Environment-friendly dredged sediment integrated mechanical deep-drying system

Abstract

The invention relates to an environment-friendly dredged sediment integrated mechanical deep-drying system. An input pipeline is communicated with a primary settling unit by a grating unit; the primary settling unit is communicated with a secondary settling unit by an overflow weir; the secondary settling unit is communicated with a first modulating unit by the overflow weir; the first modulating unit enters a tertiary settling unit by a first chemical adding unit; upper-layer residual water in the tertiary settling unit is connected with a residual water purifying unit by a water decanter; and settled mud on the bottom is connected with a mechanical dehydrating unit by a mud pump on the bottom of the tertiary settling unit. By combining dredging engineering practical conditions with dredged sediment at home and abroad, the system disclosed by the invention is integrated with a series of functions such as bottom mud dehydrating, drying, silt-grading, residual water treating, and the like, has characteristics of being less in floor area, great in treatment scale, small in environmental pollution, short in time limit for a project, high in economic benefits, and the like, and effectively solves difficulty in the conventional dredge yard.

Description

technical field [0001] The invention belongs to the field of dredging engineering of inland rivers and lakes, and relates to a dredging bottom mud drying treatment technology, in particular to an environment-friendly integrated mechanical deep drying system for dredging bottom mud. Background technique [0002] In the environmental protection dredging projects of rivers and lakes in my country, the lakes that need environmental protection dredging are often located in the key areas of the city, and the land around the lakes that can be used for dredging construction is less and less, resulting in the difficulty of land acquisition for the polluted sediment dump after dredging, which greatly increases the number of lakes. The difficulty and cost of water environment governance. So far, almost all environmental protection dredging projects of urban water bodies have been troubled and restricted by the storage yard problem to varying degrees. Therefore, how to get rid of the pr...

AI Technical Summary

Problems solved by technology

[0006] 2. Advantages and disadvantages of geotube bag dehydration method

Its advantage is that it does not require large-scale equipment and plant investment, and is convenient for construction. Its disadvantage is that for non-sandy bottom mud (inland river and lake dredging bottom mud and municipal silt are mostly non-sandy mud), there may be "mud cores", that is, close to The mud in the pipe bag has hardened after dehydration, but the central part of the pipe bag is still muddy

[0008] 3. Advantages and disadvantages of the active drainage method of the yard

Since a large amount of chemical curing agent is introduced into the bottom mud, the physical properties of soil particles are changed from the molecular structure. The disadvantage is that the treated bottom mud can only be used as engineering soil, and the pH of the remaining water produced by this technical solution is alkaline. Need to use a large amount of acidic substances, such as hydrochloric acid to neutralize, there is secondary pollution

Therefore, based on this, the technology is currently quite controversial in the field of environmental protection.

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