Processing system and processing technology for removing river pollution bottom silt in central urban area

Abstract

The invention discloses a processing system and processing technology for removing river pollution bottom silt in a central urban area. The processing system comprises a multi-functional desilting vessel, a silt storage and transportation vessel and a silt dehydrating and drying vessel, wherein the multi-functional desilting vessel, the silt storage and transportation vessel and the silt dehydrating and drying vessel are communicated through pipelines. The multi-functional desilting vessel comprises a machine body, wheel-type supporting legs, a coarse garbage collection tool / reamer tool arranged at one end of the machine body and a first hydraulic system used for driving the coarse garbage collection tool / reamer tool. The silt storage and transportation vessel comprises a storage and transportation vessel body, positioning piles and a silt cabin, wherein a plurality of stirrers are further arranged in the silt cabin, the silt cabin is connected to the silt dehydrating and drying vessel through a pipeline. The silt dehydrating and drying vessel comprises a dehydrating and drying vessel body, positioning piles, a second hydraulic system, a stirring cabin, a chemical feed device and a drying device. According to the processing technology, a mobile processing station is adopted, all the devices are arranged aboard for operation, and therefore land resources are not occupied. Moreover, a processing method is simple, a processing period is short, the silt processing is thorough, and operability is high.

Description

technical field [0001] The invention relates to a process for treating river channel silt, in particular to a treatment system and process for removing polluted sediment from river channels in central urban areas. Background technique [0002] There are many rivers and lakes in Shanghai with dense water networks. It is a typical tidal river network area with rich water resources, but the hydraulic gradient is gentle, the water flows back and forth, the self-purification ability is poor, the rivers are heavily silted, and the water quality is poor. In the central area, the density of surrounding residents is relatively high. Most of the rivers in the area are tidal channels, and the river water reciprocates with the tide. Some rivers have a prominent sedimentation phenomenon. The sediment contains dozens of heavy metals, organic pollutants and other harmful substances. Great impact on water quality and aquatic ecology. When the temperature is high in summer, the polluted sed...

AI Technical Summary

Problems solved by technology

First of all, during the lifting process of the grab bucket, part of the heavily polluted floating mud and bottom mud will leak back into the river channel along the gap of the grab bucket, so that the polluted bottom mud of the river channel still exists, and harmful substances such as heavy metals still remain. The good soil is dug away by the grab bucket

Secondly, this construction method needs to drain the river and remove the polluted sediment at the bottom of the river. However, such construction conditions are not available in the central urban area. It undertakes the important function of flood control and drainage, and it is impossible to realize the construction without interruption; second, some rivers are surrounded by ecological slope protection, and the surrounding buildings are very close to the river, once the river is drained, it may affect the stability of the buildings; Block stone structure flood control wall, but there are quicksand and other conditions around the river, once the pressure balance between river water and groundwater is damaged, piping may occur, causing serious consequences such as the collapse of the flood control wall

[0004] At present, the methods commonly used in the removal of river polluted sediments in China mainly include "grab dredging + natural drying" and "cutter suction dredging + natural drying of cofferdams". The project implementation is relatively extensive and requires a large area construction site, and it is easy to cause secondary pollution to the soil; while the traditional extensive dredging method is rarely used in foreign countries, and the method of cutter suction dredger + mechanical dehydration is more used

The sludge produced by river cutter suction dredging is in the form of mud, with a water content of about 95%-97%. If it is directly transported, not only the transport volume is huge, but the transport cost will be increased, and the mud water will easily leak during the transport process, which will damage the transport line. adverse impact on the environment

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