Underwater bottom mud closed dredging device and method

Abstract

The invention discloses an underwater bottom mud closed dredging device. The device comprises a cylindrical dredging bin. The dredging bin is open in the bottom and is inserted into the underwater bottom mud. The top of the dredging bin is provided with a sealed top cover. A hole is formed on the top cover. The top cover is connected with a pipe. The mouth of the pipe is above water surface. The center of the dredging bin is provided with a circular mud collecting pond surrounded by coaming. The top of the mud collecting pond is communicated with the pipe. A mud conveying device is arranged inthe pipe. A plurality of fan grooves separated by slotting plates are arranged on the outside of the mud collecting pond. A communicated collecting port is arranged between the mud collecting pond and the fan grooves. Each fan groove is provided with a mud scraper. The mud scraper moves along the radial direction to scrape the mud into the mud collecting pond, and sends the bottom mud into the mud collecting pond through the collecting port. The mud conveying device in the pipe transports the mud from the mud collecting pond to a mud collection device on the surface of water. The invention further provides an underwater bottom mud closed dredging method. The device effectively prevents the secondary pollution of water body in the dredging process.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and relates to a dredging device and method for polluted sediment at the bottom of rivers, lakes, reservoirs, etc., in particular to a closed dredging device and method for underwater sediment. Background technique [0002] At present, as the sediments of rivers, lakes and seas, bottom mud is an important part of natural waters. However, when the water body is polluted, some pollutants in the water can be accumulated in the bottom mud through adsorption on particles or self-precipitation, becoming Contaminated sediment. Contaminated sediment is a potential source of pollution for lakes. When the lake environment changes, the nutrients in the sediment may be re-released, causing secondary pollution. Studies have shown that when the external pollution sources of the lake are controlled, the sediment can become the primary pollution source, and its seasonal nutrient release c...

AI Technical Summary

Problems solved by technology

[0003] At present, the main tool for sediment dredging is the modern dredger, which may lead to the resuspension of the polluted sediment during the dredging process, the decrease of the transparency of the water body, and the diffusion of high-concentration organic matter in the sediment and interstitial water, resulting in secondary pollution. pollution and other issues

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