In-situ cleaning and reusing device for black and odorous river sediments, and method thereof

Abstract

The invention discloses an in-situ cleaning and reusing device for black and odorous river sediments, and a method thereof. The device comprises a submersible pump, the outlet of the submersible pumpis connected with the inlet of an oxidation reaction tank through a dosing pump, the outlet of the oxidation reaction tank is connected with the inlet of a vibrating screening machine, the coarse particle outlet of the vibrating screening machine is connected with the inlet of a coarse particle collecting tank, the mud outlet of the vibrating screening machine is connected with the inlet of a mudtank, the outlet of the mud tank is connected with the inlet of a cyclone separator through a lifting pump and a valve, the medium particle outlet of the cyclone separator is connected with the inletof a medium particle collection tank, the wastewater outlet of the cyclone separator is connected with the inlet of a flocculation reaction tank, the outlet of the flocculation reaction tank is connected with the inlet of a microfiltration machine, and the device treats areas of a river, formed through division using cofferdams, through water distribution pipelines. The method is characterized inthat reduced pollutants in the sediment are removed through the oxidation effect, the cleaned sediments are screened according to different particle sizes, and are respectively covered in the river channel, and wastewater is treated and reused, so the subsequent treatment and disposal cost of the sediments is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection and resource comprehensive utilization, in particular to an in-situ cleaning and recycling device and method for black and odorous river bottom mud. Background technique [0002] Bottom mud is an important link in the material cycle of the river ecosystem. A large amount of organic matter deposited in the bottom mud undergoes anaerobic biodegradation to generate hydrogen sulfide, ammonia, mercaptan and other odorous substances, and at the same time form reduced black substances. Oxygen consumption is one of the important causes of black and odorous river water. At the same time, the release of pollutants such as nutrients in the sediment causes secondary pollution of the water body, leading to accidents, eutrophication, and algal blooms. The endogenous release of river black and odorous sediments largely delays and limits the restoration speed and effect of black and odorous wate...

AI Technical Summary

Problems solved by technology

Ex-situ restoration generally refers to dredging. The sediment containing a large amount of pollutants and pathogenic bacteria is completely removed from the river through excavation or suction operations, and transported to other places for treatment and disposal. However, this method is costly and requires occupancy A large area of ​​land is piled with sediment, and there is no follow-up treatment of the sediment, which will easily lead to the spread of pollution during the process of sediment transfer and stacking; in-situ restoration refers to adding different materials to the river, such as adding gravel and clay Physical materials such as zeolite and zeolite can prevent the transfer of pollutants to the overlying water through physical covering. Physical covering will raise the river bed and reduce the capacity of the water body. It is not suitable for rivers with thick sediment layers.

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