technical implementation difficulty in treatment of heavy metal-contaminated sediment with a great sandstone proportion and combination of physical and chemical properties of the sediment and particle size distribution characteristics and resourceful utilization approaches of heavy metal pollutants in the sediment, and is easy to operate and convenient to implement.

Description

technical field [0001] The invention relates to a system for treating and repairing bottom mud polluted by heavy metals, and belongs to the technical field of bottom mud treatment and restoration. Background technique [0002] Sediment is the surface sediment at the bottom of the water body, which is a mixture of microorganisms, humus, soil and sediment, etc. It is formed by depositing at the bottom of the water body after long-term physical, chemical, biological and water transport. Sediment can reflect the historical process of water body evolution, and is an important part of natural water ecosystems such as rivers, lakes, and tidal flats at river estuaries. [0003] The heavy metals in the sediment come from atmospheric dustfall, precipitation, soil erosion, surface runoff, various sewage, solid waste, and pesticides. They are long-term, cumulative, latent, and irreversible, and can pass through the food chain thousands of times. accumulation, and ultimately endanger hu...

AI Technical Summary

Problems solved by technology

[0010] The present invention aims at the problems that the treatment technology of heavy metal polluted sediments with large proportion of sand and stones (the volume ratio of sand and stones accounts for more than 30%) is not targeted enough, the way of resource utilization is not clear, and the disposal is difficult. The physical and chemical properties (mainly referring to viscosity, mud content and component content of different particle sizes) and the particle size distribution characteristics of heavy metals in the sediment provide a multi-stage self-controlled screening and resource utilization, targeted, reasonable disposal, Multi-stage self-control screening heavy metal polluted sediment ex-situ treatment system with simple operation

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