Construction method for carrying out high dehydration on dredging slurry by using swirling flow, condensation, and plate-and-frame

Abstract

The invention relates to a construction method for carrying out high dehydration on a dredging slurry by using swirling flow, condensation, and plate-and-frame, comprising the following steps: conveying dredging slurry with the concentration of 15-20 % into a crude vibrating screen by a conveyer, and screening out large particles and impurities; then separating the slurry by a large-scale cyclone to obtain a downstream slurry and an upstream slurry, letting the downstream slurry pass through the fine vibrating screen to obtain sediments on the screen and a screened condensed slurry, letting the upstream slurry flow into a coagulation sedimentation basin to obtain a condensed slurry and a supernatant; precipitating the screened condensed slurry and the condensed slurry in a mud storage pond, and then hydrating with a plate-and-frame filter press to obtain a mud cake and filter-press tail water; using the sediments on the screen and the mud cake as engineering filling, and processing the supernatant of the sedimentation basin and the filter-press tail water through a tail water processing system to discharge with a standard level. According to the invention, the water content of the low-concentration dredging slurry is reduced gradedly and rapidly, thus the problems that stockyards of a lot of dredging slurry occupy land and the dredging slurry cannot be used directly are effectively solved.

Description

technical field [0001] The invention relates to a high dehydration construction method of dredging mud, which uses the combination of swirling flow, concentration and plate frame, and belongs to the field of resources and environment. Background technique [0002] In recent years, in order to improve the navigation and water supply capacity of inland rivers and improve the water quality of rivers and lakes, many rivers and eutrophic lakes (such as Taihu Lake, Chaohu Lake, Dianchi Lake, etc.) in China are carrying out large-scale dredging projects. At present, the conventional treatment method of domestic dredging silt is mainly to store it in the yard, and after storage, it is treated in situ as land use, or it is used as filling material after various improvements. [0003] Most of the dredging projects in my country use the cutter suction sludge dredging and filling equipment. Due to the limitation of this type of equipment and its conveying process, the concentration of d...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that a large amount of low-concentration dredging mud takes up the storage yard and the tail water of the storage yard pollutes the environment

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